linux-kernel - Re: 2.6.24-rc5-mm1 -- inconsistent {in-hardirq-W} -> {hardirq-on-W} usage -- pm-hibernate/9940 [HC0[0]:SC0[0]:HE1:SE1]

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Date:	Wed, 19 Dec 2007 15:22:08 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Daniel Walker <dwalker@...sta.com>,
	Miles Lane <miles.lane@...il.com>,
	Pavel Machek <pavel@...e.cz>,
	linux-pm@...ts.linux-foundation.org,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: 2.6.24-rc5-mm1 -- inconsistent {in-hardirq-W} -> {hardirq-on-W}
 usage -- pm-hibernate/9940 [HC0[0]:SC0[0]:HE1:SE1]

On Thu, 20 Dec 2007, Rafael J. Wysocki wrote:

> > We could reexport drain_local_pages() again but then I do not understand 
> > why we would only drain the pages of this processor and not of all other
> > processors as well. It seems that software suspend intend was to flush 
> > them all right?
> 
> Well, not exactly.  We are on one CPU at this point, the others have been
> disabled.

Ok so the others are flush. Here is a patch to re-export 
drain_local_pages() again and use it for software suspend:

Signed-off-by: Christoph Lameter <clameter@....com>

---
 include/linux/gfp.h     |    1 +
 kernel/power/snapshot.c |    2 +-
 mm/page_alloc.c         |    2 +-
 3 files changed, 3 insertions(+), 2 deletions(-)

Index: linux-2.6.24-rc5-mm1/kernel/power/snapshot.c
===================================================================
--- linux-2.6.24-rc5-mm1.orig/kernel/power/snapshot.c	2007-12-19 11:59:25.233961700 -0800
+++ linux-2.6.24-rc5-mm1/kernel/power/snapshot.c	2007-12-19 15:16:34.179661929 -0800
@@ -1203,7 +1203,7 @@ asmlinkage int swsusp_save(void)
 
 	printk(KERN_INFO "PM: Creating hibernation image: \n");
 
-	drain_all_pages();
+	drain_local_pages(NULL);
 	nr_pages = count_data_pages();
 	nr_highmem = count_highmem_pages();
 	printk(KERN_INFO "PM: Need to copy %u pages\n", nr_pages + nr_highmem);
Index: linux-2.6.24-rc5-mm1/mm/page_alloc.c
===================================================================
--- linux-2.6.24-rc5-mm1.orig/mm/page_alloc.c	2007-12-19 12:01:00.630421258 -0800
+++ linux-2.6.24-rc5-mm1/mm/page_alloc.c	2007-12-19 15:12:19.850545818 -0800
@@ -930,7 +930,7 @@ static void drain_pages(unsigned int cpu
 /*
  * Spill all of this CPU's per-cpu pages back into the buddy allocator.
  */
-static void drain_local_pages(void *arg)
+void drain_local_pages(void *arg)
 {
 	drain_pages(smp_processor_id());
 }
Index: linux-2.6.24-rc5-mm1/include/linux/gfp.h
===================================================================
--- linux-2.6.24-rc5-mm1.orig/include/linux/gfp.h	2007-12-19 15:13:51.926950065 -0800
+++ linux-2.6.24-rc5-mm1/include/linux/gfp.h	2007-12-19 15:16:11.951564369 -0800
@@ -229,5 +229,6 @@ extern void FASTCALL(free_cold_page(stru
 void page_alloc_init(void);
 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
 void drain_all_pages(void);
+void drain_local_pages(void *dummy);
 
 #endif /* __LINUX_GFP_H */
 
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