Re: [RFC PATCHv2] x86: Pull out oops printing helper fromdo_page_fault

[Harvey Harrison]

Pull out an show_fault_oops() helper out from the oops printing
code in do_page_fault.

Try to make 32/64 bit oops traces have more similar format.

Signed-off-by: Harvey Harrison <harvey.harrison@xxxxxxxxx>
---
Clearly that last patch was for discussion only, he's one that
actually compiles (missing comma on args in show_fault_oops)

 arch/x86/mm/fault_32.c |   53 ++++++++++++++++++++++++++---------------------
 arch/x86/mm/fault_64.c |   24 +++++++++++++++------
 2 files changed, 46 insertions(+), 31 deletions(-)

diff --git a/arch/x86/mm/fault_32.c b/arch/x86/mm/fault_32.c
index 0bd2417..83b4c1a 100644
--- a/arch/x86/mm/fault_32.c
+++ b/arch/x86/mm/fault_32.c
@@ -396,6 +396,34 @@ static inline int vmalloc_fault(unsigned long address)
 #endif
 }
 
+static void show_fault_oops(struct pt_regs *regs, unsigned long error_code,
+			    unsigned long address)
+{
+	if (!oops_may_print())
+		return;
+
+#ifdef CONFIG_X86_PAE
+	if (error_code & PF_INSTR) {
+		int level;
+		pte_t *pte = lookup_address(address, &level);
+
+		if (pte && pte_present(*pte) && !pte_exec(*pte))
+			printk(KERN_CRIT "kernel tried to execute "
+				"NX-protected page - exploit attempt? "
+				"(uid: %d)\n", current->uid);
+	}
+#endif
+	printk(KERN_ALERT "BUG: unable to handle kernel ");
+	if (address < PAGE_SIZE)
+		printk(KERN_CONT "NULL pointer dereference");
+	else
+		printk(KERN_CONT "paging request");
+
+	printk(KERN_CONT " at: %08lx IP: %08lx\n", address, regs->ip);
+
+	dump_pagetable(address);
+}
+
 int show_unhandled_signals = 1;
 
 /*
@@ -633,30 +661,7 @@ no_context:
 
 	bust_spinlocks(1);
 
-	if (oops_may_print()) {
-
-#ifdef CONFIG_X86_PAE
-		if (error_code & PF_INSTR) {
-			int level;
-			pte_t *pte = lookup_address(address, &level);
-
-			if (pte && pte_present(*pte) && !pte_exec(*pte))
-				printk(KERN_CRIT "kernel tried to execute "
-					"NX-protected page - exploit attempt? "
-					"(uid: %d)\n", current->uid);
-		}
-#endif
-		if (address < PAGE_SIZE)
-			printk(KERN_ALERT "BUG: unable to handle kernel NULL "
-					"pointer dereference");
-		else
-			printk(KERN_ALERT "BUG: unable to handle kernel paging"
-					" request");
-		printk(" at virtual address %08lx\n", address);
-		printk(KERN_ALERT "printing ip: %08lx ", regs->ip);
-
-		dump_pagetable(address);
-	}
+	show_fault_oops(regs, error_code, address);
 
 	tsk->thread.cr2 = address;
 	tsk->thread.trap_no = 14;
diff --git a/arch/x86/mm/fault_64.c b/arch/x86/mm/fault_64.c
index ccbb8e3..34f50f6 100644
--- a/arch/x86/mm/fault_64.c
+++ b/arch/x86/mm/fault_64.c
@@ -384,6 +384,21 @@ static int vmalloc_fault(unsigned long address)
 #endif
 }
 
+static void show_fault_oops(struct pt_regs *regs, unsigned long error_code,
+			    unsigned long address)
+{
+	printk(KERN_ALERT "BUG: unable to handle kernel ");
+	if (address < PAGE_SIZE)
+		printk(KERN_CONT "NULL pointer dereference");
+	else
+		printk(KERN_CONT "paging request");
+
+	printk(KERN_CONT " at %016lx IP: \n", address);
+	printk_address(regs->ip, 1);
+
+	dump_pagetable(address);
+}
+
 int show_unhandled_signals = 1;
 
 /*
@@ -636,13 +651,8 @@ no_context:
 
 	flags = oops_begin();
 
-	if (address < PAGE_SIZE)
-		printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
-	else
-		printk(KERN_ALERT "Unable to handle kernel paging request");
-	printk(" at %016lx RIP: \n" KERN_ALERT, address);
-	printk_address(regs->ip, 1);
-	dump_pagetable(address);
+	show_fault_oops(regs, error_code, address);
+
 	tsk->thread.cr2 = address;
 	tsk->thread.trap_no = 14;
 	tsk->thread.error_code = error_code;
-- 
1.5.4.rc3.1118.gf6754c



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