Messages in this thread | | | Date | Wed, 27 Jan 2016 11:35:48 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH v2 resend 6/6] arm64: switch to relative exception tables |
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On Wed, 27 Jan 2016 11:55:23 +0100 Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote:
> Instead of using absolute addresses for both the exception location > and the fixup, use offsets relative to the exception table entry values. > Not only does this cut the size of the exception table in half, it is > also a prerequisite for KASLR, since absolute exception table entries > are subject to dynamic relocation, which is incompatible with the sorting > of the exception table that occurs at build time. > > This patch also introduces the _ASM_EXTABLE preprocessor macro (which > exists on x86 as well) and its _asm_extable assembly counterpart, as > shorthands to emit exception table entries.
checkpatch speaketh truth:
ERROR: #define of 'ARCH_HAS_RELATIVE_EXTABLE' is wrong - use Kconfig variables or standard guards instead #113: FILE: arch/arm64/include/asm/uaccess.h:56:
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