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[v3,2/3] ARM: Refactor dump_instr()

Message ID 20221014015956.2006-3-thunder.leizhen@huawei.com (mailing list archive)
State New, archived
Headers show
Series ARM: Make the dumped instructions are consistent with the disassembled ones | expand

Commit Message

Zhen Lei Oct. 14, 2022, 1:59 a.m. UTC 
1. Rename local variable 'val16' to 'tmp'. So that the processing
   statements of thumb and arm can be aligned.
2. Prepare for the next patch to avoid repeated judgment.
   Before:
   if (!user_mode(regs)) {
           if (thumb)
           else
   } else {
           if (thumb)
           else
   }

   After:
   if (thumb) {
           if (user_mode(regs))
           else
   } else {
           if (user_mode(regs))
           else
   }

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
---
 arch/arm/kernel/traps.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)
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Patch

diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index d455c97237e2079..182469a5b28a394 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -178,19 +178,20 @@  static void dump_instr(const char *lvl, struct pt_regs *regs)
 	for (i = -4; i < 1 + !!thumb; i++) {
 		unsigned int val, bad;
 
-		if (!user_mode(regs)) {
-			if (thumb) {
-				u16 val16;
-				bad = get_kernel_nofault(val16, &((u16 *)addr)[i]);
-				val = val16;
-			} else {
-				bad = get_kernel_nofault(val, &((u32 *)addr)[i]);
-			}
-		} else {
-			if (thumb)
-				bad = get_user(val, &((u16 __user *)addr)[i]);
+		if (thumb) {
+			u16 tmp;
+
+			if (user_mode(regs))
+				bad = get_user(tmp, &((u16 __user *)addr)[i]);
 			else
+				bad = get_kernel_nofault(tmp, &((u16 *)addr)[i]);
+
+			val = tmp;
+		} else {
+			if (user_mode(regs))
 				bad = get_user(val, &((u32 __user *)addr)[i]);
+			else
+				bad = get_kernel_nofault(val, &((u32 *)addr)[i]);
 		}
 
 		if (!bad)