[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>
This commit is contained in:
parent
4706df3d3c
commit
63028aa7f5
|
@ -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.
|
||||
|
|
Loading…
Reference in a new issue