From: Richard W. <ri...@no...> - 2011-04-15 23:03:33
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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=201...@no... Signed-off-by: Richard Weinberger <ri...@no...> --- 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; } -- 1.6.6.1 |