From: Ralf Baechle <ralf@linux-mips.org>
Date: Tue, 16 Aug 2005 17:47:00 +0000 (+0000)
Subject: Add a few simple error checks to tlb dumper.
X-Git-Tag: v3.12-rc1~41253^2~1^2~106
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ac351d947390c00b8ece3cde997fe173fc8649ed;p=kernel%2Fkernel-generic.git

Add a few simple error checks to tlb dumper.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

diff --git a/arch/mips/lib-32/dump_tlb.c b/arch/mips/lib-32/dump_tlb.c
index 9373a77..46519f4 100644
--- a/arch/mips/lib-32/dump_tlb.c
+++ b/arch/mips/lib-32/dump_tlb.c
@@ -160,24 +160,27 @@ void dump_list_process(struct task_struct *t, void *address)
 
 	if (addr > KSEG0)
 		page_dir = pgd_offset_k(0);
-	else
+	else if (t->mm) {
 		page_dir = pgd_offset(t->mm, 0);
-	printk("page_dir == %08x\n", (unsigned int) page_dir);
+		printk("page_dir == %08x\n", (unsigned int) page_dir);
+	} else
+		printk("Current thread has no mm\n");
 
 	if (addr > KSEG0)
 		pgd = pgd_offset_k(addr);
-	else
+	else if (t->mm) {
 		pgd = pgd_offset(t->mm, addr);
-	printk("pgd == %08x, ", (unsigned int) pgd);
+		printk("pgd == %08x, ", (unsigned int) pgd);
+		pud = pud_offset(pgd, addr);
+		printk("pud == %08x, ", (unsigned int) pud);
 
-	pud = pud_offset(pgd, addr);
-	printk("pud == %08x, ", (unsigned int) pud);
-
-	pmd = pmd_offset(pud, addr);
-	printk("pmd == %08x, ", (unsigned int) pmd);
+		pmd = pmd_offset(pud, addr);
+		printk("pmd == %08x, ", (unsigned int) pmd);
 
-	pte = pte_offset(pmd, addr);
-	printk("pte == %08x, ", (unsigned int) pte);
+		pte = pte_offset(pmd, addr);
+		printk("pte == %08x, ", (unsigned int) pte);
+	} else
+		printk("Current thread has no mm\n");
 
 	page = *pte;
 #ifdef CONFIG_64BIT_PHYS_ADDR