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Commit df2f5e72 authored by Russell King's avatar Russell King Committed by Russell King
Browse files

[ARM SMP] Disable lazy flush_dcache_page for SMP 



Lazy flush_dcache_page() causes userspace instability on SMP
platforms, so disable it for now.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent d2ef5ebb

arch/arm/mm/flush.c

+6 −1
Original line number Original line Diff line number Diff line
@@ -155,14 +155,19 @@ static void __flush_dcache_aliases(struct address_space *mapping, struct page *p 
 *  space mappings, we can be lazy and remember that we may have dirty

 *  space mappings, we can be lazy and remember that we may have dirty

 *  kernel cache lines for later.  Otherwise, we assume we have

 *  kernel cache lines for later.  Otherwise, we assume we have

 *  aliasing mappings.

 *  aliasing mappings.

 *

 * Note that we disable the lazy flush for SMP.

 */

 */

void flush_dcache_page(struct page *page)

void flush_dcache_page(struct page *page)

{

{

	struct address_space *mapping = page_mapping(page);

	struct address_space *mapping = page_mapping(page);





#ifndef CONFIG_SMP

	if (mapping && !mapping_mapped(mapping))

	if (mapping && !mapping_mapped(mapping))

		set_bit(PG_dcache_dirty, &page->flags);

		set_bit(PG_dcache_dirty, &page->flags);

	else {

	else

#endif

	{

		__flush_dcache_page(mapping, page);

		__flush_dcache_page(mapping, page);

		if (mapping && cache_is_vivt())

		if (mapping && cache_is_vivt())

			__flush_dcache_aliases(mapping, page);

			__flush_dcache_aliases(mapping, page);