[PATCH 3/4] MIPS: Handle highmem pages in __update_cache
From: Paul Burton <hidden>
Date: 2016-03-01 02:39:11
Also in:
lkml, stable
Subsystem:
mips, the rest · Maintainers:
Thomas Bogendoerfer, Linus Torvalds
The following patch will expose __update_cache to highmem pages. Handle them by mapping them in for the duration of the cache maintenance, just like in __flush_dcache_page. The code for that isn't shared because we need the page address in __update_cache so sharing became messy. Given that the entirity is an extra 5 lines, just duplicate it. Signed-off-by: Paul Burton <redacted> Cc: Lars Persson <lars.persson@axis.com> Cc: stable <redacted> # v4.1+ --- arch/mips/mm/cache.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
index 5a67d8c..8befa55 100644
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c@@ -149,9 +149,17 @@ void __update_cache(struct vm_area_struct *vma, unsigned long address, return; page = pfn_to_page(pfn); if (page_mapping(page) && Page_dcache_dirty(page)) { - addr = (unsigned long) page_address(page); + if (PageHighMem(page)) + addr = (unsigned long)kmap_atomic(page); + else + addr = (unsigned long)page_address(page); + if (exec || pages_do_alias(addr, address & PAGE_MASK)) flush_data_cache_page(addr); + + if (PageHighMem(page)) + __kunmap_atomic((void *)addr); + ClearPageDcacheDirty(page); } }
--
2.7.1