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authorStefan Roese <sr@denx.de>2011-04-14 23:49:53 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-04-18 13:08:21 +1000
commit09597cfe93d3cc2c6e064a3ead5956b882511560 (patch)
tree9b5912a2576e413aa8bbe1c0da20a19ed54c6e82
parent84ffae55af79d7b8834fd0c08d0d1ebf2c77f91e (diff)
downloadlinux-linaro-09597cfe93d3cc2c6e064a3ead5956b882511560.tar.gz
powerpc: Don't write protect kernel text with CONFIG_DYNAMIC_FTRACE enabled
This problem was noticed on an MPC855T platform. Ftrace did oops when trying to write to the kernel text segment. Many thanks to Joakim for finding the root cause of this problem. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Joakim Tjernlund <joakim.tjernlund@transmode.se> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/include/asm/pte-common.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/pte-common.h b/arch/powerpc/include/asm/pte-common.h
index 811f04ac366..8d1569c2904 100644
--- a/arch/powerpc/include/asm/pte-common.h
+++ b/arch/powerpc/include/asm/pte-common.h
@@ -162,7 +162,7 @@ extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
* on platforms where such control is possible.
*/
#if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\
- defined(CONFIG_KPROBES)
+ defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE)
#define PAGE_KERNEL_TEXT PAGE_KERNEL_X
#else
#define PAGE_KERNEL_TEXT PAGE_KERNEL_ROX