]> git.baikalelectronics.ru Git - kernel.git/commit
openrisc: fix boot oops when DEBUG_VM is enabled
authorStafford Horne <shorne@gmail.com>
Fri, 26 Jun 2020 03:29:17 +0000 (20:29 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 26 Jun 2020 07:27:36 +0000 (00:27 -0700)
commit313a5257b84c26b7f080c5d294aabe7d38ca439c
treec8fbf539166e30ae59f4257d74cf8bf88ac58a89
parent908f7d12d3ba51dfe0449b9723199b423f97ca9a
openrisc: fix boot oops when DEBUG_VM is enabled

Since v5.8-rc1 OpenRISC Linux fails to boot when DEBUG_VM is enabled.
This has been bisected to commit 42fc541404f2 ("mmap locking API: add
mmap_assert_locked() and mmap_assert_write_locked()").

The added locking checks exposed the issue that OpenRISC was not taking
this mmap lock when during page walks for DMA operations.  This patch
locks and unlocks the mmap lock for page walking.

Link: http://lkml.kernel.org/r/20200617090247.1680188-1-shorne@gmail.com
Fixes: 42fc541404f2 ("mmap locking API: add mmap_assert_locked() and mmap_assert_write_locked()"
Signed-off-by: Stafford Horne <shorne@gmail.com>
Reviewed-by: Michel Lespinasse <walken@google.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Steven Price <steven.price@arm.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/openrisc/kernel/dma.c