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parisc: Avoid zeroing gr[0] in fixup_exception()

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Register gr[0] holds the PSW in interrupt context. It's absolutely
unlikely that the compiler will use register zero in a get_user() call,
but better BUG on such a case in fixup_exception() anyway.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2017-06-08 22:06:54 +02:00
parent 649aa24254
commit b752c7b207
1 changed files with 1 additions and 0 deletions
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arch/parisc/mm/fault.c
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@ -154,6 +154,7 @@ int fixup_exception(struct pt_regs *regs)
/* zero target register for get_user() */
if (parisc_acctyp(0, regs->iir) == VM_READ) {
int treg = regs->iir & 0x1f;
BUG_ON(treg == 0);
regs->gr[treg] = 0;
}
}