Messages in this thread Patch in this message | | | From | Richard Weinberger <> | Subject | [PATCH 1/3] um: Adjust current_thread_info() for gcc-4.6 | Date | Wed, 20 Apr 2011 13:34:24 +0200 |
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In some cases gcc-4.6 will optimize away current_thread_info(). To prevent gcc from doing so the stack address has to be obtained via inline asm.
LKML-Reference: http://marc.info/?i=201104132150.05623.richard@nod.at
Signed-off-by: Richard Weinberger <richard@nod.at> --- arch/um/include/asm/thread_info.h | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/arch/um/include/asm/thread_info.h b/arch/um/include/asm/thread_info.h index e2cf786..5bd1bad 100644 --- a/arch/um/include/asm/thread_info.h +++ b/arch/um/include/asm/thread_info.h @@ -49,7 +49,10 @@ static inline struct thread_info *current_thread_info(void) { struct thread_info *ti; unsigned long mask = THREAD_SIZE - 1; - ti = (struct thread_info *) (((unsigned long) &ti) & ~mask); + void *p; + + asm volatile ("" : "=r" (p) : "0" (&ti)); + ti = (struct thread_info *) (((unsigned long)p) & ~mask); return ti; } -- 1.7.4.2
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