Re: 2.6.12-rc6-mm1

[Russell King <rmk+lkml@arm.linux.org.uk>]

On Sun, Jun 19, 2005 at 10:02:26AM +0100, Russell King wrote:
> On Sun, Jun 19, 2005 at 02:20:48AM +0100, Richard Purdie wrote:
> > On Sun, 2005-06-19 at 00:18 +0100, Russell King wrote: 
> > > Thinking about what's probably happening, I suspect all the ARM suspend
> > > and resume code needs to be reworked to save more state.  I'll try to
> > > cook up a patch tomorrow to fix it, but I'll need you to provide
> > > feedback.
> > 
> > Ok, thanks. I'm happy to test any fixes/patches.
> 
> This should resolve the problem - we now rely on the stack pointer for
> each CPU mode to remain constant throughout the running time of the
> kernel, which includes across suspend/resume cycles.

Actually, this patch is probably an all-round better solution.

--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -328,7 +328,7 @@ static void __init setup_processor(void)
  * cpu_init dumps the cache information, initialises SMP specific
  * information, and sets up the per-CPU stacks.
  */
-void __init cpu_init(void)
+void cpu_init(void)
 {
 	unsigned int cpu = smp_processor_id();
 	struct stack *stk = &stacks[cpu];
--- a/arch/arm/mach-pxa/pm.c
+++ b/arch/arm/mach-pxa/pm.c
@@ -133,6 +133,8 @@ static int pxa_pm_enter(suspend_state_t 
 	/* *** go zzz *** */
 	pxa_cpu_pm_enter(state);
 
+	cpu_init();
+
 	/* after sleeping, validate the checksum */
 	checksum = 0;
 	for (i = 0; i < SLEEP_SAVE_SIZE - 1; i++)
--- a/arch/arm/mach-sa1100/pm.c
+++ b/arch/arm/mach-sa1100/pm.c
@@ -88,6 +88,8 @@ static int sa11x0_pm_enter(suspend_state
 	/* go zzz */
 	sa1100_cpu_suspend();
 
+	cpu_init();
+
 	/*
 	 * Ensure not to come back here if it wasn't intended
 	 */
--- a/include/asm-arm/system.h
+++ b/include/asm-arm/system.h
@@ -104,6 +104,7 @@ extern void show_pte(struct mm_struct *m
 extern void __show_regs(struct pt_regs *);
 
 extern int cpu_architecture(void);
+extern void cpu_init(void);
 
 #define set_cr(x)					\
 	__asm__ __volatile__(				\


-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core