From 37b000b640741132eddaa9fbeca1f988139ad7e2 Mon Sep 17 00:00:00 2001 From: Xishi Qiu Date: Wed, 11 Sep 2013 14:21:41 -0700 Subject: mm/hotplug: remove unnecessary BUG_ON in __offline_pages() I think we can remove "BUG_ON(start_pfn >= end_pfn)" in __offline_pages(), because in memory_block_action() "nr_pages = PAGES_PER_SECTION * sections_per_block" is always greater than 0. memory_block_action() offline_pages() __offline_pages() BUG_ON(start_pfn >= end_pfn) In v2.6.32, If info->length==0, this way may hit this BUG_ON(). acpi_memory_disable_device() remove_memory(info->start_addr, info->length) offline_pages() A later Fujitsu patch renamed this function and the BUG_ON() is unnecessary. Signed-off-by: Xishi Qiu Reviewed-by: Dave Hansen Cc: Toshi Kani Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memory_hotplug.c | 1 - 1 file changed, 1 deletion(-) (limited to 'mm/memory_hotplug.c') diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index ca1dd3aa5eee..8e333f953f08 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1472,7 +1472,6 @@ static int __ref __offline_pages(unsigned long start_pfn, struct zone *zone; struct memory_notify arg; - BUG_ON(start_pfn >= end_pfn); /* at least, alignment against pageblock is necessary */ if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) return -EINVAL; -- cgit v1.2.3