[power] Optimize pmdisk assembly.

- No need to save %ebx, since we replace it with saved version after we 
  restore image.

- No need to use long long for the loop counters, since they can't conceivably
  exeed 32 bits. We can then fit them in general registers, and don't actually
  have to write them back after each iteration. 

- Use rep ; movsl to copy each page, instead of copying a byte at a time. 
  This actually makes a noticable improvment when restoring the saved image.
  This also relieves register pressure by using %esi and %edi, which allows
  us to kill the loop variables altogether.

- Call {save,restore}_processor_state() from the pmdisk C functions. We need
  to make sure all the counters are set appropriately before and after each
  path, and we don't _have_ to call them from assembly. 

1 files changed, 4 insertions, 0 deletions

diff --git a/kernel/power/pmdisk.c b/kernel/power/pmdisk.c
index 58a5a6afaaa4..51029739af3d 100644
--- a/kernel/power/pmdisk.c
+++ b/kernel/power/pmdisk.c
@@ -1126,7 +1126,9 @@ int pmdisk_save(void)
 	if ((error = arch_prepare_suspend()))
 		return error;
 	local_irq_disable();
+	save_processor_state();
 	error = pmdisk_arch_suspend(0);
+	restore_processor_state();
 	local_irq_enable();
 	return error;
 }
@@ -1186,7 +1188,9 @@ int __init pmdisk_restore(void)
 {
 	int error;
 	local_irq_disable();
+	save_processor_state();
 	error = pmdisk_arch_suspend(1);
+	restore_processor_state();
 	local_irq_enable();
 	return error;
 }