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[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>
This commit is contained in:
Ralf Baechle 2007-05-24 14:56:58 +01:00
parent fbf6ede2ce
commit da9bc7263d
1 changed files with 0 additions and 3 deletions
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3
arch/mips/kernel/smtc-asm.S
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@ -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)