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authorStefan Roese <sr@denx.de>2011-04-15 01:49:53 +0200
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-04-18 05:08:21 +0200
commit09597cfe93d3cc2c6e064a3ead5956b882511560 (patch)
tree9b5912a2576e413aa8bbe1c0da20a19ed54c6e82 /arch/powerpc
parentpowerpc: Fix oops if scan_dispatch_log is called too early (diff)
downloadlinux-09597cfe93d3cc2c6e064a3ead5956b882511560.tar.xz
linux-09597cfe93d3cc2c6e064a3ead5956b882511560.zip
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>
Diffstat (limited to 'arch/powerpc')
-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 811f04ac3660..8d1569c29042 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