kernel-ark/arch/powerpc/kernel/swsusp.c
Tang Yuantian 0330581ab3 powerpc/mm: Fix the call trace when resumed from hibernation
In SMP mode, the kernel would produce call trace when resumed
	from hibernation. The reason is when the function destroy_context
	is called to drop the resuming mm context, the mm->context.active
	is 1 which is wrong and should be zero.
	We pass the current->active_mm as previous mm context to function
	switch_mmu_context to decrease the context.active by 1.

	In UP mode, there is no effect.

Signed-off-by: Tang Yuantian <b29983@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-09-20 09:19:58 +10:00

39 lines
889 B
C

/*
* Common powerpc suspend code for 32 and 64 bits
*
* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/sched.h>
#include <asm/system.h>
#include <asm/current.h>
#include <asm/mmu_context.h>
void save_processor_state(void)
{
/*
* flush out all the special registers so we don't need
* to save them in the snapshot
*/
flush_fp_to_thread(current);
flush_altivec_to_thread(current);
flush_spe_to_thread(current);
#ifdef CONFIG_PPC64
hard_irq_disable();
#endif
}
void restore_processor_state(void)
{
#ifdef CONFIG_PPC32
switch_mmu_context(current->active_mm, current->active_mm);
#endif
}