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| author | Hugh Dickins <hugh@veritas.com> | 2008-02-23 22:40:17 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-23 23:09:28 +0300 |
| commit | 1e8352784abaedb424e63fa700e93e6c1307785f (patch) | |
| tree | eb7ba51fa40e209ed2a1636b3404cca58141bed1 | |
| parent | 3a2d5b700132f35401f1d9e22fe3c2cab02c2549 (diff) | |
| download | linux-1e8352784abaedb424e63fa700e93e6c1307785f.tar.xz | |
percpu: fix DEBUG_PREEMPT per_cpu checking
2.6.25-rc1 percpu changes broke CONFIG_DEBUG_PREEMPT's per_cpu checking
on several architectures. On s390, sparc64 and x86 it's been weakened to
not checking at all; whereas on powerpc64 it's become too strict, issuing
warnings from __raw_get_cpu_var in io_schedule and init_timer for example.
Fix this by weakening powerpc's __my_cpu_offset to use the non-checking
local_paca instead of get_paca (which itself contains such a check);
and strengthening the generic my_cpu_offset to go the old slow way via
smp_processor_id when CONFIG_DEBUG_PREEMPT (debug_smp_processor_id is
where all the knowledge of what's correct when lives).
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Reviewed-by: Mike Travis <travis@sgi.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/asm-generic/percpu.h | 2 | ||||
| -rw-r--r-- | include/asm-powerpc/percpu.h | 2 |
2 files changed, 3 insertions, 1 deletions
diff --git a/include/asm-generic/percpu.h b/include/asm-generic/percpu.h index 4b8d31cda1a0..b0e63c672ebd 100644 --- a/include/asm-generic/percpu.h +++ b/include/asm-generic/percpu.h @@ -32,6 +32,8 @@ extern unsigned long __per_cpu_offset[NR_CPUS]; */ #ifndef __my_cpu_offset #define __my_cpu_offset per_cpu_offset(raw_smp_processor_id()) +#endif +#ifdef CONFIG_DEBUG_PREEMPT #define my_cpu_offset per_cpu_offset(smp_processor_id()) #else #define my_cpu_offset __my_cpu_offset diff --git a/include/asm-powerpc/percpu.h b/include/asm-powerpc/percpu.h index ccb0523eb3b4..f879252b7ea6 100644 --- a/include/asm-powerpc/percpu.h +++ b/include/asm-powerpc/percpu.h @@ -13,7 +13,7 @@ #include <asm/paca.h> #define __per_cpu_offset(cpu) (paca[cpu].data_offset) -#define __my_cpu_offset get_paca()->data_offset +#define __my_cpu_offset local_paca->data_offset #define per_cpu_offset(x) (__per_cpu_offset(x)) #endif /* CONFIG_SMP */ |