From: Heiko Carstens <hca@xxxxxxxxxxxxx>
commit 89aba4c26fae4e459f755a18912845c348ee48f3 upstream.
Add missing earlyclobber annotation to size, to, and tmp2 operands of the
__clear_user() inline assembly since they are modified or written to before
the last usage of all input operands. This can lead to incorrect register
allocation for the inline assembly.
Fixes: 6c2a9e6df604 ("[S390] Use alternative user-copy operations for new hardware.")
Reported-by: Mark Rutland <mark.rutland@xxxxxxx>
Link: https://lore.kernel.org/all/20230321122514.1743889-3-mark.rutland@xxxxxxx/
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/s390/lib/uaccess.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/s390/lib/uaccess.c
+++ b/arch/s390/lib/uaccess.c
@@ -172,7 +172,7 @@ unsigned long __clear_user(void __user *
"4: slgr %0,%0\n"
"5:\n"
EX_TABLE(0b,2b) EX_TABLE(6b,2b) EX_TABLE(3b,5b) EX_TABLE(7b,5b)
- : "+a" (size), "+a" (to), "+a" (tmp1), "=a" (tmp2)
+ : "+&a" (size), "+&a" (to), "+a" (tmp1), "=&a" (tmp2)
: "a" (empty_zero_page), [spec] "d" (spec.val)
: "cc", "memory", "0");
return size;
