Messages in this thread Patch in this message | | | Date | Tue, 13 May 2008 17:12:11 +0200 | From | Eric Dumazet <> | Subject | [PATCH] per_cpu: fix DEFINE_PER_CPU_SHARED_ALIGNED for modules |
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Andrew,
This patch is a follow up to thread initiated by Gianni Tedesco in http://marc.info/?l=linux-kernel&m=121059431214889&w=2 (oprofile BUG() in current kernel.)
Thank you
[PATCH] per_cpu: fix DEFINE_PER_CPU_SHARED_ALIGNED for modules
Current module loader lookups ".data.percpu" ELF section to perform per_cpu relocation. But DEFINE_PER_CPU_SHARED_ALIGNED() uses another section (".data.percpu.shared_aligned"), currently only handled in vmlinux.lds, not by module loader.
To correct this problem, instead of adding logic into module loader, or using at build time a module.lds file for all arches to group ".data.percpu.shared_aligned" into ".data.percpu", just use ".data.percpu" for modules.
Alignment requirements are correctly handled by ld and module loader.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> --- include/linux/percpu.h | 8 +++++++- 1 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/include/linux/percpu.h b/include/linux/percpu.h index d746a2a..0bb9e91 100644 --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -13,8 +13,14 @@ __attribute__((__section__(".data.percpu"))) \ PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name +#ifdef CONFIG_MODULES +#define SHARED_ALIGNED_SECTION ".data.percpu" +#else +#define SHARED_ALIGNED_SECTION ".data.percpu.shared_aligned" +#endif + #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ - __attribute__((__section__(".data.percpu.shared_aligned"))) \ + __attribute__((__section__(SHARED_ALIGNED_SECTION))) \ PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name \ ____cacheline_aligned_in_smp #else | |