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| author | John Crispin <john@phrozen.org> | 2016-12-25 20:11:34 +0100 |
|---|---|---|
| committer | John Crispin <john@phrozen.org> | 2017-08-05 08:46:36 +0200 |
| commit | 74d00a8c3849c1340efd713eb94b786e304c201f (patch) | |
| tree | de481743de61c34da96ab5f9dba3af3edcfb8260 /target/linux/generic/pending-4.9/100-MIPS-fix-cache-flushing-for-highmem-pages.patch | |
| parent | de350550ef648d9728351b986b0516fa29465c45 (diff) | |
| download | upstream-74d00a8c3849c1340efd713eb94b786e304c201f.tar.gz upstream-74d00a8c3849c1340efd713eb94b786e304c201f.tar.bz2 upstream-74d00a8c3849c1340efd713eb94b786e304c201f.zip | |
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* drop 661-fq_codel_keep_dropped_stats.patch - outdated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 <john@phrozen.org>
Diffstat (limited to 'target/linux/generic/pending-4.9/100-MIPS-fix-cache-flushing-for-highmem-pages.patch')
| -rw-r--r-- | target/linux/generic/pending-4.9/100-MIPS-fix-cache-flushing-for-highmem-pages.patch | 30 |
1 files changed, 30 insertions, 0 deletions
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 0000000000..622fab65b7 --- /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 <nbd@nbd.name> +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 <nbd@nbd.name> +--- + +--- 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; |