From: Stefan Roese <sr@denx.de>
To: linuxppc-dev@ozlabs.org
Cc: Steven Rostedt <rostedt@goodmis.org>
Subject: [PATCH] powerpc: Don't write protect kernel text with CONFIG_DYNAMIC_FTRACE enabled
Date: Fri, 15 Apr 2011 11:49:53 +0200 [thread overview]
Message-ID: <1302860993-28829-1-git-send-email-sr@denx.de> (raw)
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>
---
arch/powerpc/include/asm/pte-common.h | 2 +-
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 811f04a..8d1569c 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
--
1.7.4.4
next reply other threads:[~2011-04-15 10:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-15 9:49 Stefan Roese [this message]
2011-04-15 14:51 ` [PATCH] powerpc: Don't write protect kernel text with CONFIG_DYNAMIC_FTRACE enabled Steven Rostedt
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