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| author |   Stas Sergeev <stsp@list.ru> | 2014-09-09 14:50:53 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2014-09-10 15:42:12 -0700 |
| commit | caac7e6d00d3ddc888bd8169e75a02f962efdcff (patch) | |
| tree | 5ec62f272828ee9da5786013e37a586ae78692fc /arch/sh/mm | |
| parent | eventpoll: fix uninitialized variable in epoll_ctl (diff) | |
| download | linux-dev-caac7e6d00d3ddc888bd8169e75a02f962efdcff.tar.xz linux-dev-caac7e6d00d3ddc888bd8169e75a02f962efdcff.zip | |
sh: get_user_pages_fast() must flush cache
This patch avoids fuse hangs on sh4 by flushing the cache on
get_user_pages_fast(). This is not necessary a good thing to do, but
get_user_pages() does this, so get_user_pages_fast() should too.
Please note the patch for mips arch that addresses the similar problem:
https://kernel.googlesource.com/pub/scm/linux/kernel/git/ralf/linux/+/linux-3.4.50%5E!/#F0
They basically simply disable get_user_pages_fast() at all, using a
fall-back to get_user_pages(). But my fix is different, it adds an
explicit cache flushes.
Signed-off-by: Stas Sergeev <stsp@users.sourceforge.net>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Kamal Dasu <kdasu.kdev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/sh/mm')
| -rw-r--r-- | arch/sh/mm/gup.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/sh/mm/gup.c b/arch/sh/mm/gup.c index bf8daf9d9c9b..37458f38b220 100644 --- a/arch/sh/mm/gup.c +++ b/arch/sh/mm/gup.c @@ -105,6 +105,8 @@ static noinline int gup_pte_range(pmd_t pmd, unsigned long addr, VM_BUG_ON(!pfn_valid(pte_pfn(pte))); page = pte_page(pte); get_page(page); + __flush_anon_page(page, addr); + flush_dcache_page(page); pages[*nr] = page; (*nr)++; |