From 74d00a8c3849c1340efd713eb94b786e304c201f Mon Sep 17 00:00:00 2001 From: John Crispin Date: Sun, 25 Dec 2016 20:11:34 +0100 Subject: kernel: split patches folder up into backport, pending and hack folders * properly format/comment all patches * merge debloat patches * merge Kconfig patches * merge swconfig patches * merge hotplug patches * drop 200-fix_localversion.patch - upstream * drop 222-arm_zimage_none.patch - unused * drop 252-mv_cesa_depends.patch - no longer required * drop 410-mtd-move-forward-declaration-of-struct-mtd_info.patch - unused * drop 661-fq_codel_keep_dropped_stats.patch - outdated * drop 702-phy_add_aneg_done_function.patch - upstream * drop 840-rtc7301.patch - unused * drop 841-rtc_pt7c4338.patch - upstream * drop 921-use_preinit_as_init.patch - unused * drop spio-gpio-old and gpio-mmc - unused Signed-off-by: John Crispin --- ...MIPS-fix-cache-flushing-for-highmem-pages.patch | 30 ++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 target/linux/generic/pending-4.9/100-MIPS-fix-cache-flushing-for-highmem-pages.patch (limited to 'target/linux/generic/pending-4.9/100-MIPS-fix-cache-flushing-for-highmem-pages.patch') diff --git a/target/linux/generic/pending-4.9/100-MIPS-fix-cache-flushing-for-highmem-pages.patch b/target/linux/generic/pending-4.9/100-MIPS-fix-cache-flushing-for-highmem-pages.patch new file mode 100644 index 0000000..622fab6 --- /dev/null +++ b/target/linux/generic/pending-4.9/100-MIPS-fix-cache-flushing-for-highmem-pages.patch @@ -0,0 +1,30 @@ +From: Felix Fietkau +Subject: MIPS: fix cache flushing for highmem pages + +Most cache flush ops were no-op for highmem pages. This led to nasty +segfaults and (in the case of page_address(page) == NULL) kernel +crashes. + +Fix this by always flushing highmem pages using kmap/kunmap_atomic +around the actual cache flush. This might be a bit inefficient, but at +least it's stable. + +Signed-off-by: Felix Fietkau +--- + +--- a/arch/mips/mm/cache.c ++++ b/arch/mips/mm/cache.c +@@ -115,6 +115,13 @@ void __flush_anon_page(struct page *page + { + unsigned long addr = (unsigned long) page_address(page); + ++ if (PageHighMem(page)) { ++ addr = (unsigned long)kmap_atomic(page); ++ flush_data_cache_page(addr); ++ __kunmap_atomic((void *)addr); ++ return; ++ } ++ + if (pages_do_alias(addr, vmaddr)) { + if (page_mapcount(page) && !Page_dcache_dirty(page)) { + void *kaddr; -- cgit v1.1