From 2a3535069e33d8b416f406c159ce924427315303 Mon Sep 17 00:00:00 2001 From: Andreas Schwab Date: Mon, 9 Jan 2012 15:10:15 +0100 Subject: m68k: Fix assembler constraint to prevent overeager gcc optimisation Passing the address of a variable as an operand to an asm statement doesn't mark the value of this variable as used, so gcc may optimize its initialisation away. Fix this by using the "m" constraint instead. Signed-off-by: Andreas Schwab Signed-off-by: Geert Uytterhoeven Cc: stable@vger.kernel.org --- arch/m68k/mm/cache.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'arch/m68k/mm') diff --git a/arch/m68k/mm/cache.c b/arch/m68k/mm/cache.c index 5437fff5fe07..5550aa4fd811 100644 --- a/arch/m68k/mm/cache.c +++ b/arch/m68k/mm/cache.c @@ -52,9 +52,9 @@ static unsigned long virt_to_phys_slow(unsigned long vaddr) unsigned long *descaddr; asm volatile ("ptestr %3,%2@,#7,%0\n\t" - "pmove %%psr,%1@" - : "=a&" (descaddr) - : "a" (&mmusr), "a" (vaddr), "d" (get_fs().seg)); + "pmove %%psr,%1" + : "=a&" (descaddr), "=m" (mmusr) + : "a" (vaddr), "d" (get_fs().seg)); if (mmusr & (MMU_I|MMU_B|MMU_L)) return 0; descaddr = phys_to_virt((unsigned long)descaddr); -- cgit v1.2.1