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| author | Peter Zijlstra <peterz@infradead.org> | 2022-09-15 13:10:47 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-10-17 16:40:58 +0200 |
| commit | d49a0626216b95cd4bf696f6acf55f39a16ab0bb (patch) | |
| tree | 52349000d2ed416b132b74e58c9f005b9a51211c /lib | |
| parent | 24a9c543d2114d416f84e386c2fa90089bd97e4c (diff) | |
| download | linux-stable-d49a0626216b95cd4bf696f6acf55f39a16ab0bb.tar.gz linux-stable-d49a0626216b95cd4bf696f6acf55f39a16ab0bb.tar.bz2 linux-stable-d49a0626216b95cd4bf696f6acf55f39a16ab0bb.zip | |
arch: Introduce CONFIG_FUNCTION_ALIGNMENT
Generic function-alignment infrastructure.
Architectures can select FUNCTION_ALIGNMENT_xxB symbols; the
FUNCTION_ALIGNMENT symbol is then set to the largest such selected
size, 0 otherwise.
From this the -falign-functions compiler argument and __ALIGN macro
are set.
This incorporates the DEBUG_FORCE_FUNCTION_ALIGN_64B knob and future
alignment requirements for x86_64 (later in this series) into a single
place.
NOTE: also removes the 0x90 filler byte from the generic __ALIGN
primitive, that value makes no sense outside of x86.
NOTE: .balign 0 reverts to a no-op.
Requested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220915111143.719248727@infradead.org
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 3fc7abffc7aa..e90dc6738534 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -467,6 +467,7 @@ config SECTION_MISMATCH_WARN_ONLY config DEBUG_FORCE_FUNCTION_ALIGN_64B bool "Force all function address 64B aligned" depends on EXPERT && (X86_64 || ARM64 || PPC32 || PPC64 || ARC) + select FUNCTION_ALIGNMENT_64B help There are cases that a commit from one domain changes the function address alignment of other domains, and cause magic performance |