5 files changed, 28 insertions, 52 deletions

diff --git a/arch/x86/lib/cmdline.c b/arch/x86/lib/cmdline.c
index 3261abb21ef4..4f1719e22d3c 100644
--- a/arch/x86/lib/cmdline.c
+++ b/arch/x86/lib/cmdline.c
@@ -1,6 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
- * This file is part of the Linux kernel, and is made available under
- * the terms of the GNU General Public License version 2.
  *
  * Misc librarized functions for cmdline poking.
  */
diff --git a/arch/x86/lib/cmpxchg16b_emu.S b/arch/x86/lib/cmpxchg16b_emu.S
index 9b330242e740..d63185698a23 100644
--- a/arch/x86/lib/cmpxchg16b_emu.S
+++ b/arch/x86/lib/cmpxchg16b_emu.S
@@ -1,10 +1,4 @@
-/*
- *	This program is free software; you can redistribute it and/or
- *	modify it under the terms of the GNU General Public License
- *	as published by the Free Software Foundation; version 2
- *	of the License.
- *
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 #include <linux/linkage.h>
 #include <asm/percpu.h>
 
diff --git a/arch/x86/lib/cmpxchg8b_emu.S b/arch/x86/lib/cmpxchg8b_emu.S
index 03a186fc06ea..691d80e97488 100644
--- a/arch/x86/lib/cmpxchg8b_emu.S
+++ b/arch/x86/lib/cmpxchg8b_emu.S
@@ -1,10 +1,4 @@
-/*
- *	This program is free software; you can redistribute it and/or
- *	modify it under the terms of the GNU General Public License
- *	as published by the Free Software Foundation; version 2
- *	of the License.
- *
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <linux/linkage.h>
 #include <asm/export.h>
diff --git a/arch/x86/lib/insn-eval.c b/arch/x86/lib/insn-eval.c
index cf00ab6c6621..306c3a0902ba 100644
--- a/arch/x86/lib/insn-eval.c
+++ b/arch/x86/lib/insn-eval.c
@@ -557,7 +557,8 @@ static int get_reg_offset_16(struct insn *insn, struct pt_regs *regs,
 }
 
 /**
- * get_desc() - Obtain pointer to a segment descriptor
+ * get_desc() - Obtain contents of a segment descriptor
+ * @out:	Segment descriptor contents on success
  * @sel:	Segment selector
  *
  * Given a segment selector, obtain a pointer to the segment descriptor.
@@ -565,18 +566,18 @@ static int get_reg_offset_16(struct insn *insn, struct pt_regs *regs,
  *
  * Returns:
  *
- * Pointer to segment descriptor on success.
+ * True on success, false on failure.
  *
  * NULL on error.
  */
-static struct desc_struct *get_desc(unsigned short sel)
+static bool get_desc(struct desc_struct *out, unsigned short sel)
 {
 	struct desc_ptr gdt_desc = {0, 0};
 	unsigned long desc_base;
 
 #ifdef CONFIG_MODIFY_LDT_SYSCALL
 	if ((sel & SEGMENT_TI_MASK) == SEGMENT_LDT) {
-		struct desc_struct *desc = NULL;
+		bool success = false;
 		struct ldt_struct *ldt;
 
 		/* Bits [15:3] contain the index of the desired entry. */
@@ -584,12 +585,14 @@ static struct desc_struct *get_desc(unsigned short sel)
 
 		mutex_lock(&current->active_mm->context.lock);
 		ldt = current->active_mm->context.ldt;
-		if (ldt && sel < ldt->nr_entries)
-			desc = &ldt->entries[sel];
+		if (ldt && sel < ldt->nr_entries) {
+			*out = ldt->entries[sel];
+			success = true;
+		}
 
 		mutex_unlock(&current->active_mm->context.lock);
 
