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mm/nobootmem.c: return 0 when start_pfn equals end_pfn

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When start_pfn equals end_pfn, __free_pages_memory() has 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.

Link: http://lkml.kernel.org/r/20170502131115.6650-1-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wei Yang 2017-07-06 15:36:53 -07:00 committed by Linus Torvalds
parent f2f43e566a
commit 172ffeb9b9
1 changed files with 1 additions and 1 deletions
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mm/nobootmem.c
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@ -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);