This is a note to let you know that I've just added the patch titled
MIPS: Handle highmem pages in __update_cache
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mips-handle-highmem-pages-in-__update_cache.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f4281bba818105c7c91799abe40bc05c0dbdaa25 Mon Sep 17 00:00:00 2001
From: Paul Burton <paul.burton@xxxxxxxxxx>
Date: Tue, 1 Mar 2016 02:37:58 +0000
Subject: MIPS: Handle highmem pages in __update_cache
From: Paul Burton <paul.burton@xxxxxxxxxx>
commit f4281bba818105c7c91799abe40bc05c0dbdaa25 upstream.
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 <paul.burton@xxxxxxxxxx>
Cc: Lars Persson <lars.persson@xxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Jerome Marchand <jmarchan@xxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/12721/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/mm/cache.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -143,9 +143,17 @@ void __update_cache(struct vm_area_struc
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);
}
}
Patches currently in stable-queue which might be from paul.burton@xxxxxxxxxx are
queue-4.4/mips-disable-preemption-during-prctl-pr_set_fp_mode.patch
queue-4.4/mips-fix-sigreturn-via-vdso-on-micromips-kernel.patch
queue-4.4/mips-handle-highmem-pages-in-__update_cache.patch
queue-4.4/mips-fix-watchpoint-restoration.patch
queue-4.4/mips-build-micromips-vdso-for-micromips-kernels.patch
queue-4.4/mips-math-emu-fix-jalr-emulation-when-rd-0.patch
queue-4.4/mips-sync-icache-dcache-in-set_pte_at.patch
queue-4.4/mips-fix-msa-ld_-st_-asm-macros-to-use-ptr_addu.patch
queue-4.4/mips-prevent-restoration-of-msa-context-in-non-msa-kernels.patch
queue-4.4/mips-use-copy_s.fmt-rather-than-copy_u.fmt.patch
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