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authorHeiko Carstens <hca@linux.ibm.com>2023-03-23 15:09:16 +0300
committerVasily Gorbik <gor@linux.ibm.com>2023-03-27 18:23:08 +0300
commit89aba4c26fae4e459f755a18912845c348ee48f3 (patch)
treef97844962557f2adec6a3a77c6df096ffb52f4e8 /arch
parentd7a0bdbf17276b757d2b89f5351bbee9ecf58fe6 (diff)
downloadlinux-89aba4c26fae4e459f755a18912845c348ee48f3.tar.xz
s390/uaccess: add missing earlyclobber annotations to __clear_user()
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@arm.com> Link: https://lore.kernel.org/all/20230321122514.1743889-3-mark.rutland@arm.com/ Cc: stable@vger.kernel.org Reviewed-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/lib/uaccess.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/lib/uaccess.c b/arch/s390/lib/uaccess.c
index 720036fb1924..d44214072779 100644
--- a/arch/s390/lib/uaccess.c
+++ b/arch/s390/lib/uaccess.c
@@ -172,7 +172,7 @@ unsigned long __clear_user(void __user *to, unsigned long size)
"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;