Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: Eliminate various 'set but not used' warnings
  x86, SMEP: Fix section mismatch warnings
  x86, amd: Use _safe() msr access for GartTlbWlk disable code

arch/x86/kernel/amd_iommu.c

@@ -1538,13 +1538,11 @@ static void do_detach(struct device *dev)
 {
 	struct iommu_dev_data *dev_data;
 	struct amd_iommu *iommu;
-	struct pci_dev *pdev;
 	u16 devid;
 
 	devid    = get_device_id(dev);
 	iommu    = amd_iommu_rlookup_table[devid];
 	dev_data = get_dev_data(dev);
-	pdev     = to_pci_dev(dev);
 
 	/* decrease reference counters */
 	dev_data->domain->dev_iommu[iommu->index] -= 1;
@@ -1703,10 +1701,9 @@ static struct protection_domain *domain_for_device(struct device *dev)
 	struct protection_domain *dom;
 	struct iommu_dev_data *dev_data, *alias_data;
 	unsigned long flags;
-	u16 devid, alias;
+	u16 devid;
 
 	devid      = get_device_id(dev);
-	alias      = amd_iommu_alias_table[devid];
 	dev_data   = get_dev_data(dev);
 	alias_data = get_dev_data(dev_data->alias);
 	if (!alias_data)

arch/x86/kernel/cpu/amd.c

@@ -629,10 +629,13 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
 		 * Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=33012
 		 */
 		u64 mask;
+		int err;
 
-		rdmsrl(MSR_AMD64_MCx_MASK(4), mask);
-		mask |= (1 << 10);
-		wrmsrl(MSR_AMD64_MCx_MASK(4), mask);
+		err = rdmsrl_safe(MSR_AMD64_MCx_MASK(4), &mask);
+		if (err == 0) {
+			mask |= (1 << 10);
+			checking_wrmsrl(MSR_AMD64_MCx_MASK(4), mask);
+		}
 	}
 }
 

arch/x86/kernel/test_nx.c

@@ -161,7 +161,7 @@ static int test_NX(void)
 	}
 
 #endif
-	return 0;
+	return ret;
 }
 
 static void test_exit(void)

arch/x86/mm/pf_in.c

@@ -414,22 +414,17 @@ unsigned long get_ins_reg_val(unsigned long ins_addr, struct pt_regs *regs)
 	unsigned char *p;
 	struct prefix_bits prf;
 	int i;
-	unsigned long rv;
 
 	p = (unsigned char *)ins_addr;
 	p += skip_prefix(p, &prf);
 	p += get_opcode(p, &opcode);
 	for (i = 0; i < ARRAY_SIZE(reg_rop); i++)
-		if (reg_rop[i] == opcode) {
-			rv = REG_READ;
+		if (reg_rop[i] == opcode)
 			goto do_work;
-		}
 
 	for (i = 0; i < ARRAY_SIZE(reg_wop); i++)
-		if (reg_wop[i] == opcode) {
-			rv = REG_WRITE;
+		if (reg_wop[i] == opcode)
 			goto do_work;
-		}
 
 	printk(KERN_ERR "mmiotrace: Not a register instruction, opcode "
 							"0x%02x\n", opcode);
@@ -474,16 +469,13 @@ unsigned long get_ins_imm_val(unsigned long ins_addr)
 	unsigned char *p;
 	struct prefix_bits prf;
 	int i;
-	unsigned long rv;
 
 	p = (unsigned char *)ins_addr;
 	p += skip_prefix(p, &prf);
 	p += get_opcode(p, &opcode);
 	for (i = 0; i < ARRAY_SIZE(imm_wop); i++)
-		if (imm_wop[i] == opcode) {
-			rv = IMM_WRITE;
+		if (imm_wop[i] == opcode)
 			goto do_work;
-		}
 
 	printk(KERN_ERR "mmiotrace: Not an immediate instruction, opcode "
 							"0x%02x\n", opcode);