Messages in this thread | | | Subject | Re: [PATCH v4 3/4] powerpc/64: make buildable without CONFIG_COMPAT | From | Christophe Leroy <> | Date | Thu, 29 Aug 2019 19:40:55 +0200 |
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Le 29/08/2019 à 12:23, Michal Suchanek a écrit : > There are numerous references to 32bit functions in generic and 64bit > code so ifdef them out. > > Signed-off-by: Michal Suchanek <msuchanek@suse.de> > --- > v2: > - fix 32bit ifdef condition in signal.c > - simplify the compat ifdef condition in vdso.c - 64bit is redundant > - simplify the compat ifdef condition in callchain.c - 64bit is redundant > v3: > - use IS_ENABLED and maybe_unused where possible > - do not ifdef declarations > - clean up Makefile > v4: > - further makefile cleanup > - simplify is_32bit_task conditions > - avoid ifdef in condition by using return > --- > arch/powerpc/include/asm/thread_info.h | 4 ++-- > arch/powerpc/kernel/Makefile | 7 +++---- > arch/powerpc/kernel/entry_64.S | 2 ++ > arch/powerpc/kernel/signal.c | 3 +-- > arch/powerpc/kernel/syscall_64.c | 6 ++---- > arch/powerpc/kernel/vdso.c | 5 ++--- > arch/powerpc/perf/callchain.c | 14 ++++++++++---- > 7 files changed, 22 insertions(+), 19 deletions(-) > > diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h > index 8e1d0195ac36..c128d8a48ea3 100644 > --- a/arch/powerpc/include/asm/thread_info.h > +++ b/arch/powerpc/include/asm/thread_info.h > @@ -144,10 +144,10 @@ static inline bool test_thread_local_flags(unsigned int flags) > return (ti->local_flags & flags) != 0; > } > > -#ifdef CONFIG_PPC64 > +#ifdef CONFIG_COMPAT > #define is_32bit_task() (test_thread_flag(TIF_32BIT)) > #else > -#define is_32bit_task() (1) > +#define is_32bit_task() (IS_ENABLED(CONFIG_PPC32)) > #endif > > #if defined(CONFIG_PPC64) > diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile > index 1d646a94d96c..9d8772e863b9 100644 > --- a/arch/powerpc/kernel/Makefile > +++ b/arch/powerpc/kernel/Makefile > @@ -44,16 +44,15 @@ CFLAGS_btext.o += -DDISABLE_BRANCH_PROFILING > endif > > obj-y := cputable.o ptrace.o syscalls.o \ > - irq.o align.o signal_32.o pmc.o vdso.o \ > + irq.o align.o signal_$(BITS).o pmc.o vdso.o \ > process.o systbl.o idle.o \ > signal.o sysfs.o cacheinfo.o time.o \ > prom.o traps.o setup-common.o \ > udbg.o misc.o io.o misc_$(BITS).o \ > of_platform.o prom_parse.o > -obj-$(CONFIG_PPC64) += setup_64.o sys_ppc32.o \ > - signal_64.o ptrace32.o \ > - paca.o nvram_64.o firmware.o \ > +obj-$(CONFIG_PPC64) += setup_64.o paca.o nvram_64.o firmware.o \ > syscall_64.o > +obj-$(CONFIG_COMPAT) += sys_ppc32.o ptrace32.o signal_32.o > obj-$(CONFIG_VDSO32) += vdso32/ > obj-$(CONFIG_PPC_WATCHDOG) += watchdog.o > obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o > diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S > index 2ec825a85f5b..a2dbf216f607 100644 > --- a/arch/powerpc/kernel/entry_64.S > +++ b/arch/powerpc/kernel/entry_64.S > @@ -51,8 +51,10 @@ > SYS_CALL_TABLE: > .tc sys_call_table[TC],sys_call_table > > +#ifdef CONFIG_COMPAT > COMPAT_SYS_CALL_TABLE: > .tc compat_sys_call_table[TC],compat_sys_call_table > +#endif > > /* This value is used to mark exception frames on the stack. */ > exception_marker: > diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c > index 60436432399f..61678cb0e6a1 100644 > --- a/arch/powerpc/kernel/signal.c > +++ b/arch/powerpc/kernel/signal.c > @@ -247,7 +247,6 @@ static void do_signal(struct task_struct *tsk) > sigset_t *oldset = sigmask_to_save(); > struct ksignal ksig = { .sig = 0 }; > int ret; > - int is32 = is_32bit_task(); > > BUG_ON(tsk != current); > > @@ -277,7 +276,7 @@ static void do_signal(struct task_struct *tsk) > > rseq_signal_deliver(&ksig, tsk->thread.regs); > > - if (is32) { > + if (is_32bit_task()) { > if (ksig.ka.sa.sa_flags & SA_SIGINFO) > ret = handle_rt_signal32(&ksig, oldset, tsk); > else > diff --git a/arch/powerpc/kernel/syscall_64.c b/arch/powerpc/kernel/syscall_64.c > index 98ed970796d5..0d5cbbe54cf1 100644 > --- a/arch/powerpc/kernel/syscall_64.c > +++ b/arch/powerpc/kernel/syscall_64.c > @@ -38,7 +38,6 @@ typedef long (*syscall_fn)(long, long, long, long, long, long); > > long system_call_exception(long r3, long r4, long r5, long r6, long r7, long r8, unsigned long r0, struct pt_regs *regs) > { > - unsigned long ti_flags; > syscall_fn f; > > BUG_ON(!