Messages in this thread Patch in this message |  | | Date | Wed, 16 Oct 2013 20:38:18 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 6/6] percpu: Add preemption checks to __this_cpu ops |
| |
On Wed, Oct 16, 2013 at 06:25:37PM +0200, Peter Zijlstra wrote: > To rename __this_cpu to raw_cpu; it would then need a little manual > fixup and generic __this_cpu -> raW_cpu map, which can add the > preemption check.
Something like so perhaps... only lightly compile tested (x86_64-defconfig).
--- arch/x86/include/asm/percpu.h | 108 ++++++------ arch/x86/include/asm/preempt.h | 16 +- include/asm-generic/percpu.h | 15 +- include/linux/percpu.h | 385 +++++++++++++++++++++++++---------------- lib/smp_processor_id.c | 19 +- 5 files changed, 319 insertions(+), 224 deletions(-)
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h index 0da5200..a053103 100644 --- a/arch/x86/include/asm/percpu.h +++ b/arch/x86/include/asm/percpu.h @@ -52,7 +52,7 @@ * Compared to the generic __my_cpu_offset version, the following * saves one instruction and avoids clobbering a temp register. */ -#define __this_cpu_ptr(ptr) \ +#define raw_cpu_ptr(ptr) \ ({ \ unsigned long tcp_ptr__; \ __verify_pcpu_ptr(ptr); \ @@ -361,28 +361,28 @@ do { \ */ #define this_cpu_read_stable(var) percpu_from_op("mov", var, "p" (&(var))) -#define __this_cpu_read_1(pcp) percpu_from_op("mov", (pcp), "m"(pcp)) -#define __this_cpu_read_2(pcp) percpu_from_op("mov", (pcp), "m"(pcp)) -#define __this_cpu_read_4(pcp) percpu_from_op("mov", (pcp), "m"(pcp)) - -#define __this_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val) -#define __this_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val) -#define __this_cpu_write_4(pcp, val) percpu_to_op("mov", (pcp), val) -#define __this_cpu_add_1(pcp, val) percpu_add_op((pcp), val) -#define __this_cpu_add_2(pcp, val) percpu_add_op((pcp), val) -#define __this_cpu_add_4(pcp, val) percpu_add_op((pcp), val) -#define __this_cpu_and_1(pcp, val) percpu_to_op("and", (pcp), val) -#define __this_cpu_and_2(pcp, val) percpu_to_op("and", (pcp), val) -#define __this_cpu_and_4(pcp, val) percpu_to_op("and", (pcp), val) -#define __this_cpu_or_1(pcp, val) percpu_to_op("or", (pcp), val) -#define __this_cpu_or_2(pcp, val) percpu_to_op("or", (pcp), val) -#define __this_cpu_or_4(pcp, val) percpu_to_op("or", (pcp), val) -#define __this_cpu_xor_1(pcp, val) percpu_to_op("xor", (pcp), val) -#define __this_cpu_xor_2(pcp, val) percpu_to_op("xor", (pcp), val) -#define __this_cpu_xor_4(pcp, val) percpu_to_op("xor", (pcp), val) -#define __this_cpu_xchg_1(pcp, val) percpu_xchg_op(pcp, val) -#define __this_cpu_xchg_2(pcp, val) percpu_xchg_op(pcp, val) -#define __this_cpu_xchg_4(pcp, val) percpu_xchg_op(pcp, val) +#define raw_cpu_read_1(pcp) percpu_from_op("mov", (pcp), "m"(pcp)) +#define raw_cpu_read_2(pcp) percpu_from_op("mov", (pcp), "m"(pcp)) +#define raw_cpu_read_4(pcp) percpu_from_op("mov", (pcp), "m"(pcp)) + +#define raw_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val) +#define raw_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val) +#define raw_cpu_write_4(pcp, val) percpu_to_op("mov", (pcp), val) +#define raw_cpu_add_1(pcp, val) percpu_add_op((pcp), val) +#define raw_cpu_add_2(pcp, val) percpu_add_op((pcp), val) +#define raw_cpu_add_4(pcp, val) percpu_add_op((pcp), val) +#define raw_cpu_and_1(pcp, val) percpu_to_op("and", (pcp), val) +#define raw_cpu_and_2(pcp, val) percpu_to_op("and", (pcp), val) +#define raw_cpu_and_4(pcp, val) percpu_to_op("and", (pcp), val) +#define raw_cpu_or_1(pcp, val) percpu_to_op("or", (pcp), val) +#define raw_cpu_or_2(pcp, val) percpu_to_op("or", (pcp), val) +#define raw_cpu_or_4(pcp, val) percpu_to_op("or", (pcp), val) +#define raw_cpu_xor_1(pcp, val) percpu_to_op("xor", (pcp), val) +#define raw_cpu_xor_2(pcp, val) percpu_to_op("xor", (pcp), val) +#define raw_cpu_xor_4(pcp, val) percpu_to_op("xor", (pcp), val) +#define raw_cpu_xchg_1(pcp, val) percpu_xchg_op(pcp, val) +#define raw_cpu_xchg_2(pcp, val) percpu_xchg_op(pcp, val) +#define raw_cpu_xchg_4(pcp, val) percpu_xchg_op(pcp, val) #define