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| author | Richard Weinberger <richard@nod.at> | 2011-04-27 15:26:54 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-04-28 11:28:21 -0700 |
| commit | 534e3adbd22efa327e6ff27cf2d8ebaad8382ecd (patch) | |
| tree | b45ec4d6debc312616e8d0590dacaed0b87e849f /arch/um | |
| parent | 365a0deae2b6743b3263a71871bbd8c9f66ac34c (diff) | |
| download | linux-stable-534e3adbd22efa327e6ff27cf2d8ebaad8382ecd.tar.gz linux-stable-534e3adbd22efa327e6ff27cf2d8ebaad8382ecd.tar.bz2 linux-stable-534e3adbd22efa327e6ff27cf2d8ebaad8382ecd.zip | |
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 <richard@nod.at>
Acked-by: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um')
| -rw-r--r-- | 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 e2cf786bda0a..5bd1bad33fab 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; } |