From: Wei Yang <richard.weiyang@xxxxxxxxx> Subject: mm/nobootmem.c: return 0 when start_pfn equals end_pfn 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@xxxxxxxxx Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/nobootmem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN mm/nobootmem.c~mm-nobootmem-return-0-when-start_pfn-equals-end_pfn mm/nobootmem.c --- a/mm/nobootmem.c~mm-nobootmem-return-0-when-start_pfn-equals-end_pfn +++ a/mm/nobootmem.c @@ -118,7 +118,7 @@ static unsigned long __init __free_memor 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); _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
