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authorTejun Heo <tj@kernel.org>2009-06-30 11:41:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-30 18:55:59 -0700
commitb01e8dc34379f4ba2f454390e340a025edbaaa7e (patch)
tree8498a81a819180b7308e2dcbc4d078b45898ccdf /include/asm-generic
parent15e3252464432a29c5461325cb5243471bd2a219 (diff)
downloadblackbird-op-linux-b01e8dc34379f4ba2f454390e340a025edbaaa7e.tar.gz
blackbird-op-linux-b01e8dc34379f4ba2f454390e340a025edbaaa7e.zip
alpha: fix percpu build breakage
alpha percpu access requires custom SHIFT_PERCPU_PTR() definition for modules to work around addressing range limitation. This is done via generating inline assembly using C preprocessing which forces the assembler to generate external reference. This happens behind the compiler's back and makes the compiler think that static percpu variables in modules are unused. This used to be worked around by using __unused attribute for percpu variables which prevent the compiler from omitting the variable; however, recent declare/definition attribute unification change broke this as __used can't be used for declaration. Also, in the process, PER_CPU_ATTRIBUTES definition in alpha percpu.h got broken. This patch adds PER_CPU_DEF_ATTRIBUTES which is only used for definitions and make alpha use it to add __used for percpu variables in modules. This also fixes the PER_CPU_ATTRIBUTES double definition bug. Signed-off-by: Tejun Heo <tj@kernel.org> Tested-by: maximilian attems <max@stro.at> Acked-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Richard Henderson <rth@twiddle.net> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-generic')
-rw-r--r--include/asm-generic/percpu.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/asm-generic/percpu.h b/include/asm-generic/percpu.h
index d7d50d7ee51e..aa00800adacc 100644
--- a/include/asm-generic/percpu.h
+++ b/include/asm-generic/percpu.h
@@ -97,4 +97,8 @@ extern void setup_per_cpu_areas(void);
#define PER_CPU_ATTRIBUTES
#endif
+#ifndef PER_CPU_DEF_ATTRIBUTES
+#define PER_CPU_DEF_ATTRIBUTES
+#endif
+
#endif /* _ASM_GENERIC_PERCPU_H_ */
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