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[S390] add support for nonquiescing sske

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Improve performance of the sske operation by using the nonquiescing
variant if the affected page has no mappings established. On machines
with no support for the new sske variant the mask bit will be ignored.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2010-10-25 16:10:14 +02:00
committed by Martin Schwidefsky
parent 92f842eac7
commit e2b8d7af0e
7 changed files with 18 additions and 12 deletions
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include/linux/page-flags.h
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@@ -310,7 +310,7 @@ static inline void SetPageUptodate(struct page *page)
{
#ifdef CONFIG_S390
if (!test_and_set_bit(PG_uptodate, &page->flags))
page_clear_dirty(page);
page_clear_dirty(page, 0);
#else
/*
* Memory barrier must be issued before setting the PG_uptodate bit,