diff options
Diffstat (limited to 'target/linux/generic/patches-4.9/100-MIPS-fix-cache-flushing-for-highmem-pages.patch')
| -rw-r--r-- | target/linux/generic/patches-4.9/100-MIPS-fix-cache-flushing-for-highmem-pages.patch | 31 |
1 files changed, 0 insertions, 31 deletions
diff --git a/target/linux/generic/patches-4.9/100-MIPS-fix-cache-flushing-for-highmem-pages.patch b/target/linux/generic/patches-4.9/100-MIPS-fix-cache-flushing-for-highmem-pages.patch deleted file mode 100644 index cbe666a61f..0000000000 --- a/target/linux/generic/patches-4.9/100-MIPS-fix-cache-flushing-for-highmem-pages.patch +++ /dev/null @@ -1,31 +0,0 @@ -From: Felix Fietkau <nbd@nbd.name> -Date: Sun, 24 Jan 2016 01:03:51 +0100 -Subject: [PATCH] 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; |