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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2019-11-18 09:38:37 +0100 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2019-11-30 10:52:44 +0100 |
| commit | 5a5525b0488ce31e19065f8527dbf50266b5b712 (patch) | |
| tree | 962f0b570a299c36ea29f9dd2cb14943b488ca68 /scripts/patch-kernel | |
| parent | a2308c11ecbc3471ebb7435ee8075815b1502ef0 (diff) | |
| download | kernel-5a5525b0488ce31e19065f8527dbf50266b5b712.tar.gz | |
s390/vdso: fix getcpu
getcpu reads the required values for cpu and node with two
instructions. This might lead to an inconsistent result if user space
gets preempted and migrated to a different CPU between the two
instructions.
Fix this by using just a single instruction to read both values at
once.
This is currently rather a theoretical bug, since there is no real
NUMA support available (except for NUMA emulation).
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'scripts/patch-kernel')
0 files changed, 0 insertions, 0 deletions