Re: [PATCH v10 02/25] x86/mm: define ARCH_SUPPORTS_SPECULATIVE_PAGE_FAULT
From: Punit Agrawal <hidden>
Date: 2018-05-08 11:04:36
Also in:
linux-mm, lkml
Hi Laurent, Laurent Dufour [off-list ref] writes:
quoted hunk
Set ARCH_SUPPORTS_SPECULATIVE_PAGE_FAULT which turns on the Speculative Page Fault handler when building for 64bit. Cc: Thomas Gleixner <redacted> Signed-off-by: Laurent Dufour <redacted> --- arch/x86/Kconfig | 1 + 1 file changed, 1 insertion(+)diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index d8983df5a2bc..ebdeb48e4a4a 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig@@ -30,6 +30,7 @@ config X86_64 select MODULES_USE_ELF_RELA select X86_DEV_DMA_OPS select ARCH_HAS_SYSCALL_WRAPPER + select ARCH_SUPPORTS_SPECULATIVE_PAGE_FAULT
I'd suggest merging this patch with the one making changes to the architectural fault handler towards the end of the series. The Kconfig change is closely tied to the architectural support for SPF and makes sense to be in a single patch. If there's a good reason to keep them as separate patches, please move the architecture Kconfig changes after the patch adding fault handler changes. It's better to enable the feature once the core infrastructure is merged rather than at the beginning of the series to avoid potential bad fallout from incomplete functionality during bisection. All the comments here definitely hold for the arm64 patches that you plan to include with the next update. Thanks, Punit
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