this_cpu_read_1(pcp) percpu_from_op("mov", (pcp), "m"(pcp)) #define this_cpu_read_2(pcp) percpu_from_op("mov", (pcp), "m"(pcp)) @@ -406,16 +406,16 @@ do { \ #define this_cpu_xchg_2(pcp, nval) percpu_xchg_op(pcp, nval) #define this_cpu_xchg_4(pcp, nval) percpu_xchg_op(pcp, nval) -#define __this_cpu_add_return_1(pcp, val) percpu_add_return_op(pcp, val) -#define __this_cpu_add_return_2(pcp, val) percpu_add_return_op(pcp, val) -#define __this_cpu_add_return_4(pcp, val) percpu_add_return_op(pcp, val) -#define __this_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) -#define __this_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) -#define __this_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) +#define raw_cpu_add_return_1(pcp, val) percpu_add_return_op(pcp, val) +#define raw_cpu_add_return_2(pcp, val) percpu_add_return_op(pcp, val) +#define raw_cpu_add_return_4(pcp, val) percpu_add_return_op(pcp, val) +#define raw_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) +#define raw_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) +#define raw_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) -#define this_cpu_add_return_1(pcp, val) percpu_add_return_op(pcp, val) -#define this_cpu_add_return_2(pcp, val) percpu_add_return_op(pcp, val) -#define this_cpu_add_return_4(pcp, val) percpu_add_return_op(pcp, val) +#define this_cpu_add_return_1(pcp, val) percpu_add_return_op(pcp, val) +#define this_cpu_add_return_2(pcp, val) percpu_add_return_op(pcp, val) +#define this_cpu_add_return_4(pcp, val) percpu_add_return_op(pcp, val) #define this_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) #define this_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) #define this_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) @@ -432,7 +432,7 @@ do { \ __ret; \ }) -#define __this_cpu_cmpxchg_double_4 percpu_cmpxchg8b_double +#define raw_cpu_cmpxchg_double_4 percpu_cmpxchg8b_double #define this_cpu_cmpxchg_double_4 percpu_cmpxchg8b_double #endif /* CONFIG_X86_CMPXCHG64 */ @@ -441,24 +441,24 @@ do { \ * 32 bit must fall back to generic operations. */ #ifdef CONFIG_X86_64 -#define __this_cpu_read_8(pcp) percpu_from_op("mov", (pcp), "m"(pcp)) -#define __this_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val) -#define __this_cpu_add_8(pcp, val) percpu_add_op((pcp), val) -#define __this_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val) -#define __this_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val) -#define __this_cpu_xor_8(pcp, val) percpu_to_op("xor", (pcp), val) -#define __this_cpu_add_return_8(pcp, val) percpu_add_return_op(pcp, val) -#define __this_cpu_xchg_8(pcp, nval) percpu_xchg_op(pcp, nval) -#define __this_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) - -#define this_cpu_read_8(pcp) percpu_from_op("mov", (pcp), "m"(pcp)) -#define this_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val) -#define this_cpu_add_8(pcp, val) percpu_add_op((pcp), val) -#define this_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val) -#define this_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val) -#define this_cpu_xor_8(pcp, val) percpu_to_op("xor", (pcp), val) -#define this_cpu_add_return_8(pcp, val) percpu_add_return_op(pcp, val) -#define this_cpu_xchg_8(pcp, nval) percpu_xchg_op(pcp, nval) +#define raw_cpu_read_8(pcp) percpu_from_op("mov", (pcp), "m"(pcp)) +#define raw_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val) +#define raw_cpu_add_8(pcp, val) percpu_add_op((pcp), val) +#define raw_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val) +#define raw_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val) +#define raw_cpu_xor_8(pcp, val) percpu_to_op("xor", (pcp), val) +#define raw_cpu_add_return_8(pcp, val) percpu_add_return_op(pcp, val) +#define raw_cpu_xchg_8(pcp, nval) percpu_xchg_op(pcp, nval) +#define raw_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) + +#define this_cpu_read_8(pcp) percpu_from_op("mov", (pcp), "m"(pcp)) +#define this_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val) +#define this_cpu_add_8(pcp, val) percpu_add_op((pcp), val) +#define