Commit da9bc726 authored May 24, 2007 by Ralf Baechle

[MIPS] SMTC: Don't set and restore irqregs ptr from self_ipi.

This did corrupt register s0 which the caller of self_ipi expects to
be unchanged. This is a kernel bug which will only be triggered with
the compilers which compile __smtc_ipi_replay to use s0 across the
invocation of self_ipi. Gcc 4.1.2 does this, for example.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

parent fbf6ede2

arch/mips/kernel/smtc-asm.S

+0 −3

Original line number	Diff line number	Diff line
		@@ -121,10 +121,7 @@ LEAF(self_ipi)
		subu t1,sp,PT_SIZE
		sw ra,PT_EPC(t1)
		sw a0,PT_PADSLOT4(t1)
		LONG_L s0, TI_REGS($28)
		LONG_S sp, TI_REGS($28)
		la t2,ipi_decode
		LONG_S s0, TI_REGS($28)
		sw t2,PT_PADSLOT5(t1)
		/* Save pre-disable value of TCStatus */
		sw t0,PT_TCSTATUS(t1)