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authorPaul Mackerras <paulus@samba.org>2009-04-06 17:21:10 +0000
committerPaul Mackerras <paulus@samba.org>2009-04-07 15:19:01 +1000
commit11b55da700eb77905f1c2dde3a0cbeedc665a753 (patch)
treea99df58800151b3503a24424550fad55c160b6e1 /arch/powerpc
parent1a917bb549deb0b6bcb0321db22e9c27525a1e3d (diff)
downloadlwn-11b55da700eb77905f1c2dde3a0cbeedc665a753.tar.gz
lwn-11b55da700eb77905f1c2dde3a0cbeedc665a753.zip
powerpc: Fix oops when loading modules
This fixes a problem reported by Sean MacLennan where loading any module would cause an oops. We weren't marking the pages containing the module text as having hardware execute permission, due to a bug introduced in commit 8d1cf34e ("powerpc/mm: Tweak PTE bit combination definitions"), hence trying to execute the module text caused an exception on processors that support hardware execute permission. This adds _PAGE_HWEXEC to the definitions of PAGE_KERNEL_X and PAGE_KERNEL_ROX to fix this problem. Reported-by: Sean MacLennan <smaclennan@pikatech.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/include/asm/pte-common.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/pte-common.h b/arch/powerpc/include/asm/pte-common.h
index d9740e886801..a7e210b6b48c 100644
--- a/arch/powerpc/include/asm/pte-common.h
+++ b/arch/powerpc/include/asm/pte-common.h
@@ -151,9 +151,11 @@ extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
_PAGE_NO_CACHE)
#define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
_PAGE_NO_CACHE | _PAGE_GUARDED)
-#define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW | _PAGE_EXEC)
+#define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW | _PAGE_EXEC | \
+ _PAGE_HWEXEC)
#define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
-#define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO | _PAGE_EXEC)
+#define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO | _PAGE_EXEC | \
+ _PAGE_HWEXEC)
/* Protection used for kernel text. We want the debuggers to be able to
* set breakpoints anywhere, so don't write protect the kernel text