this_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val) +#define this_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val) +#define this_cpu_xor_8(pcp, val) percpu_to_op("xor", (pcp), val) +#define this_cpu_add_return_8(pcp, val) percpu_add_return_op(pcp, val) +#define this_cpu_xchg_8(pcp, nval) percpu_xchg_op(pcp, nval) #define this_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) /* @@ -481,7 +481,7 @@ do { \ __ret; \ }) -#define __this_cpu_cmpxchg_double_8 percpu_cmpxchg16b_double +#define raw_cpu_cmpxchg_double_8 percpu_cmpxchg16b_double #define this_cpu_cmpxchg_double_8 percpu_cmpxchg16b_double #endif @@ -502,9 +502,9 @@ static __always_inline int x86_this_cpu_constant_test_bit(unsigned int nr, unsigned long __percpu *a = (unsigned long *)addr + nr / BITS_PER_LONG; #ifdef CONFIG_X86_64 - return ((1UL << (nr % BITS_PER_LONG)) & __this_cpu_read_8(*a)) != 0; + return ((1UL << (nr % BITS_PER_LONG)) & raw_cpu_read_8(*a)) != 0; #else - return ((1UL << (nr % BITS_PER_LONG)) & __this_cpu_read_4(*a)) != 0; + return ((1UL << (nr % BITS_PER_LONG)) & raw_cpu_read_4(*a)) != 0; #endif } diff --git a/arch/x86/include/asm/preempt.h b/arch/x86/include/asm/preempt.h index 8729723..95e3532 100644 --- a/arch/x86/include/asm/preempt.h +++ b/arch/x86/include/asm/preempt.h @@ -13,12 +13,12 @@ DECLARE_PER_CPU(int, __preempt_count); */ static __always_inline int preempt_count(void) { - return __this_cpu_read_4(__preempt_count) & ~PREEMPT_NEED_RESCHED; + return raw_cpu_read_4(__preempt_count) & ~PREEMPT_NEED_RESCHED; } static __always_inline void preempt_count_set(int pc) { - __this_cpu_write_4(__preempt_count, pc); + raw_cpu_write_4(__preempt_count, pc); } /* @@ -47,17 +47,17 @@ static __always_inline void preempt_count_set(int pc) static __always_inline void set_preempt_need_resched(void) { - __this_cpu_and_4(__preempt_count, ~PREEMPT_NEED_RESCHED); + raw_cpu_and_4(__preempt_count, ~PREEMPT_NEED_RESCHED); } static __always_inline void clear_preempt_need_resched(void) { - __this_cpu_or_4(__preempt_count, PREEMPT_NEED_RESCHED); + raw_cpu_or_4(__preempt_count, PREEMPT_NEED_RESCHED); } static __always_inline bool test_preempt_need_resched(void) { - return !(__this_cpu_read_4(__preempt_count) & PREEMPT_NEED_RESCHED); + return !(raw_cpu_read_4(__preempt_count) & PREEMPT_NEED_RESCHED); } /* @@ -66,12 +66,12 @@ static __always_inline bool test_preempt_need_resched(void) static __always_inline void __preempt_count_add(int val) { - __this_cpu_add_4(__preempt_count, val); + raw_cpu_add_4(__preempt_count, val); } static __always_inline void __preempt_count_sub(int val) { - __this_cpu_add_4(__preempt_count, -val); + raw_cpu_add_4(__preempt_count, -val); } static __always_inline bool __preempt_count_dec_and_test(void) @@ -84,7 +84,7 @@ static __always_inline bool __preempt_count_dec_and_test(void) */ static __always_inline bool should_resched(void) { - return unlikely(!__this_cpu_read_4(__preempt_count)); + return unlikely(!raw_cpu_read_4(__preempt_count)); } #ifdef CONFIG_PREEMPT diff --git a/include/asm-generic/percpu.h b/include/asm-generic/percpu.h index d17784e..b5aca54 100644 --- a/include/asm-generic/percpu.h +++ b/include/asm-generic/percpu.h @@ -56,17 +56,18 @@ extern unsigned long __per_cpu_offset[NR_CPUS]; #define per_cpu(var, cpu) \ (*SHIFT_PERCPU_PTR(&(var), per_cpu_offset(cpu))) -#ifndef __this_cpu_ptr -#define __this_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset) +#ifndef raw_cpu_ptr +#define raw_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset) #endif + #ifdef CONFIG_DEBUG_PREEMPT #define this_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, my_cpu_offset) #else -#define this_cpu_ptr(ptr) __this_cpu_ptr(ptr) +#define this_cpu_ptr(ptr) raw_cpu_ptr(ptr) #endif -#define __get_cpu_var(var) (*this_cpu_ptr(&(var))) -#define __raw_get_cpu_var(var) (*__this_cpu_ptr(&(var))) +#define __get_cpu_var(var) (*this_cpu_ptr(&(var))) +#define __raw_get_cpu_var(var) (*raw_cpu_ptr(&(var))) #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA extern void setup_per_cpu_areas(void); @@ -83,10 +84,12 @@ extern void setup_per_cpu_areas(void); #define __get_cpu_var(var) (*VERIFY_PERCPU_PTR(&(var))) #define __raw_get_cpu_var(var) (*VERIFY_PERCPU_PTR(&(var))) #define this_cpu_ptr(ptr) per_cpu_ptr(ptr, 0) -#define __this_cpu_ptr(ptr) this_cpu_ptr(ptr) +#define raw_cpu_ptr(ptr) this_cpu_ptr(ptr) #endif /* SMP */ +#define __this_cpu_ptr(ptr) this_cpu_ptr(ptr) + #ifndef PER_CPU_BASE_SECTION #ifdef CONFIG_SMP #define PER_CPU_BASE_SECTION ".data..percpu" diff --git a/include/linux/percpu.h b/include/linux/percpu.h index cc88172..b88f03f 100644 --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -295,7 +295,7 @@ do { \ do { \ unsigned long flags; \ raw_local_irq_save(flags); \ - *__this_cpu_ptr(&(pcp)) op val; \ + *raw_cpu_ptr(&(pcp)) op val; \ raw_local_irq_restore(flags); \ } while (0) @@ -396,8 +396,8 @@ do { \ typeof(pcp) ret__; \ unsigned long flags; \ raw_local_irq_save(flags); \ - __this_cpu_add(pcp, val); \ - ret__ = __this_cpu_read(pcp); \ + raw_cpu_add(pcp, val); \ + ret__ = raw_cpu_read(pcp); \ raw_local_irq_restore(flags); \ ret__; \ }) @@ -426,8 +426,8 @@ do { \ ({ typeof(pcp) ret__; \ unsigned long flags; \ raw_local_irq_save(flags); \ - ret__ = __this_cpu_read(pcp); \ - __this_cpu_write(pcp, nval); \ + ret__ = raw_cpu_read(pcp); \ + raw_cpu_write(pcp, nval); \ raw_local_irq_restore(flags); \ ret__; \ }) @@ -454,9 +454,9 @@ do { \ typeof(pcp) ret__; \ unsigned long flags; \ raw_local_irq_save(flags); \ - ret__ = __this_cpu_read(pcp); \ + ret__ = raw_cpu_read(pcp); \ if (ret__ == (oval)) \ - __this_cpu_write(pcp, nval); \ + raw_cpu_write(pcp, nval); \ raw_local_irq_restore(flags); \ ret__; \ }) @@ -491,7 +491,7 @@ do { \ int ret__; \ unsigned long flags; \ raw_local_irq_save(flags); \ - ret__ = __this_cpu_generic_cmpxchg_double(pcp1, pcp2, \ + ret__ = raw_cpu_generic_cmpxchg_double(pcp1, pcp2, \ oval1, oval2, nval1, nval2); \ raw_local_irq_restore(flags); \ ret__; \ @@ -519,240 +519,321 @@ do { \ #endif /* - * Generic percpu operations for context that are safe from preemption/interrupts. - * Either we do not care about races or the caller has the - * responsibility of handling preemption/interrupt issues. Arch code can still - * override these instructions since the arch per cpu code may be more - * efficient and may actually get race freeness for free (that is the - * case for x86 for example). + * Generic percpu operations for context where we do not want to do any checks + * for preemptiosn. + * + * If there is no other protection through preempt disable and/or disabling + * interupts then one of these RMW operations can show unexpected behavior + * because the execution thread was rescheduled on another processor or an + * interrupt occurred and the same percpu variable was modified from the + * interrupt context. * - * If there is no other protection through preempt disable and/or - * disabling interupts then one of these RMW operations can show unexpected - * behavior because the execution thread was rescheduled on another processor - * or an interrupt occurred and the same percpu variable was modified from - * the interrupt context. + * Use with care! */ -#ifndef __this_cpu_read -# ifndef __this_cpu_read_1 -# define __this_cpu_read_1(pcp) (*__this_cpu_ptr(&(pcp))) +#ifndef raw_cpu_read +# ifndef raw_cpu_read_1 +# define raw_cpu_read_1(pcp) (*raw_cpu_ptr(&(pcp))) # endif -# ifndef __this_cpu_read_2 -# define __this_cpu_read_2(pcp) (*__this_cpu_ptr(&(pcp))) +# ifndef raw_cpu_read_2 +# define raw_cpu_read_2(pcp) (*raw_cpu_ptr(&(pcp))) # endif -# ifndef __this_cpu_read_4 -# define __this_cpu_read_4(pcp) (*__this_cpu_ptr(&(pcp))) +# ifndef raw_cpu_read_4 +# define raw_cpu_read_4(pcp) (*raw_cpu_ptr(&(pcp))) # endif -# ifndef __this_cpu_read_8 -# define __this_cpu_read_8(pcp) (*__this_cpu_ptr(&(pcp))) +# ifndef raw_cpu_read_8 +# define raw_cpu_read_8(pcp) (*raw_cpu_ptr(&(pcp))) # endif -# define __this_cpu_read(pcp) __pcpu_size_call_return(__this_cpu_read_, (pcp)) +# define raw_cpu_read(pcp) __pcpu_size_call_return(raw_cpu_read_, (pcp)) #endif -#define __this_cpu_generic_to_op(pcp, val, op) \ +#define raw_cpu_generic_to_op(pcp, val, op) \ do { \ - *__this_cpu_ptr(&(pcp)) op