openrisc: include l.swa in check for write data pagefault
authorStefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Thu, 3 Jul 2014 17:46:40 +0000 (20:46 +0300)
committerStafford Horne <shorne@gmail.com>
Mon, 12 Dec 2016 14:10:26 +0000 (23:10 +0900)
commitcdb75442fedff8cc3ddedbe6e41d00b471634e17
tree5806594b87c978f1aacb7a69ce0e37c4c77aedc5
parentd01e1f35fee54fd7131e161956e609dfd47c1056
openrisc: include l.swa in check for write data pagefault

During page fault handling we check the last instruction to understand
if the fault was for a read or for a write.  By default we fall back to
read.  New instructions were added to the openrisc 1.1 spec for an
atomic load/store pair (l.lwa/l.swa).

This patch adds the opcode for l.swa (0x33) allowing it to be treated as
a write operation.

Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
[shorne@gmail.com: expanded a bit on the comment]
Signed-off-by: Stafford Horne <shorne@gmail.com>
arch/openrisc/kernel/entry.S