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authorPeter Zijlstra <peterz@infradead.org>2022-09-15 13:10:47 +0200
committerPeter Zijlstra <peterz@infradead.org>2022-10-17 16:40:58 +0200
commitd49a0626216b95cd4bf696f6acf55f39a16ab0bb (patch)
tree52349000d2ed416b132b74e58c9f005b9a51211c /lib
parent24a9c543d2114d416f84e386c2fa90089bd97e4c (diff)
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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.debug1
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