Commit 534e3adb authored Apr 27, 2011 by Richard Weinberger Committed by Linus Torvalds Apr 28, 2011

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>

parent 365a0dea

arch/um/include/asm/thread_info.h

+4 −1

Original line number	Diff line number	Diff line
		@@ -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;
		}