Commit b15d53d0 authored Feb 29, 2016 by David Hildenbrand Committed by Rich Felker Mar 17, 2016

sched/preempt, sh: kmap_coherent relies on disabled preemption



kmap_coherent needs disabled preemption to not schedule in the critical
section, just like kmap_coherent on mips and kmap_atomic in general.

Fixes: 8222dbe2 "sched/preempt, mm/fault: Decouple preemption from the page fault logic"
Reported-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Tested-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Rich Felker <dalias@libc.org>

parent 044b81f8

arch/sh/mm/kmap.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -36,6 +36,7 @@ void kmap_coherent(struct page page, unsigned long addr)

		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();
		}