Commit 087d990b authored by Ralf Baechle's avatar Ralf Baechle
Browse files

MIPS: Idle: Break r4k_wait into two functions and fix it. 



local_irq_enable() may expand into very different code, so it rather should
stay in C.  Also this keeps the assembler code size constant which keeps
the rollback code simple.  So it's best to split r4k_wait into two parts,
one C and one assembler.

Finally add the local_irq_enable() to r4k_wait to ensure the WAIT
instruction in __r4k_wait() will work properly.

Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent f94d9a8e

arch/mips/include/asm/idle.h

+2 −1
Original line number Diff line number Diff line
@@ -4,7 +4,8 @@ 
#include <linux/linkage.h>



extern void (*cpu_wait)(void);

extern asmlinkage void r4k_wait(void);

extern void r4k_wait(void);

extern asmlinkage void __r4k_wait(void);

extern void r4k_wait_irqoff(void);

extern void __pastwait(void);

arch/mips/kernel/genex.S

+3 −3
Original line number Diff line number Diff line
@@ -122,7 +122,7 @@ handle_vcei: 
	__FINIT



	.align	5	/* 32 byte rollback region */

LEAF(r4k_wait)

LEAF(__r4k_wait)

	.set	push

	.set	noreorder

	/* start of rollback region */
@@ -146,14 +146,14 @@ LEAF(r4k_wait) 
	jr	ra

	nop

	.set	pop

	END(r4k_wait)

	END(__r4k_wait)



	.macro	BUILD_ROLLBACK_PROLOGUE handler

	FEXPORT(rollback_\handler)

	.set	push

	.set	noat

	MFC0	k0, CP0_EPC

	PTR_LA	k1, r4k_wait

	PTR_LA	k1, __r4k_wait

	ori	k0, 0x1f	/* 32 byte rollback region */

	xori	k0, 0x1f

	bne	k0, k1, 9f

arch/mips/kernel/idle.c

+6 −0
Original line number Diff line number Diff line
@@ -45,6 +45,12 @@ static void r39xx_wait(void) 
	local_irq_enable();

}



void r4k_wait(void)

{

	local_irq_enable();

	__r4k_wait();

}



/*

 * This variant is preferable as it allows testing need_resched and going to

 * sleep depending on the outcome atomically.  Unfortunately the "It is

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