]> git.baikalelectronics.ru Git - kernel.git/commit
parisc: Use implicit space register selection for loading the coherence index of...
authorJohn David Anglin <dave.anglin@bell.net>
Tue, 28 May 2019 00:15:14 +0000 (20:15 -0400)
committerHelge Deller <deller@gmx.de>
Thu, 6 Jun 2019 12:12:18 +0000 (14:12 +0200)
commitab101058c6d92764a6ec62af7f090616ba02af14
treef1dcdf2ecb8d36db9b9224d9ad08cc092eeb096d
parentdb90e3ac6b031a6b78d391fe2ae854681dc8f03e
parisc: Use implicit space register selection for loading the coherence index of I/O pdirs

We only support I/O to kernel space. Using %sr1 to load the coherence
index may be racy unless interrupts are disabled. This patch changes the
code used to load the coherence index to use implicit space register
selection. This saves one instruction and eliminates the race.

Tested on rp3440, c8000 and c3750.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Cc: stable@vger.kernel.org
Signed-off-by: Helge Deller <deller@gmx.de>
drivers/parisc/ccio-dma.c
drivers/parisc/sba_iommu.c