[MIPS] SMTC: Fix crash if # of TC's > # of VPE's after pt_regs irq cleanup. (cb56837e) · Commits · 戴 / test

arch/mips/kernel/entry.S

+3 −0

Original line number	Diff line number	Diff line
		@@ -83,7 +83,10 @@ FEXPORT(syscall_exit)
		FEXPORT(restore_all) # restore full frame
		#ifdef CONFIG_MIPS_MT_SMTC
		/* Detect and execute deferred IPI "interrupts" */
		LONG_L s0, TI_REGS($28)
		LONG_S sp, TI_REGS($28)
		jal deferred_smtc_ipi
		LONG_S s0, TI_REGS($28)
		/* Re-arm any temporarily masked interrupts not explicitly "acked" */
		mfc0 v0, CP0_TCSTATUS
		ori v1, v0, TCSTATUS_IXMT

+6 −1

Original line number	Diff line number	Diff line
		@@ -101,7 +101,9 @@ FEXPORT(__smtc_ipi_vector)
		lw t0,PT_PADSLOT5(sp)
		/* Argument from sender passed in stack pad slot 4 */
		lw a0,PT_PADSLOT4(sp)
		PTR_LA ra, _ret_from_irq
		LONG_L s0, TI_REGS($28)
		LONG_S sp, TI_REGS($28)
		PTR_LA ra, ret_from_irq
		jr t0

		/*
		@@ -119,7 +121,10 @@ 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)