linux-kernel - [PATCH] x86: More users of PF_ constants in fault

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Date:	Tue, 08 Jan 2008 16:48:54 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] x86: More users of PF_ constants in fault_32|64.c

Should be the last of the error_code tests that could use
the PF_ defines.  Makes X86_32|64 a little closer.

Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
---
 arch/x86/mm/fault_32.c |    7 ++++---
 arch/x86/mm/fault_64.c |    2 +-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/x86/mm/fault_32.c b/arch/x86/mm/fault_32.c
index 50a9930..adf5fed 100644
--- a/arch/x86/mm/fault_32.c
+++ b/arch/x86/mm/fault_32.c
@@ -404,7 +404,8 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code)
 	 * protection error (error_code & 9) == 0.
 	 */
 	if (unlikely(address >= TASK_SIZE)) {
-		if (!(error_code & 0x0000000d) && vmalloc_fault(address) >= 0)
+		if (!(error_code & (PF_RSVD|PF_USER|PF_PROT)) &&
+		    vmalloc_fault(address) >= 0)
 			return;
 		if (notify_page_fault(regs))
 			return;
@@ -607,7 +608,7 @@ no_context:
 		__typeof__(pte_val(__pte(0))) page;
 
 #ifdef CONFIG_X86_PAE
-		if (error_code & 16) {
+		if (error_code & PF_INSTR) {
 			pte_t *pte = lookup_address(address);
 
 			if (pte && pte_present(*pte) && !pte_exec_kernel(*pte))
@@ -678,7 +679,7 @@ out_of_memory:
 		goto survive;
 	}
 	printk("VM: killing process %s\n", tsk->comm);
-	if (error_code & 4)
+	if (error_code & PF_USER)
 		do_group_exit(SIGKILL);
 	goto no_context;
 
diff --git a/arch/x86/mm/fault_64.c b/arch/x86/mm/fault_64.c
index 018ab78..267a1d5 100644
--- a/arch/x86/mm/fault_64.c
+++ b/arch/x86/mm/fault_64.c
@@ -681,7 +681,7 @@ out_of_memory:
 		goto again;
 	}
 	printk("VM: killing process %s\n", tsk->comm);
-	if (error_code & 4)
+	if (error_code & PF_USER)
 		do_group_exit(SIGKILL);
 	goto no_context;
 
-- 
1.5.4.rc2.1164.g6451

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