From 44c81433e8b05dbc85985d939046f10f95901184 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <dada1@cosmosbay.com>
Date: Wed, 14 May 2008 16:05:51 -0700
Subject: [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>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
include/linux/percpu.h | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index d746a2abb322..4cdd393e71e1 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 MODULE
+#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
--
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