LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Christoph Hellwig <hch@lst.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Ira Weiny <ira.weiny@intel.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: fix memcpy_to_page and memzero_page
Date: Tue, 13 Jul 2021 07:52:29 +0200	[thread overview]
Message-ID: <20210713055231.137602-1-hch@lst.de> (raw)

Hi all,

we need to call flush_dcache_page on any kmapped page, and on any page
we write to that may be mapped into the page cache, which can happen
quite frequently for anything we use raw pages for.

Patch 1 make sure memcpy_to_page and memzero_page to do the right thing
for that, and patch 2 fixes up the lost switch to kmap_local_page for
memzero_page.

             reply	other threads:[~2021-07-13  5:53 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-13  5:52 Christoph Hellwig [this message]
2021-07-13  5:52 ` [PATCH 1/2] mm: call flush_dcache_page in " Christoph Hellwig
2021-07-14  1:31   ` Andrew Morton
2021-07-14  5:28     ` Christoph Hellwig
2021-07-14  8:09   ` Ira Weiny
2021-07-13  5:52 ` [PATCH 2/2] mm: use kmap_local_page in memzero_page Christoph Hellwig

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210713055231.137602-1-hch@lst.de \
    --to=hch@lst.de \
    --cc=akpm@linux-foundation.org \
    --cc=ira.weiny@intel.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --subject='Re: fix memcpy_to_page and memzero_page' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).