jump_label: make initial NOP patching the special case

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Instead of defaulting to patching NOP opcodes at init time, and leaving
it to the architectures to override this if this is not needed, switch
to a model where doing nothing is the default. This is the common case
by far, as only MIPS requires NOP patching at init time. On all other
architectures, the correct encodings are emitted by the compiler and so
no initial patching is needed.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220615154142.1574619-4-ardb@kernel.org

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Ard Biesheuvel 2022-06-15 17:41:42 +02:00 • committed by Peter Zijlstra

parent fdfd42892f

commit 7e6b9db27d

11 changed files with 7 additions and 85 deletions

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3

Documentation/staging/static-keys.rst

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13

arch/arc/kernel/jump_label.c

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arch/arm/kernel/jump_label.c

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arch/arm64/kernel/jump_label.c

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arch/mips/include/asm/jump_label.h

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arch/parisc/kernel/jump_label.c

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arch/riscv/kernel/jump_label.c

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arch/s390/kernel/jump_label.c

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arch/x86/kernel/jump_label.c

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include/linux/jump_label.h

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kernel/jump_label.c

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