linux-kernel - linux-next: manual merge of the akpm tree with the tip tree

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Date:	Thu, 27 Sep 2012 17:04:13 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Subject: linux-next: manual merge of the akpm tree with the tip tree

Hi Andrew,

Today's linux-next merge of the akpm tree got a conflict in
mm/huge_memory.c between commit 93c9d633bd9e ("mm/thp: Preserve pgprot
across huge page split") from the tip tree and commit "thp: merge page
pre-alloc in khugepaged_loop into khugepaged_do_scan" from the akpm tree.

I fixed it up (see below) and can carry the fix as necessary (no action
is required).

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au

diff --cc mm/huge_memory.c
index 5ab8c26,50bd2ac..0000000
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@@ -2307,11 -2240,43 +2307,41 @@@ static int khugepaged_wait_event(void
  		kthread_should_stop();
  }
  
- static void khugepaged_do_scan(struct page **hpage)
+ static void khugepaged_alloc_sleep(void)
+ {
+ 	wait_event_freezable_timeout(khugepaged_wait, false,
+ 			msecs_to_jiffies(khugepaged_alloc_sleep_millisecs));
+ }
+ 
+ #ifndef CONFIG_NUMA
+ static struct page *khugepaged_alloc_hugepage(bool *wait)
+ {
+ 	struct page *hpage;
+ 
+ 	do {
+ 		hpage = alloc_hugepage(khugepaged_defrag());
+ 		if (!hpage) {
+ 			count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
+ 			if (!*wait)
+ 				return NULL;
+ 
+ 			*wait = false;
+ 			khugepaged_alloc_sleep();
+ 		} else
+ 			count_vm_event(THP_COLLAPSE_ALLOC);
+ 	} while (unlikely(!hpage) && likely(khugepaged_enabled()));
+ 
+ 	return hpage;
+ }
+ #endif
+ 
+ static void khugepaged_do_scan(void)
  {
+ 	struct page *hpage = NULL;
  	unsigned int progress = 0, pass_through_head = 0;
 -	unsigned int pages = khugepaged_pages_to_scan;
 +	unsigned int pages = ACCESS_ONCE(khugepaged_pages_to_scan);
+ 	bool wait = true;
  
 -	barrier(); /* write khugepaged_pages_to_scan to local stack */
 -
  	while (progress < pages) {
  		cond_resched();
  

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