Page 'new' during MIGRATION can't be flushed by flush_cache_page(). Using flush_cache_page(vma, addr, pfn) is justified only if page is already placed in process page table, and that is done right after flush_cache_page(). But without it the arch function has no knowledge of process PTE and does nothing.
Besides that, flush_cache_page() flushes an application cache, kernel has a different page virtual address and dirtied it. Replace it with flush_dcache_page(new) which is a proper usage. Old page is flushed in try_to_unmap_one() before MIGRATION. This bug takes place in Sead3 board with M14Kc MIPS CPU without cache aliasing (but Harvard arch - separate I and D cache) in tight memory environment (128MB) each 1-3days on SOAK test. It fails in cc1 during kernel build (SIGILL, SIGBUS, SIGSEG) if CONFIG_COMPACTION is switched ON. Author: Leonid Yegoshin <yegos...@mips.com> Signed-off-by: Leonid Yegoshin <leonid.yegos...@imgtec.com> --- mm/migrate.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/mm/migrate.c b/mm/migrate.c index 2fd8b4a..4c6250a 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -165,7 +165,7 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma, pte = arch_make_huge_pte(pte, vma, new, 0); } #endif - flush_cache_page(vma, addr, pte_pfn(pte)); + flush_dcache_page(new); set_pte_at(mm, addr, ptep, pte); if (PageHuge(new)) { -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/