linux-kernel - [PATCH] mm/nobootmem: return 0 when start_pfn equals end

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Date:   Tue,  2 May 2017 21:11:15 +0800
From:   Wei Yang <richard.weiyang@...il.com>
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Wei Yang <richard.weiyang@...il.com>
Subject: [PATCH] mm/nobootmem: return 0 when start_pfn equals end_pfn

When start_pfn equals end_pfn, __free_pages_memory() takes no effect and
__free_memory_core() will finally return (end_pfn - start_pfn) = 0.

This patch returns 0 directly when start_pfn equals end_pfn.

Signed-off-by: Wei Yang <richard.weiyang@...il.com>
---
 mm/nobootmem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index 487dad610731..36454d0f96ee 100644
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -118,7 +118,7 @@ static unsigned long __init __free_memory_core(phys_addr_t start,
 	unsigned long end_pfn = min_t(unsigned long,
 				      PFN_DOWN(end), max_low_pfn);
 
-	if (start_pfn > end_pfn)
+	if (start_pfn >= end_pfn)
 		return 0;
 
 	__free_pages_memory(start_pfn, end_pfn);
-- 
2.11.0