val; \ + *raw_cpu_ptr(&(pcp)) op val; \ } while (0) -#ifndef __this_cpu_write -# ifndef __this_cpu_write_1 -# define __this_cpu_write_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) +#ifndef raw_cpu_write +# ifndef raw_cpu_write_1 +# define raw_cpu_write_1(pcp, val) raw_cpu_generic_to_op((pcp), (val), =) # endif -# ifndef __this_cpu_write_2 -# define __this_cpu_write_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) +# ifndef raw_cpu_write_2 +# define raw_cpu_write_2(pcp, val) raw_cpu_generic_to_op((pcp), (val), =) # endif -# ifndef __this_cpu_write_4 -# define __this_cpu_write_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) +# ifndef raw_cpu_write_4 +# define raw_cpu_write_4(pcp, val) raw_cpu_generic_to_op((pcp), (val), =) # endif -# ifndef __this_cpu_write_8 -# define __this_cpu_write_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) +# ifndef raw_cpu_write_8 +# define raw_cpu_write_8(pcp, val) raw_cpu_generic_to_op((pcp), (val), =) # endif -# define __this_cpu_write(pcp, val) __pcpu_size_call(__this_cpu_write_, (pcp), (val)) +# define raw_cpu_write(pcp, val) __pcpu_size_call(raw_cpu_write_, (pcp), (val)) #endif -#ifndef __this_cpu_add -# ifndef __this_cpu_add_1 -# define __this_cpu_add_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) +#ifndef raw_cpu_add +# ifndef raw_cpu_add_1 +# define raw_cpu_add_1(pcp, val) raw_cpu_generic_to_op((pcp), (val), +=) # endif -# ifndef __this_cpu_add_2 -# define __this_cpu_add_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) +# ifndef raw_cpu_add_2 +# define raw_cpu_add_2(pcp, val) raw_cpu_generic_to_op((pcp), (val), +=) # endif -# ifndef __this_cpu_add_4 -# define __this_cpu_add_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) +# ifndef raw_cpu_add_4 +# define raw_cpu_add_4(pcp, val) raw_cpu_generic_to_op((pcp), (val), +=) # endif -# ifndef __this_cpu_add_8 -# define __this_cpu_add_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) +# ifndef raw_cpu_add_8 +# define raw_cpu_add_8(pcp, val) raw_cpu_generic_to_op((pcp), (val), +=) # endif -# define __this_cpu_add(pcp, val) __pcpu_size_call(__this_cpu_add_, (pcp), (val)) +# define raw_cpu_add(pcp, val) __pcpu_size_call(raw_cpu_add_, (pcp), (val)) #endif -#ifndef __this_cpu_sub -# define __this_cpu_sub(pcp, val) __this_cpu_add((pcp), -(val)) +#ifndef raw_cpu_sub +# define raw_cpu_sub(pcp, val) raw_cpu_add((pcp), -(val)) #endif -#ifndef __this_cpu_inc -# define __this_cpu_inc(pcp) __this_cpu_add((pcp), 1) +#ifndef raw_cpu_inc +# define raw_cpu_inc(pcp) raw_cpu_add((pcp), 1) #endif -#ifndef __this_cpu_dec -# define __this_cpu_dec(pcp) __this_cpu_sub((pcp), 1) +#ifndef raw_cpu_dec +# define raw_cpu_dec(pcp) raw_cpu_sub((pcp), 1) #endif -#ifndef __this_cpu_and -# ifndef __this_cpu_and_1 -# define __this_cpu_and_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) +#ifndef raw_cpu_and +# ifndef raw_cpu_and_1 +# define raw_cpu_and_1(pcp, val) raw_cpu_generic_to_op((pcp), (val), &=) # endif -# ifndef __this_cpu_and_2 -# define __this_cpu_and_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) +# ifndef raw_cpu_and_2 +# define raw_cpu_and_2(pcp, val) raw_cpu_generic_to_op((pcp), (val), &=) # endif -# ifndef __this_cpu_and_4 -# define __this_cpu_and_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) +# ifndef raw_cpu_and_4 +# define raw_cpu_and_4(pcp, val) raw_cpu_generic_to_op((pcp), (val), &=) # endif -# ifndef __this_cpu_and_8 -# define __this_cpu_and_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) +# ifndef raw_cpu_and_8 +# define raw_cpu_and_8(pcp, val) raw_cpu_generic_to_op((pcp), (val), &=) # endif -# define __this_cpu_and(pcp, val) __pcpu_size_call(__this_cpu_and_, (pcp), (val)) +# define raw_cpu_and(pcp, val) __pcpu_size_call(raw_cpu_and_, (pcp), (val)) #endif -#ifndef __this_cpu_or -# ifndef __this_cpu_or_1 -# define __this_cpu_or_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) +#ifndef raw_cpu_or +# ifndef raw_cpu_or_1 +# define raw_cpu_or_1(pcp, val) raw_cpu_generic_to_op((pcp), (val), |=) # endif -# ifndef __this_cpu_or_2 -# define __this_cpu_or_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) +# ifndef