Commit b752c7b2 authored Jun 08, 2017 by Helge Deller

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



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>

parent 649aa242

arch/parisc/mm/fault.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}
		}