* [PATCH] mm/nobootmem: return 0 when start_pfn equals end_pfn
@ 2017-05-02 13:11 Wei Yang
0 siblings, 0 replies; only message in thread
From: Wei Yang @ 2017-05-02 13:11 UTC (permalink / raw)
To: akpm; +Cc: linux-mm, linux-kernel, Wei Yang
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@gmail.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
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