jump_label: get rid of NOP patching where possible
Status from this message: The following commit has been merged into the locking/core branch of tip:
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- v2 Latest3 patches 5 repliesApplied
- v13 patches 4 repliesSuperseded
Changes in v2 from the cover letter
- use a default implementation of arch_jump_label_transform_static() instead of an empty macro in patch #3
- fix MIPS with CONFIG_MODULES=n
- add acks from Mark and Peter to patch #3
Patches in v2 Applied
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/3 | jump_label: s390: avoid pointless initial NOP patchingarch/ arch/ | +7 | 1 reply | |
| 2/3 | jump_label: mips: move module NOP patching into arch codearch/ arch/ arch/ +4 more | +24 | 1 reply | |
| 3/3 | jump_label: make initial NOP patching the special caseDocumentation/ arch/ arch/ +7 more | +7 | 3 replies |
Reviews trailers per patch
All 3 patches have a Reviewed-by or Acked-by.
| Patch | Mark Rutland | Peter Zijlstra (Intel) | Alexander Gordeev |
|---|---|---|---|
| 1/3 | A-b | ||
| 2/3 | A-b | ||
| 3/3 | A-b | A-b | A-b |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes. Scroll the table sideways for all 3 reviewers.
Cover letter [PATCH v2 0/3] jump_label: get rid of NOP patching where possible
The only architecture that actually needs to convert compiler generated jump label NOP encodings into something else at runtime is MIPS, because the assembler cannot be trusted to emit a sequence that can be safely patched into a branch instruction.
All other architectures either do nothing with jump label NOPs at load time, or patch a perfectly good NOP into a different one, or into the same one - none of this seems very useful, so let's get rid of it where we can.
Changes since v1:
- use a default implementation of arch_jump_label_transform_static() instead of an empty macro in patch #3
- fix MIPS with CONFIG_MODULES=n
- add acks from Mark and Peter to patch #3
Ard Biesheuvel (3):
jump_label: s390: avoid pointless initial NOP patching
jump_label: mips: move module NOP patching into arch code
jump_label: make initial NOP patching the special case
Documentation/staging/static-keys.rst | 3 -- arch/arc/kernel/jump_label.c | 13 ------- arch/arm/kernel/jump_label.c | 6 --- arch/arm64/kernel/jump_label.c | 11 ------ arch/mips/include/asm/jump_label.h | 2 + arch/mips/kernel/jump_label.c | 19 +++++++++ arch/mips/kernel/module.c | 5 ++- arch/parisc/kernel/jump_label.c | 11 ------ arch/riscv/kernel/jump_label.c | 12 ------ arch/s390/include/asm/jump_label.h | 5 +-- arch/s390/kernel/jump_label.c | 28 +++---------- arch/s390/kernel/module.c | 1 - arch/sparc/kernel/module.c | 3 -- arch/x86/kernel/jump_label.c | 13 ------- arch/x86/kernel/module.c | 3 -- include/linux/jump_label.h | 7 +--- kernel/jump_label.c | 41 +++----------------- 17 files changed, 38 insertions(+), 145 deletions(-)
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