Re: [PATCH 6/8] arm64: Introduce raw_{d,i}cache_line_size

From	Will Deacon <will.deacon@arm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 6/8] arm64: Introduce raw_{d,i}cache_line_size
Date	2016-08-22 12:10 +0200
Message-ID	<s8Ul3-4Vk-31@gated-at.bofh.it> (permalink)
References	<s7voJ-ho-3@gated-at.bofh.it> <s7voL-ho-75@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, Aug 18, 2016 at 02:10:30PM +0100, Suzuki K Poulose wrote:
> On systems with mismatched i/d cache min line sizes, we need to use
> the smallest size possible across all CPUs. This will be done by fetching
> the system wide safe value from CPU feature infrastructure.
> However the some special users(e.g kexec, hibernate) would need the line
> size on the CPU (rather than the system wide), when the system wide
> feature may not be accessible. Provide another helper which will fetch
> cache line size on the current CPU.

Why are these users "special"? Using a smaller line size shouldn't affect
correctness, and I don't see kexec and hibernate as being performance
critical in their cache maintenance.

Will

Thread

[RESEND] [PATCH 0/8] arm64: Work around for mismatched cache line size Suzuki K Poulose <suzuki.poulose@arm.com> - 2016-08-18 15:20 +0200
  [PATCH 6/8] arm64: Introduce raw_{d,i}cache_line_size Suzuki K Poulose <suzuki.poulose@arm.com> - 2016-08-18 15:20 +0200
    Re: [PATCH 6/8] arm64: Introduce raw_{d,i}cache_line_size Geoff Levand <geoff@infradead.org> - 2016-08-19 03:20 +0200
    Re: [PATCH 6/8] arm64: Introduce raw_{d,i}cache_line_size Will Deacon <will.deacon@arm.com> - 2016-08-22 12:10 +0200
      Re: [PATCH 6/8] arm64: Introduce raw_{d,i}cache_line_size Suzuki K Poulose <Suzuki.Poulose@arm.com> - 2016-08-23 12:20 +0200
  [PATCH 4/8] arm64: insn: Add helpers for adrp offsets Suzuki K Poulose <suzuki.poulose@arm.com> - 2016-08-18 15:30 +0200
    Re: [PATCH 4/8] arm64: insn: Add helpers for adrp offsets Marc Zyngier <marc.zyngier@arm.com> - 2016-08-18 16:50 +0200
      Re: [PATCH 4/8] arm64: insn: Add helpers for adrp offsets Suzuki K Poulose <Suzuki.Poulose@arm.com> - 2016-08-19 03:00 +0200

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