get_user_pages_fast() is missing cache flushes for MIPS platforms with cache alias. Filesystem failures observed with DirectIO operations due to missing flush_anon_page() that use page coloring logic to work with cache aliases. This fix falls through to take slow_irqon path that calls get_user_pages() that has required logic for platforms where cpu_has_dc_aliases is true. Signed-off-by: Kamal Dasu <kdasu.kdev@xxxxxxxxx> --- arch/mips/mm/gup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/mips/mm/gup.c b/arch/mips/mm/gup.c index d4ea5c9..346fb7e 100644 --- a/arch/mips/mm/gup.c +++ b/arch/mips/mm/gup.c @@ -273,7 +273,7 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write, len = (unsigned long) nr_pages << PAGE_SHIFT; end = start + len; - if (end < start) + if (end < start || cpu_has_dc_aliases) goto slow_irqon; /* XXX: batch / limit 'nr' */ -- 1.8.2.3
