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authorRalf Baechle <ralf@linux-mips.org>2007-05-24 14:56:58 +0100
committerRalf Baechle <ralf@linux-mips.org>2007-06-11 18:20:53 +0100
commitda9bc7263dc7e32d52dd922fe3f46eb7107c0143 (patch)
treeedf2cb84da2d95f9444a7affd1432f802dee44a4
parentfbf6ede2ce05592661cec04e04b88f6bab00eb09 (diff)
[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>
-rw-r--r--arch/mips/kernel/smtc-asm.S3
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/mips/kernel/smtc-asm.S b/arch/mips/kernel/smtc-asm.S
index 921207c4a83..20938a4cb52 100644
--- a/arch/mips/kernel/smtc-asm.S
+++ b/arch/mips/kernel/smtc-asm.S
@@ -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)