-		return desc;
+		return success;
 	}
 #endif
 	native_store_gdt(&gdt_desc);
@@ -604,9 +607,10 @@ static struct desc_struct *get_desc(unsigned short sel)
 	desc_base = sel & ~(SEGMENT_RPL_MASK | SEGMENT_TI_MASK);
 
 	if (desc_base > gdt_desc.size)
-		return NULL;
+		return false;
 
-	return (struct desc_struct *)(gdt_desc.address + desc_base);
+	*out = *(struct desc_struct *)(gdt_desc.address + desc_base);
+	return true;
 }
 
 /**
@@ -628,7 +632,7 @@ static struct desc_struct *get_desc(unsigned short sel)
  */
 unsigned long insn_get_seg_base(struct pt_regs *regs, int seg_reg_idx)
 {
-	struct desc_struct *desc;
+	struct desc_struct desc;
 	short sel;
 
 	sel = get_segment_selector(regs, seg_reg_idx);
@@ -666,11 +670,10 @@ unsigned long insn_get_seg_base(struct pt_regs *regs, int seg_reg_idx)
 	if (!sel)
 		return -1L;
 
-	desc = get_desc(sel);
-	if (!desc)
+	if (!get_desc(&desc, sel))
 		return -1L;
 
-	return get_desc_base(desc);
+	return get_desc_base(&desc);
 }
 
 /**
@@ -692,7 +695,7 @@ unsigned long insn_get_seg_base(struct pt_regs *regs, int seg_reg_idx)
  */
 static unsigned long get_seg_limit(struct pt_regs *regs, int seg_reg_idx)
 {
-	struct desc_struct *desc;
+	struct desc_struct desc;
 	unsigned long limit;
 	short sel;
 
@@ -706,8 +709,7 @@ static unsigned long get_seg_limit(struct pt_regs *regs, int seg_reg_idx)
 	if (!sel)
 		return 0;
 
-	desc = get_desc(sel);
-	if (!desc)
+	if (!get_desc(&desc, sel))
 		return 0;
 
 	/*
@@ -716,8 +718,8 @@ static unsigned long get_seg_limit(struct pt_regs *regs, int seg_reg_idx)
 	 * not tested when checking the segment limits. In practice,
 	 * this means that the segment ends in (limit << 12) + 0xfff.
 	 */
-	limit = get_desc_limit(desc);
-	if (desc->g)
+	limit = get_desc_limit(&desc);
+	if (desc.g)
 		limit = (limit << 12) + 0xfff;
 
 	return limit;
@@ -741,7 +743,7 @@ static unsigned long get_seg_limit(struct pt_regs *regs, int seg_reg_idx)
  */
 int insn_get_code_seg_params(struct pt_regs *regs)
 {
-	struct desc_struct *desc;
+	struct desc_struct desc;
 	short sel;
 
 	if (v8086_mode(regs))
@@ -752,8 +754,7 @@ int insn_get_code_seg_params(struct pt_regs *regs)
 	if (sel < 0)
 		return sel;
 
-	desc = get_desc(sel);
-	if (!desc)
+	if (!get_desc(&desc, sel))
 		return -EINVAL;
 
 	/*
@@ -761,10 +762,10 @@ int insn_get_code_seg_params(struct pt_regs *regs)
 	 * determines whether a segment contains data or code. If this is a data
 	 * segment, return error.
 	 */
-	if (!(desc->type & BIT(3)))
+	if (!(desc.type & BIT(3)))
 		return -EINVAL;
 
-	switch ((desc->l << 1) | desc->d) {
+	switch ((desc.l << 1) | desc.d) {
 	case 0: /*
 		 * Legacy mode. CS.L=0, CS.D=0. Address and operand size are
 		 * both 16-bit.
diff --git a/arch/x86/lib/iomap_copy_64.S b/arch/x86/lib/iomap_copy_64.S
index 33147fef3452..a9bdf0805be0 100644
--- a/arch/x86/lib/iomap_copy_64.S
+++ b/arch/x86/lib/iomap_copy_64.S
@@ -1,18 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Copyright 2006 PathScale, Inc.  All Rights Reserved.
- *
- * This file is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
 #include <linux/linkage.h>