From 1e8352784abaedb424e63fa700e93e6c1307785f Mon Sep 17 00:00:00 2001 From: Hugh Dickins Date: Sat, 23 Feb 2008 19:40:17 +0000 Subject: 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 Reviewed-by: Mike Travis Signed-off-by: Linus Torvalds --- include/asm-generic/percpu.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/asm-generic') diff --git a/include/asm-generic/percpu.h b/include/asm-generic/percpu.h index 4b8d31cda1a..b0e63c672eb 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 -- cgit v1.2.3-70-g09d2