This is a note to let you know that I've just added the patch titled
sched/preempt, sh: kmap_coherent relies on disabled preemption
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:
sched-preempt-sh-kmap_coherent-relies-on-disabled-preemption.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 b15d53d009558d14c4f394a6d1fa2039c7f45c43 Mon Sep 17 00:00:00 2001
From: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx>
Date: Mon, 29 Feb 2016 09:19:24 +0100
Subject: sched/preempt, sh: kmap_coherent relies on disabled preemption
From: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx>
commit b15d53d009558d14c4f394a6d1fa2039c7f45c43 upstream.
kmap_coherent needs disabled preemption to not schedule in the critical
section, just like kmap_coherent on mips and kmap_atomic in general.
Fixes: 8222dbe21e79 "sched/preempt, mm/fault: Decouple preemption from the page fault logic"
Reported-by: Hans Verkuil <hverkuil@xxxxxxxxx>
Signed-off-by: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx>
Tested-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Rich Felker <dalias@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/sh/mm/kmap.c | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/sh/mm/kmap.c
+++ b/arch/sh/mm/kmap.c
@@ -36,6 +36,7 @@ void *kmap_coherent(struct page *page, u
BUG_ON(!test_bit(PG_dcache_clean, &page->flags));
+ preempt_disable();
pagefault_disable();
idx = FIX_CMAP_END -
@@ -64,4 +65,5 @@ void kunmap_coherent(void *kvaddr)
}
pagefault_enable();
+ preempt_enable();
}
Patches currently in stable-queue which might be from dahi@xxxxxxxxxxxxxxxxxx are
queue-4.4/sched-preempt-sh-kmap_coherent-relies-on-disabled-preemption.patch
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