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ARM: 9276/1: Refactor dump_instr()

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1. Rename local variable 'val16' to 'tmp'. So that the processing
   statements of thumb and arm can be aligned.
2. Fix two sparse check warnings: (add __user for type conversion)
   warning: incorrect type in initializer (different address spaces)
      expected unsigned short [noderef] __user *register __p
      got unsigned short [usertype] *
3. 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>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Zhen Lei 2022-11-28 12:42:42 +01:00 committed by Russell King (Oracle)
parent 59e2cf8d21
commit 21d0798acf
1 changed files with 13 additions and 12 deletions
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25
arch/arm/kernel/traps.c
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@ -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 *)addr)[i]);
if (thumb) {
u16 tmp;
if (user_mode(regs))
bad = get_user(tmp, &((u16 __user *)addr)[i]);
else
bad = get_user(val, &((u32 *)addr)[i]);
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)