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arch: Introduce CONFIG_FUNCTION_ALIGNMENT

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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
This commit is contained in:
Peter Zijlstra
2022-09-15 13:10:47 +02:00
parent 24a9c543d2
commit d49a062621
10 changed files with 44 additions and 10 deletions
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4
include/linux/linkage.h
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@@ -69,8 +69,8 @@
#endif
#ifndef __ALIGN
#define __ALIGN .align 4,0x90
#define __ALIGN_STR ".align 4,0x90"
#define __ALIGN .balign CONFIG_FUNCTION_ALIGNMENT
#define __ALIGN_STR __stringify(__ALIGN)
#endif
#ifdef __ASSEMBLY__