tree 6167c2325aae1341161c41a1c9ce83e91fca2990
parent 4706df3d3c42af802597d82c8b1542c3d52eab23
author Kiyoshi Ueda <[EMAIL PROTECTED]> Thu, 25 Aug 2005 02:03:43 -0400
committer Tony Luck <[EMAIL PROTECTED]> Wed, 07 Sep 2005 06:06:58 -0700
[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 <[EMAIL PROTECTED]>
Signed-off-by: Jun'ichi Nomura <[EMAIL PROTECTED]>
Signed-off-by: Tony Luck <[EMAIL PROTECTED]>
arch/ia64/mm/fault.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c
--- a/arch/ia64/mm/fault.c
+++ b/arch/ia64/mm/fault.c
@@ -229,9 +229,6 @@ ia64_do_page_fault (unsigned long addres
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 addres
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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