(regs->msr & MSR_PR)); > @@ -83,8 +82,7 @@ long system_call_exception(long r3, long r4, long r5, long r6, long r7, long r8, > */ > regs->softe = IRQS_ENABLED; > > - ti_flags = current_thread_info()->flags; > - if (unlikely(ti_flags & _TIF_SYSCALL_DOTRACE)) { > + if (unlikely(current_thread_info()->flags & _TIF_SYSCALL_DOTRACE)) { > /* > * We use the return value of do_syscall_trace_enter() as the > * syscall number. If the syscall was rejected for any reason > @@ -100,7 +98,7 @@ long system_call_exception(long r3, long r4, long r5, long r6, long r7, long r8, > /* May be faster to do array_index_nospec? */ > barrier_nospec(); > > - if (unlikely(ti_flags & _TIF_32BIT)) { > + if (unlikely(is_32bit_task())) { > f = (void *)compat_sys_call_table[r0]; > > r3 &= 0x00000000ffffffffULL; > diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c > index d60598113a9f..6d4a077f74d6 100644 > --- a/arch/powerpc/kernel/vdso.c > +++ b/arch/powerpc/kernel/vdso.c > @@ -667,9 +667,7 @@ static void __init vdso_setup_syscall_map(void) > { > unsigned int i; > extern unsigned long *sys_call_table; > -#ifdef CONFIG_PPC64 > extern unsigned long *compat_sys_call_table; > -#endif > extern unsigned long sys_ni_syscall; > > > @@ -678,7 +676,8 @@ static void __init vdso_setup_syscall_map(void) > if (sys_call_table[i] != sys_ni_syscall) > vdso_data->syscall_map_64[i >> 5] |= > 0x80000000UL >> (i & 0x1f); > - if (compat_sys_call_table[i] != sys_ni_syscall) > + if (IS_ENABLED(CONFIG_COMPAT) && > + compat_sys_call_table[i] != sys_ni_syscall) > vdso_data->syscall_map_32[i >> 5] |= > 0x80000000UL >> (i & 0x1f); > #else /* CONFIG_PPC64 */ > diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c > index c84bbd4298a0..aef8c750d242 100644 > --- a/arch/powerpc/perf/callchain.c > +++ b/arch/powerpc/perf/callchain.c > @@ -15,7 +15,7 @@ > #include <asm/sigcontext.h> > #include <asm/ucontext.h> > #include <asm/vdso.h> > -#ifdef CONFIG_PPC64 > +#ifdef CONFIG_COMPAT
Is this ifdef needed at all ? Is it a problem to include it all the time ?
> #include "../kernel/ppc32.h" > #endif > #include <asm/pte-walk.h> > @@ -165,6 +165,7 @@ static int read_user_stack_64(unsigned long __user *ptr, unsigned long *ret) > return read_user_stack_slow(ptr, ret, 8); > } > > +__maybe_unused
I don't like that too much. I see this function is almost identical between PPC64 and PPC32. It should be possible to have only one, using IS_ENABLED(CONFIG_PPC64) inside it to call read_user_stack_slow(). An define a dummy read_user_stack_slow() for PPC32 as already done for perf_callchain_user_64().
> static int read_user_stack_32(unsigned int __user *ptr, unsigned int *ret) > { > if ((unsigned long)ptr > TASK_SIZE - sizeof(unsigned int) || > @@ -341,6 +342,7 @@ static inline int valid_user_sp(unsigned long sp, int is_64) > > #endif /* CONFIG_PPC64 */ > > +#if defined(CONFIG_PPC32) || defined(CONFIG_COMPAT) > /* > * Layout for non-RT signal frames > */ > @@ -482,12 +484,16 @@ static void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry, > sp = next_sp; > } > } > +#endif /* 32bit */ > > void > perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) > { > - if (current_is_64bit()) > - perf_callchain_user_64(entry, regs); > - else > +#if defined(CONFIG_PPC32) || defined(CONFIG_COMPAT) > + if (!current_is_64bit()) { > perf_callchain_user_32(entry, regs); > + return; > + } > +#endif > + perf_callchain_user_64(entry, regs); > } >
Instead of that it could just be:
if (current_is_64bit()) perf_callchain_user_64(entry, regs); else perf_callchain_user_32(entry, regs);
By adding a dummy perf_callchain_user_32() when needed as already done for perf_callchain_user_64() And by making sure current_is_64bit() returns IS_ENABLED(CONFIG_PPC64) when CONFIG_COMPAT is not set, on the same principle as you did for is_32bit_task()
And maybe you could think about spliting callchain.c out in a callchain_32.c and a callchain_64.c that gets selected by the Makefiles based on the same principle as you did for ptrace_32.c etc...
Christophe
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