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[S390] merge page_test_dirty and page_clear_dirty

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The page_clear_dirty primitive always sets the default storage key
which resets the access control bits and the fetch protection bit.
That will surprise a KVM guest that sets non-zero access control
bits or the fetch protection bit. Merge page_test_dirty and
page_clear_dirty back to a single function and only clear the
dirty bit from the storage key.

In addition move the function page_test_and_clear_dirty and
page_test_and_clear_young to page.h where they belong. This
requires to change the parameter from a struct page * to a page
frame number.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2011-05-23 10:24:39 +02:00
parent c26001d4e9
commit 2d42552d1c
5 changed files with 68 additions and 71 deletions
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2
include/linux/page-flags.h
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@ -308,7 +308,7 @@ static inline void SetPageUptodate(struct page *page)
{
#ifdef CONFIG_S390
if (!test_and_set_bit(PG_uptodate, &page->flags))
page_clear_dirty(page, 0);
page_set_storage_key(page_to_pfn(page), PAGE_DEFAULT_KEY, 0);
#else
/*
* Memory barrier must be issued before setting the PG_uptodate bit,