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Groups > linux.kernel > #1521640
| From | Stafford Horne <shorne@gmail.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v2 9/9] openrisc: include l.swa in check for write data pagefault |
| Date | 2016-11-14 14:40 +0100 |
| Message-ID | <sDpEl-7Av-1@gated-at.bofh.it> (permalink) |
| References | <sDpEl-7Av-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> 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 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/openrisc/kernel/entry.S b/arch/openrisc/kernel/entry.S index 572d223..aac0bde 100644 --- a/arch/openrisc/kernel/entry.S +++ b/arch/openrisc/kernel/entry.S @@ -264,7 +264,7 @@ EXCEPTION_ENTRY(_data_page_fault_handler) l.srli r6,r6,26 // check opcode for write access #endif - l.sfgeui r6,0x34 // check opcode for write access + l.sfgeui r6,0x33 // check opcode for write access l.bnf 1f l.sfleui r6,0x37 l.bnf 1f -- 2.7.4
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[PATCH v2 9/9] openrisc: include l.swa in check for write data pagefault Stafford Horne <shorne@gmail.com> - 2016-11-14 14:40 +0100
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