diff options
| -rw-r--r-- | target/linux/generic/pending-4.14/100-MIPS-fix-cache-flushing-for-highmem-pages.patch | 30 | ||||
| -rw-r--r-- | target/linux/generic/pending-4.19/100-MIPS-fix-cache-flushing-for-highmem-pages.patch | 30 |
2 files changed, 0 insertions, 60 deletions
diff --git a/target/linux/generic/pending-4.14/100-MIPS-fix-cache-flushing-for-highmem-pages.patch b/target/linux/generic/pending-4.14/100-MIPS-fix-cache-flushing-for-highmem-pages.patch deleted file mode 100644 index b1c65f7cd8..0000000000 --- a/target/linux/generic/pending-4.14/100-MIPS-fix-cache-flushing-for-highmem-pages.patch +++ /dev/null @@ -1,30 +0,0 @@ -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 -@@ -116,6 +116,13 @@ 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; diff --git a/target/linux/generic/pending-4.19/100-MIPS-fix-cache-flushing-for-highmem-pages.patch b/target/linux/generic/pending-4.19/100-MIPS-fix-cache-flushing-for-highmem-pages.patch deleted file mode 100644 index b1c65f7cd8..0000000000 --- a/target/linux/generic/pending-4.19/100-MIPS-fix-cache-flushing-for-highmem-pages.patch +++ /dev/null @@ -1,30 +0,0 @@ -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 -@@ -116,6 +116,13 @@ 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; |