From 534e3adbd22efa327e6ff27cf2d8ebaad8382ecd Mon Sep 17 00:00:00 2001 From: Richard Weinberger Date: Wed, 27 Apr 2011 15:26:54 -0700 Subject: [PATCH] um: adjust current_thread_info() for newer gcc versions In some cases gcc >= 4.5.2 will optimize away current_thread_info(). To prevent gcc from doing so the stack address has to be obtained via inline asm. Signed-off-by: Richard Weinberger Acked-by: Kirill A. Shutemov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/include/asm/thread_info.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) 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; } -- 2.7.4