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authorKiyoshi Ueda <k-ueda@ct.jp.nec.com>2005-08-24 18:03:43 -0400
committerTony Luck <tony.luck@intel.com>2005-09-06 16:06:58 -0700
commit63028aa7f581d9d4e6889f9dc06ded2534250a76 (patch)
tree6167c2325aae1341161c41a1c9ce83e91fca2990
parent4706df3d3c42af802597d82c8b1542c3d52eab23 (diff)
downloadop-kernel-dev-63028aa7f581d9d4e6889f9dc06ded2534250a76.zip
op-kernel-dev-63028aa7f581d9d4e6889f9dc06ded2534250a76.tar.gz
[IA64] page_not_present fault in region 5 is normal
When copying data from user-space to kernel-space by __copy_user(), a page_not_present fault sometimes occurs at vmalloced kernel address because of VHPT pre-fetching. Ignore the page_not_present fault in ia64_do_page_fault() before jumping into exception handlers. Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com> Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
-rw-r--r--arch/ia64/mm/fault.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c
index ff62551..839d4f1 100644
--- a/arch/ia64/mm/fault.c
+++ b/arch/ia64/mm/fault.c
@@ -229,9 +229,6 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
return;
}
- if (ia64_done_with_exception(regs))
- return;
-
/*
* Since we have no vma's for region 5, we might get here even if the address is
* valid, due to the VHPT walker inserting a non present translation that becomes
@@ -242,6 +239,9 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
if (REGION_NUMBER(address) == 5 && mapped_kernel_page_is_present(address))
return;
+ if (ia64_done_with_exception(regs))
+ return;
+
/*
* Oops. The kernel tried to access some bad page. We'll have to terminate things
* with extreme prejudice.
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