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authorStas Sergeev <stsp@list.ru>2014-09-09 14:50:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-09-10 15:42:12 -0700
commitcaac7e6d00d3ddc888bd8169e75a02f962efdcff (patch)
tree5ec62f272828ee9da5786013e37a586ae78692fc /arch/sh
parentc680e41b3a2e944185c74bf60531e3d316d3ecc4 (diff)
downloadlinux-caac7e6d00d3ddc888bd8169e75a02f962efdcff.tar.gz
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')
-rw-r--r--arch/sh/mm/gup.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/sh/mm/gup.c b/arch/sh/mm/gup.c
index bf8daf9d9c9..37458f38b22 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)++;