Messages in this thread Patch in this message | | | Subject | Re: [PATCH -mm] x86_64 UP needs smp_call_function_single | From | Ingo Molnar <> | Date | Thu, 30 Nov 2006 08:00:00 +0100 |
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On Wed, 2006-11-29 at 17:45 -0800, Andrew Morton wrote: > No, I think this patch is right - the declaration of the CONFIG_SMP > smp_call_function_single() is in linux/smp.h so the !CONFIG_SMP > declaration > or definition should be there too. > > It's still buggy though. It should disable local interrupts around > the > call to match the SMP version. I'll fix that separately.
hm, didnt i send an updated patch for that already? See the patch below, from many days ago. I sent it after the tsc-sync-rewrite patch.
Ingo
---------------> Subject: x86_64: build fixes From: Ingo Molnar <mingo@elte.hu>
x86_64 does not build cleanly on UP:
arch/x86_64/kernel/vsyscall.c: In function 'cpu_vsyscall_notifier': arch/x86_64/kernel/vsyscall.c:282: warning: implicit declaration of function 'smp_call_function_single' arch/x86_64/kernel/vsyscall.c: At top level: arch/x86_64/kernel/vsyscall.c:279: warning: 'cpu_vsyscall_notifier' defined but not used
this patch fixes it by making smp_call_function_single() globally available.
Signed-off-by: Ingo Molnar <mingo@elte.hu> --- include/asm-x86_64/smp.h | 11 ++--------- include/linux/smp.h | 10 +++++++--- kernel/sched.c | 19 +++++++++++++++++++ 3 files changed, 28 insertions(+), 12 deletions(-)
Index: linux/include/asm-x86_64/smp.h =================================================================== --- linux.orig/include/asm-x86_64/smp.h +++ linux/include/asm-x86_64/smp.h @@ -115,16 +115,9 @@ static __inline int logical_smp_processo } #ifdef CONFIG_SMP -#define cpu_physical_id(cpu) x86_cpu_to_apicid[cpu] +# define cpu_physical_id(cpu) x86_cpu_to_apicid[cpu] #else -#define cpu_physical_id(cpu) boot_cpu_id -static inline int smp_call_function_single(int cpuid, void (*func) (void *info), - void *info, int retry, int wait) -{ - /* Disable interrupts here? */ - func(info); - return 0; -} +# define cpu_physical_id(cpu) boot_cpu_id #endif /* !CONFIG_SMP */ #endif Index: linux/include/linux/smp.h =================================================================== --- linux.orig/include/linux/smp.h +++ linux/include/linux/smp.h @@ -53,9 +53,6 @@ extern void smp_cpus_done(unsigned int m */ int smp_call_function(void(*func)(void *info), void *info, int retry, int wait); -int smp_call_function_single(int cpuid, void (*func) (void *info), void *info, - int retry, int wait); - /* * Call a function on all processors */ @@ -103,6 +100,13 @@ static inline void smp_send_reschedule(i #endif /* !SMP */ /* + * Call a function on a specific CPU (on UP the function gets executed + * on the current CPU, immediately): + */ +int smp_call_function_single(int cpuid, void (*func) (void *info), void *info, + int retry, int wait); + +/* * smp_processor_id(): get the current CPU ID. * * if DEBUG_PREEMPT is enabled the we check whether it is Index: linux/kernel/sched.c =================================================================== --- linux.orig/kernel/sched.c +++ linux/kernel/sched.c @@ -1110,6 +1110,25 @@ repeat: task_rq_unlock(rq, &flags); } +#ifndef CONFIG_SMP +/* + * Call a function on a specific CPU (on UP the function gets executed + * on the current CPU, immediately): + */ +int smp_call_function_single(int cpuid, void (*func) (void *info), void *info, + int retry, int wait) +{ + unsigned long flags; + + local_irq_save(flags); + func(info); + local_irq_restore(flags); + + return 0; +} +EXPORT_SYMBOL(smp_call_function_single); +#endif + /*** * kick_process - kick a running thread to enter/exit the kernel * @p: the to-be-kicked thread
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