This patch set proposes an improved fix for the race condition that
originally was fixed in commit 2a4a8b1e5d9d ("MIPS: Remove race window
in page fault handling").I have used the flush_icache_page API that is marked as deprecated in Documentation/cachetlb.txt. There are strong reasons to keep this API because it is not possible to implement an efficient and race-free lazy flushing using the other APIs. You can refer to a discussion about the same issue in arch/arm where they chose to implement the solution in set_pte_at. In arch/mips we could not do this because we lack information about the executability of the mapping in set_pte_at() and thus we would have to flush all pages to be safe. http://lists.infradead.org/pipermail/linux-arm-kernel/2010-November/030915.html Lars Persson (2): Revert "MIPS: Remove race window in page fault handling" MIPS: Fix race condition in lazy cache flushing. arch/mips/include/asm/cacheflush.h | 35 ++++++++++++++++++++--------------- arch/mips/include/asm/pgtable.h | 10 ++++++---- arch/mips/mm/cache.c | 27 ++++++++------------------- 3 files changed, 34 insertions(+), 38 deletions(-) -- 1.7.10.4 -- 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/
