linux-kernel - Re: [PATCH v2] asm-generic: introduce io_stop

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Message-Id: <164017237365.157899.5054701495946891448.b4-ty@arm.com>
Date:   Wed, 22 Dec 2021 11:26:28 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     will@...nel.org, Xiongfeng Wang <wangxiongfeng2@...wei.com>,
        corbet@....net, mark.rutland@....com, peterz@...radead.org
Cc:     moyufeng@...wei.com, linux-doc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] asm-generic: introduce io_stop_wc() and add implementation for ARM64

On Tue, 21 Dec 2021 11:55:56 +0800, Xiongfeng Wang wrote:
> For memory accesses with write-combining attributes (e.g. those returned
> by ioremap_wc()), the CPU may wait for prior accesses to be merged with
> subsequent ones. But in some situation, such wait is bad for the
> performance.
> 
> We introduce io_stop_wc() to prevent the merging of write-combining
> memory accesses before this macro with those after it.
> 
> [...]

Applied to arm64 (for-next/misc), thanks!

[1/1] asm-generic: introduce io_stop_wc() and add implementation for ARM64
      https://git.kernel.org/arm64/c/d5624bb29f49

-- 
Catalin