Commit 534e3adb authored by Richard Weinberger's avatar Richard Weinberger Committed by Linus Torvalds

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: default avatarRichard Weinberger <richard@nod.at>
Acked-by: default avatarKirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 365a0dea
...@@ -49,7 +49,10 @@ static inline struct thread_info *current_thread_info(void) ...@@ -49,7 +49,10 @@ static inline struct thread_info *current_thread_info(void)
{ {
struct thread_info *ti; struct thread_info *ti;
unsigned long mask = THREAD_SIZE - 1; 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; return ti;
} }
......
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