raw_cpu_or_2 +# define raw_cpu_or_2(pcp, val) raw_cpu_generic_to_op((pcp), (val), |=) # endif -# ifndef __this_cpu_or_4 -# define __this_cpu_or_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) +# ifndef raw_cpu_or_4 +# define raw_cpu_or_4(pcp, val) raw_cpu_generic_to_op((pcp), (val), |=) # endif -# ifndef __this_cpu_or_8 -# define __this_cpu_or_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) +# ifndef raw_cpu_or_8 +# define raw_cpu_or_8(pcp, val) raw_cpu_generic_to_op((pcp), (val), |=) # endif -# define __this_cpu_or(pcp, val) __pcpu_size_call(__this_cpu_or_, (pcp), (val)) +# define raw_cpu_or(pcp, val) __pcpu_size_call(raw_cpu_or_, (pcp), (val)) #endif -#ifndef __this_cpu_xor -# ifndef __this_cpu_xor_1 -# define __this_cpu_xor_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) +#ifndef raw_cpu_xor +# ifndef raw_cpu_xor_1 +# define raw_cpu_xor_1(pcp, val) raw_cpu_generic_to_op((pcp), (val), ^=) # endif -# ifndef __this_cpu_xor_2 -# define __this_cpu_xor_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) +# ifndef raw_cpu_xor_2 +# define raw_cpu_xor_2(pcp, val) raw_cpu_generic_to_op((pcp), (val), ^=) # endif -# ifndef __this_cpu_xor_4 -# define __this_cpu_xor_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) +# ifndef raw_cpu_xor_4 +# define raw_cpu_xor_4(pcp, val) raw_cpu_generic_to_op((pcp), (val), ^=) # endif -# ifndef __this_cpu_xor_8 -# define __this_cpu_xor_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) +# ifndef raw_cpu_xor_8 +# define raw_cpu_xor_8(pcp, val) raw_cpu_generic_to_op((pcp), (val), ^=) # endif -# define __this_cpu_xor(pcp, val) __pcpu_size_call(__this_cpu_xor_, (pcp), (val)) +# define raw_cpu_xor(pcp, val) __pcpu_size_call(raw_cpu_xor_, (pcp), (val)) #endif -#define __this_cpu_generic_add_return(pcp, val) \ +#define raw_cpu_generic_add_return(pcp, val) \ ({ \ - __this_cpu_add(pcp, val); \ - __this_cpu_read(pcp); \ + raw_cpu_add(pcp, val); \ + raw_cpu_read(pcp); \ }) -#ifndef __this_cpu_add_return -# ifndef __this_cpu_add_return_1 -# define __this_cpu_add_return_1(pcp, val) __this_cpu_generic_add_return(pcp, val) +#ifndef raw_cpu_add_return +# ifndef raw_cpu_add_return_1 +# define raw_cpu_add_return_1(pcp, val) raw_cpu_generic_add_return(pcp, val) # endif -# ifndef __this_cpu_add_return_2 -# define __this_cpu_add_return_2(pcp, val) __this_cpu_generic_add_return(pcp, val) +# ifndef raw_cpu_add_return_2 +# define raw_cpu_add_return_2(pcp, val) raw_cpu_generic_add_return(pcp, val) # endif -# ifndef __this_cpu_add_return_4 -# define __this_cpu_add_return_4(pcp, val) __this_cpu_generic_add_return(pcp, val) +# ifndef raw_cpu_add_return_4 +# define raw_cpu_add_return_4(pcp, val) raw_cpu_generic_add_return(pcp, val) # endif -# ifndef __this_cpu_add_return_8 -# define __this_cpu_add_return_8(pcp, val) __this_cpu_generic_add_return(pcp, val) +# ifndef raw_cpu_add_return_8 +# define raw_cpu_add_return_8(pcp, val) raw_cpu_generic_add_return(pcp, val) # endif -# define __this_cpu_add_return(pcp, val) \ - __pcpu_size_call_return2(__this_cpu_add_return_, pcp, val) +# define raw_cpu_add_return(pcp, val) \ + __pcpu_size_call_return2(raw_cpu_add_return_, pcp, val) #endif -#define __this_cpu_sub_return(pcp, val) __this_cpu_add_return(pcp, -(val)) -#define __this_cpu_inc_return(pcp) __this_cpu_add_return(pcp, 1) -#define __this_cpu_dec_return(pcp) __this_cpu_add_return(pcp, -1) +#define raw_cpu_sub_return(pcp, val) raw_cpu_add_return(pcp, -(val)) +#define raw_cpu_inc_return(pcp) raw_cpu_add_return(pcp, 1) +#define raw_cpu_dec_return(pcp) raw_cpu_add_return(pcp, -1) -#define __this_cpu_generic_xchg(pcp, nval) \ +#define raw_cpu_generic_xchg(pcp, nval) \ ({ typeof(pcp) ret__; \ - ret__ = __this_cpu_read(pcp); \ - __this_cpu_write(pcp, nval); \ + ret__ = raw_cpu_read(pcp); \ + raw_cpu_write(pcp, nval); \ ret__; \ }) -#ifndef __this_cpu_xchg -# ifndef __this_cpu_xchg_1 -# define __this_cpu_xchg_1(pcp, nval) __this_cpu_generic_xchg(pcp, nval) +#ifndef raw_cpu_xchg +# ifndef raw_cpu_xchg_1 +# define raw_cpu_xchg_1(pcp, nval) raw_cpu_generic_xchg(pcp, nval) # endif -# ifndef __this_cpu_xchg_2 -# define __this_cpu_xchg_2(pcp, nval) __this_cpu_generic_xchg(pcp, nval) +# ifndef raw_cpu_xchg_2 +# define raw_cpu_xchg_2(pcp, nval) raw_cpu_generic_xchg(pcp, nval) # endif -# ifndef __this_cpu_xchg_4 -# define __this_cpu_xchg_4(pcp, nval) __this_cpu_generic_xchg(pcp, nval) +# ifndef raw_cpu_xchg_4 +# define raw_cpu_xchg_4(pcp, nval) raw_cpu_generic_xchg(pcp, nval) # endif -# ifndef __this_cpu_xchg_8 -# define __this_cpu_xchg_8(pcp, nval) __this_cpu_generic_xchg(pcp, nval) +# ifndef raw_cpu_xchg_8 +# define raw_cpu_xchg_8(pcp, nval) raw_cpu_generic_xchg(pcp, nval) # endif -# define __this_cpu_xchg(pcp, nval) \ - __pcpu_size_call_return2(__this_cpu_xchg_, (pcp), nval) +# define raw_cpu_xchg(pcp, nval) \ + __pcpu_size_call_return2(raw_cpu_xchg_, (pcp), nval) #endif -#define __this_cpu_generic_cmpxchg(pcp, oval, nval) \ +#define raw_cpu_generic_cmpxchg(pcp, oval, nval) \ ({ \ typeof(pcp) ret__; \ - ret__ = __this_cpu_read(pcp); \ + ret__ = raw_cpu_read(pcp); \ if (ret__ == (oval)) \ - __this_cpu_write(pcp, nval); \ + raw_cpu_write(pcp, nval); \ ret__; \ }) -#ifndef __this_cpu_cmpxchg -# ifndef __this_cpu_cmpxchg_1 -# define __this_cpu_cmpxchg_1(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) +#ifndef raw_cpu_cmpxchg +# ifndef raw_cpu_cmpxchg_1 +# define raw_cpu_cmpxchg_1(pcp, oval, nval) raw_cpu_generic_cmpxchg(pcp, oval, nval) # endif -# ifndef __this_cpu_cmpxchg_2 -# define __this_cpu_cmpxchg_2(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) +# ifndef raw_cpu_cmpxchg_2 +# define raw_cpu_cmpxchg_2(pcp, oval, nval) raw_cpu_generic_cmpxchg(pcp, oval, nval) # endif -# ifndef __this_cpu_cmpxchg_4 -# define __this_cpu_cmpxchg_4(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) +# ifndef raw_cpu_cmpxchg_4 +# define raw_cpu_cmpxchg_4(pcp, oval, nval) raw_cpu_generic_cmpxchg(pcp, oval, nval) # endif -# ifndef __this_cpu_cmpxchg_8 -# define __this_cpu_cmpxchg_8(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) +# ifndef raw_cpu_cmpxchg_8 +# define raw_cpu_cmpxchg_8(pcp, oval, nval) raw_cpu_generic_cmpxchg(pcp, oval, nval) # endif -# define __this_cpu_cmpxchg(pcp, oval, nval) \ - __pcpu_size_call_return2(__this_cpu_cmpxchg_, pcp, oval, nval) +# define raw_cpu_cmpxchg(pcp, oval, nval) \ + __pcpu_size_call_return2(raw_cpu_cmpxchg_, pcp, oval, nval) #endif -#define __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ +#define raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ ({ \ int __ret = 0; \ - if (__this_cpu_read(pcp1) == (oval1) && \ - __this_cpu_read(pcp2) == (oval2)) { \ - __this_cpu_write(pcp1, (nval1)); \ - __this_cpu_write(pcp2, (nval2)); \ + if (raw_cpu_read(pcp1) == (oval1) && \ + raw_cpu_read(pcp2) == (oval2)) { \ + raw_cpu_write(pcp1, (nval1)); \ + raw_cpu_write(pcp2, (nval2)); \ __ret = 1; \ } \ (__ret); \ }) -#ifndef __this_cpu_cmpxchg_double -# ifndef __this_cpu_cmpxchg_double_1 -# define __this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \ - __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) +#ifndef raw_cpu_cmpxchg_double +# ifndef raw_cpu_cmpxchg_double_1 +# define raw_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \ + raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) # endif -# ifndef __this_cpu_cmpxchg_double_2 -# define __this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \ - __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) +# ifndef raw_cpu_cmpxchg_double_2 +# define raw_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \ + raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) # endif -# ifndef __this_cpu_cmpxchg_double_4 -# define __this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \ - __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) +# ifndef raw_cpu_cmpxchg_double_4 +# define raw_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \ + raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) # endif -# ifndef __this_cpu_cmpxchg_double_8 -# define __this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \ - __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) +# ifndef raw_cpu_cmpxchg_double_8 +# define raw_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \ + raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) # endif -# define __this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ - __pcpu_double_call_return_bool(__this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2)) +# define raw_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ + __pcpu_double_call_return_bool(raw_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2)) +#endif + +#ifdef CONFIG_DEBUG_PREEMPT +extern void __this_cpu_preempt_check(const char *msg); +#else +static inline void __this_cpu_preempt_check(const char *msg) { } #endif +/* + * Generic percpu operations for context that are safe from preemption/interrupts. + * These functions verify that preemption has been disabled. + */ +#define __this_cpu_read(pcp) \ + (__this_cpu_preempt_check("read"), raw_cpu_read(pcp)) + +#define __this_cpu_write(pcp, val) \ +do { \ + __this_cpu_preempt_check("write"); \ + raw_cpu_write((pcp), (val)); \ +} while (0) + +#define __this_cpu_add(pcp, val) \ +do { \ + __this_cpu_preempt_check("add"); \ + raw_cpu_add((pcp), (val)); \ +} while (0) + +#define __this_cpu_sub(pcp, val) \ +do { \ + __this_cpu_preempt_check("sub"); \ + raw_cpu_sub((pcp), (val)); \ +} while (0) + +#define __this_cpu_inc(pcp) \ +do { \ + __this_cpu_preempt_check("inc"); \ + raw_cpu_inc(pcp); \ +} while (0) + +#define __this_cpu_dec(pcp) \ +do { \ + __this_cpu_preempt_check("dec"); \ + raw_cpu_dec(pcp); \ +} while (0) + +#define __this_cpu_and(pcp, val) \ +do { \ + __this_cpu_preempt_check("and"); \ + raw_cpu_and((pcp), (val)); \ +} while (0) + +#define __this_cpu_or(pcp, val) \ +do { \ + __this_cpu_preempt_check("or"); \ + raw_cpu_or((pcp), (val)); \ +} while (0) + +#define __this_cpu_xor(pcp, val) \ +do { \ + __this_cpu_preempt_check("xor"); \ + raw_cpu_xor((pcp), (val)); \ +} while (0) + +#define __this_cpu_add_return(pcp, val) \ + (__this_cpu_preempt_check("add_return"), raw_cpu_add_return((pcp), (val))) + +#define __this_cpu_sub_return(pcp, val) \ + (__this_cpu_preempt_check("sub_return"), raw_cpu_sub_return((pcp), (val))) + +#define __this_cpu_inc_return(pcp) \ + (__this_cpu_preempt_check("inc_return"), raw_cpu_inc_return(pcp)) + +#define __this_cpu_dec_return(pcp) \ + (__this_cpu_preempt_check("dec_return"), raw_cpu_dec_return(pcp)) + +#define __this_cpu_xchg(pcp, val) \ + (__this_cpu_preempt_check("xchg"), raw_cpu_xchg((pcp), (val))) + +#define __this_cpu_cmpxchg(pcp, oval, nval) \ + (__this_cpu_preempt_check("cmpxchg"), raw_cpu_cmpxchg((pcp), (oval), (nval))) + +#define __this_cpu_cmpxchg_double(pcp, oval1, oval2, nval1, nval2) \ + (__this_cpu_preempt_check("cmpxchg_double"), \ + raw_cpu_cmpxchg_double((pcp), (oval1), (oval2), (nval1), (nval2))) + #endif /* __LINUX_PERCPU_H */ diff --git a/lib/smp_processor_id.c b/lib/smp_processor_id.c index 04abe53..f474347 100644 --- a/lib/smp_processor_id.c +++ b/lib/smp_processor_id.c @@ -7,7 +7,7 @@ #include <linux/kallsyms.h> #include <linux/sched.h> -notrace unsigned int debug_smp_processor_id(void) +notrace static unsigned int debug_preempt_check(char *msg) { int this_cpu = raw_smp_processor_id(); @@ -38,9 +38,8 @@ notrace unsigned int debug_smp_processor_id(void) if (!printk_ratelimit()) goto out_enable; - printk(KERN_ERR "BUG: using smp_processor_id() in preemptible [%08x] " - "code: %s/%d\n", - preempt_count() - 1, current->comm, current->pid); + printk(KERN_ERR "BUG: using %s in preemptible [%08x] code: %s/%d\n", + msg, preempt_count() - 1, current->comm, current->pid); print_symbol("caller is %s\n", (long)__builtin_return_address(0)); dump_stack(); @@ -50,5 +49,17 @@ notrace unsigned int debug_smp_processor_id(void) return this_cpu; } +notrace unsigned int debug_smp_processor_id(void) +{ + return debug_preempt_check("smp_processor_id()"); +} EXPORT_SYMBOL(debug_smp_processor_id); +notrace void __this_cpu_preempt_check(const char *msg) +{ + char op[40]; + + snprintf(op, sizeof(op), "__this_cpu_%s()", msg); + debug_preempt_check(op); +} +EXPORT_SYMBOL(__this_cpu_preempt_check);
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