From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sat, 29 Dec 2018 18:13:23 +0000 (-0800)
Subject: Merge branch 'for-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu
X-Git-Tag: 4.21-smb3-small-fixes~44
X-Git-Url: http://git.samba.org/samba.git/?p=sfrench%2Fcifs-2.6.git;a=commitdiff_plain;h=55db91fbaad9ea769d516e6867195808b4399894;hp=9ef10340749e1da0c7fde609cedd5360f8484a0b

Merge branch 'for-4.21' of git://git./linux/kernel/git/dennis/percpu

Pull percpu update from Dennis Zhou:
 "Michael Cree noted generic UP Alpha has been broken since v3.18. This
  is a small fix for locking in UP percpu code that fixes the issue"

* 'for-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu:
  percpu: convert spin_lock_irq to spin_lock_irqsave.
---

diff --git a/mm/percpu-km.c b/mm/percpu-km.c
index 38de70ab1a0d..0f643dc2dc65 100644
--- a/mm/percpu-km.c
+++ b/mm/percpu-km.c
@@ -50,6 +50,7 @@ static struct pcpu_chunk *pcpu_create_chunk(gfp_t gfp)
 	const int nr_pages = pcpu_group_sizes[0] >> PAGE_SHIFT;
 	struct pcpu_chunk *chunk;
 	struct page *pages;
+	unsigned long flags;
 	int i;
 
 	chunk = pcpu_alloc_chunk(gfp);
@@ -68,9 +69,9 @@ static struct pcpu_chunk *pcpu_create_chunk(gfp_t gfp)
 	chunk->data = pages;
 	chunk->base_addr = page_address(pages) - pcpu_group_offsets[0];
 
-	spin_lock_irq(&pcpu_lock);
+	spin_lock_irqsave(&pcpu_lock, flags);
 	pcpu_chunk_populated(chunk, 0, nr_pages, false);
-	spin_unlock_irq(&pcpu_lock);
+	spin_unlock_irqrestore(&pcpu_lock, flags);
 
 	pcpu_stats_chunk_alloc();
 	trace_percpu_create_chunk(chunk->base_addr);