diff options
| author | Andrea Arcangeli <aarcange@redhat.com> | 2011-11-03 00:37:03 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-11 21:36:45 +0400 |
| commit | 45a2755f0fd17acf45c7cea183815c65f28154c3 (patch) | |
| tree | 3b9347732e79a4150560a6e92270387aa5bdee3b /arch/powerpc | |
| parent | 8adc3d3df0562b8dc4008f458081dcc2d8b98863 (diff) | |
| download | linux-45a2755f0fd17acf45c7cea183815c65f28154c3.tar.xz | |
powerpc: remove superfluous PageTail checks on the pte gup_fast
commit 2839bdc1bfc0af76a2f0f11eca011590520a04fa upstream.
This part of gup_fast doesn't seem capable of handling hugetlbfs ptes,
those should be handled by gup_hugepd only, so these checks are
superfluous.
Plus if this wasn't a noop, it would have oopsed because, the insistence
of using the speculative refcounting would trigger a VM_BUG_ON if a tail
page was encountered in the page_cache_get_speculative().
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <jweiner@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/mm/gup.c | 13 |
1 files changed, 0 insertions, 13 deletions
diff --git a/arch/powerpc/mm/gup.c b/arch/powerpc/mm/gup.c index b9e1c7ff5f6d..d7efdbf640c7 100644 --- a/arch/powerpc/mm/gup.c +++ b/arch/powerpc/mm/gup.c @@ -16,17 +16,6 @@ #ifdef __HAVE_ARCH_PTE_SPECIAL -static inline void get_huge_page_tail(struct page *page) -{ - /* - * __split_huge_page_refcount() cannot run - * from under us. - */ - VM_BUG_ON(page_mapcount(page) < 0); - VM_BUG_ON(atomic_read(&page->_count) != 0); - atomic_inc(&page->_mapcount); -} - /* * The performance critical leaf functions are made noinline otherwise gcc * inlines everything into a single function which results in too much @@ -58,8 +47,6 @@ static noinline int gup_pte_range(pmd_t pmd, unsigned long addr, put_page(page); return 0; } - if (PageTail(page)) - get_huge_page_tail(page); pages[*nr] = page; (*nr)++; |