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Commit 63028aa7 authored by Kiyoshi Ueda's avatar Kiyoshi Ueda Committed by Tony Luck
Browse files

[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: default avatarKiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: default avatarJun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent 4706df3d

arch/ia64/mm/fault.c

+3 −3
Original line number Diff line number Diff line
@@ -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.