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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	"James E.J. Bottomley" <James.Bottomley@hansenpartnership.com>,
	Russell King <linux@armlinux.org.uk>, Guo Ren <guoren@kernel.org>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Nick Hu <nickhu@andestech.com>, Greentime Hu <green.hu@gmail.com>,
	Vincent Chen <deanbo422@gmail.com>, Helge Deller <deller@gmx.de>,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	Rich Felker <dalias@libc.org>, Geoff Levand <geoff@infradead.org>,
	Paul Cercueil <paul@crapouillou.net>,
	Ulf Hansson <ulf.hansson@linaro.org>, Alex Shi <alexs@kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	linux-csky@vger.kernel.org,
	"open list:BROADCOM NVRAM DRIVER" <linux-mips@vger.kernel.org>,
	linux-parisc@vger.kernel.org,
	Linux-sh list <linux-sh@vger.kernel.org>,
	linux-mmc@vger.kernel.org,
	linux-scsi <linux-scsi@vger.kernel.org>,
	Linux-MM <linux-mm@kvack.org>,
	"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>
Subject: Re: flush_kernel_dcache_page fixes and removal
Date: Mon, 12 Jul 2021 12:24:11 -0700	[thread overview]
Message-ID: <CAHk-=whd0GaAH7gHuEiuKjOeD6JGKY1q5ydG1TCKjVBFNBUEJA@mail.gmail.com> (raw)
In-Reply-To: <20210712060928.4161649-1-hch@lst.de>

On Sun, Jul 11, 2021 at 11:09 PM Christoph Hellwig <hch@lst.de> wrote:
>
> I think we should just remove it and eat the very minor overhead in
> exec rather than confusing poor driver writers.

Ack.

I think architectures that have virtual caches might want to think
about this patch a bit more, but on the whole I can't argue against
the "it's badly documented and misused".

No sane architecture will care, since dcache will be coherent (there
are more issues on the I$ side, but that's a different issue)

              Linus

WARNING: multiple messages have this Message-ID (diff)
From: Linus Torvalds <torvalds@linux-foundation.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	 "James E.J. Bottomley" <James.Bottomley@hansenpartnership.com>,
	 Russell King <linux@armlinux.org.uk>,
	Guo Ren <guoren@kernel.org>,
	 Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Nick Hu <nickhu@andestech.com>, Greentime Hu <green.hu@gmail.com>,
	Vincent Chen <deanbo422@gmail.com>, Helge Deller <deller@gmx.de>,
	 Yoshinori Sato <ysato@users.sourceforge.jp>,
	Rich Felker <dalias@libc.org>,
	 Geoff Levand <geoff@infradead.org>,
	Paul Cercueil <paul@crapouillou.net>,
	 Ulf Hansson <ulf.hansson@linaro.org>,
	Alex Shi <alexs@kernel.org>,
	 Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	 Linux ARM <linux-arm-kernel@lists.infradead.org>,
	linux-csky@vger.kernel.org,
	 "open list:BROADCOM NVRAM DRIVER" <linux-mips@vger.kernel.org>,
	linux-parisc@vger.kernel.org,
	 Linux-sh list <linux-sh@vger.kernel.org>,
	linux-mmc@vger.kernel.org,
	 linux-scsi <linux-scsi@vger.kernel.org>,
	Linux-MM <linux-mm@kvack.org>,
	 "open list:DOCUMENTATION" <linux-doc@vger.kernel.org>
Subject: Re: flush_kernel_dcache_page fixes and removal
Date: Mon, 12 Jul 2021 12:24:11 -0700	[thread overview]
Message-ID: <CAHk-=whd0GaAH7gHuEiuKjOeD6JGKY1q5ydG1TCKjVBFNBUEJA@mail.gmail.com> (raw)
In-Reply-To: <20210712060928.4161649-1-hch@lst.de>

On Sun, Jul 11, 2021 at 11:09 PM Christoph Hellwig <hch@lst.de> wrote:
>
> I think we should just remove it and eat the very minor overhead in
> exec rather than confusing poor driver writers.

Ack.

I think architectures that have virtual caches might want to think
about this patch a bit more, but on the whole I can't argue against
the "it's badly documented and misused".

No sane architecture will care, since dcache will be coherent (there
are more issues on the I$ side, but that's a different issue)

              Linus

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2021-07-12 19:24 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-12  6:09 flush_kernel_dcache_page fixes and removal Christoph Hellwig
2021-07-12  6:09 ` Christoph Hellwig
2021-07-12  6:09 ` [PATCH 1/6] mmc: JZ4740: remove the flush_kernel_dcache_page call in jz4740_mmc_read_data Christoph Hellwig
2021-07-12  6:09   ` Christoph Hellwig
2021-07-19  8:15   ` Paul Cercueil
2021-07-19  8:15     ` Paul Cercueil
2021-08-04 11:12   ` Ulf Hansson
2021-08-04 11:12     ` Ulf Hansson
2021-08-04 11:12     ` Ulf Hansson
2021-07-12  6:09 ` [PATCH 2/6] mmc: mmc_spi: replace flush_kernel_dcache_page with flush_dcache_page Christoph Hellwig
2021-07-12  6:09   ` Christoph Hellwig
2021-08-04 11:12   ` Ulf Hansson
2021-08-04 11:12     ` Ulf Hansson
2021-08-04 11:12     ` Ulf Hansson
2021-07-12  6:09 ` [PATCH 3/6] ps3disk: " Christoph Hellwig
2021-07-12  6:09   ` Christoph Hellwig
2021-07-19  3:07   ` Geoff Levand
2021-07-19  3:07     ` Geoff Levand
2021-07-12  6:09 ` [PATCH 4/6] scatterlist: " Christoph Hellwig
2021-07-12  6:09   ` Christoph Hellwig
2021-07-12  6:09 ` [PATCH 5/6] aacraid: remove an unused include Christoph Hellwig
2021-07-12  6:09   ` Christoph Hellwig
2021-07-19  1:50   ` Martin K. Petersen
2021-07-19  1:50     ` Martin K. Petersen
2021-07-12  6:09 ` [PATCH 6/6] mm: remove flush_kernel_dcache_page Christoph Hellwig
2021-07-12  6:09   ` Christoph Hellwig
2021-07-12 23:56   ` Ira Weiny
2021-07-12 23:56     ` Ira Weiny
2021-07-12 19:24 ` Linus Torvalds [this message]
2021-07-12 19:24   ` flush_kernel_dcache_page fixes and removal Linus Torvalds
2021-07-12 19:24   ` Linus Torvalds
2021-07-13  5:46   ` Christoph Hellwig
2021-07-13  5:46     ` Christoph Hellwig
2021-07-13  8:46 ` Russell King (Oracle)
2021-07-13  8:46   ` Russell King (Oracle)
2021-07-13  9:11   ` Christoph Hellwig
2021-07-13  9:11     ` Christoph Hellwig
2021-07-19  5:38   ` Herbert Xu
2021-07-19  5:38     ` Herbert Xu
2021-07-19 15:42     ` Russell King (Oracle)
2021-07-19 15:42       ` Russell King (Oracle)
2021-07-14  3:13 ` Guo Ren
2021-07-14  3:13   ` Guo Ren
2021-07-14  3:13   ` Guo Ren

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