shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-05 02:21:52 +09:00
Code Issues Packages Projects Releases Wiki Activity

s390/vtime: fix inline assembly clobber list

Browse Source 
commit b29c509382 upstream.

The stck/stckf instruction used within the inline assembly within
do_account_vtime() changes the condition code. This is not reflected
with the clobber list, and therefore might result in incorrect code
generation.

It seems unlikely that the compiler could generate incorrect code
considering the surrounding C code, but it must still be fixed.

Cc: <stable@vger.kernel.org>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heiko Carstens
2021-02-02 16:45:37 +01:00
committed by Greg Kroah-Hartman
parent 13fb0e1ecf
commit 93c5029fb8
1 changed files with 2 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
arch/s390/kernel/vtime.c
View File

@@ -136,7 +136,8 @@ static int do_account_vtime(struct task_struct *tsk)
" stck %1" /* Store current tod clock value */
#endif
: "=Q" (S390_lowcore.last_update_timer),
"=Q" (S390_lowcore.last_update_clock));
"=Q" (S390_lowcore.last_update_clock)
: : "cc");
clock = S390_lowcore.last_update_clock - clock;
timer -= S390_lowcore.last_update_timer;