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| author | Heiko Carstens <hca@linux.ibm.com> | 2025-03-10 12:33:41 +0300 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2025-03-18 19:13:04 +0300 |
| commit | b46525437e1728596fda558894011ce64e5b0a9f (patch) | |
| tree | c24a8fba989d8568035626c48808879367df4a2d /rust/helpers/helpers.c | |
| parent | 4797e9b5067e3682020b3f6745a929d690370be3 (diff) | |
| download | linux-b46525437e1728596fda558894011ce64e5b0a9f.tar.xz | |
s390/spinlock: Implement SPINLOCK_LOCKVAL with inline assembly
Implement SPINLOCK_LOCKVAL with an inline assembly, which makes use of the
ALTERNATIVE macro, to read spinlock_lockval from lowcore. Provide an
alternative instruction with a different offset in case lowcore is
relocated.
This replaces sequences of two instructions with one instruction.
Before:
10602a: a7 78 00 00 lhi %r7,0
10602e: a5 8e 00 00 llilh %r8,0
106032: 58 d0 83 ac l %r13,940(%r8)
106036: ba 7d b5 80 cs %r7,%r13,1408(%r11)
After:
10602a: a7 88 00 00 lhi %r8,0
10602e: e3 70 03 ac 00 58 ly %r7,940
106034: ba 87 b5 80 cs %r8,%r7,1408(%r11)
Kernel image size change:
add/remove: 756/750 grow/shrink: 646/3435 up/down: 30778/-46326 (-15548)
Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'rust/helpers/helpers.c')
0 files changed, 0 insertions, 0 deletions