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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2018-06-21 15:49:38 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-06-25 11:07:12 +0300 |
| commit | 891f6a726cacbb87e5b06076693ffab53bd378d7 (patch) | |
| tree | b3fba7233d00da1bcb81a67ac04b73a997e40d16 /arch/s390/include/asm/qdio.h | |
| parent | 7daf201d7fe8334e2d2364d4e8ed3394ec9af819 (diff) | |
| download | linux-891f6a726cacbb87e5b06076693ffab53bd378d7.tar.xz | |
s390: Correct register corruption in critical section cleanup
In the critical section cleanup we must not mess with r1. For march=z9
or older, larl + ex (instead of exrl) are used with r1 as a temporary
register. This can clobber r1 in several interrupt handlers. Fix this by
using r11 as a temp register. r11 is being saved by all callers of
cleanup_critical.
Fixes: 6dd85fbb87 ("s390: move expoline assembler macros to a header")
Cc: stable@vger.kernel.org #v4.16
Reported-by: Oliver Kurz <okurz@suse.com>
Reported-by: Petr Tesařík <ptesarik@suse.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/qdio.h')
0 files changed, 0 insertions, 0 deletions