linux-kernel - [PATCH 0/3]nds32: Correct the cache operation for catch aliasing case

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Message-ID: <1526373963-12417-1-git-send-email-vincentc@andestech.com>
Date:   Tue, 15 May 2018 16:46:00 +0800
From:   Vincent Chen <vincentc@...estech.com>
To:     <linux-kernel@...r.kernel.org>, <green.hu@...il.com>,
        <greentime@...estech.com>, <arnd@...db.de>
CC:     <deanbo422@...il.com>, <vincentc@...estech.com>
Subject: [PATCH 0/3]nds32: Correct the cache operation for catch aliasing case

The following 3 issues are fixed in this patchset

1. In function flush_dacache_page and copy_user_highpage, the local irq is
enabled when the cache of the page at address page_address(page) is written
back to memory. It possibly causes data corruption. To fix this problem,
the local irq is disabled before executing d-cache write-back and
invalidate in this patchset.

2. According to Documentation/cachetlb.txt, the cache of the page at vmaddr
shall be flushed in flush_anon_page instead of the cache of the page at
page_address(page). We correct it and add the modification to this
patchset.

3. Removing unneeded cache invalidation in copy_user_highpage function.

Vincent Chen (3):
  nds32: Correct flush_dcache_page function
  nds32: Flush the cache of the page at vmaddr instead of kaddr in
    flush_anon_page
  nds32: Disable local irq before calling cpu_dcache_wb_page in
    copy_user_highpage

 arch/nds32/mm/cacheflush.c |   34 ++++++++++++++++++++--------------
 1 files changed, 20 insertions(+), 14 deletions(-)