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| author | Xishi Qiu <qiuxishi@huawei.com> | 2013-09-11 14:21:41 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-11 15:57:35 -0700 |
| commit | 37b000b640741132eddaa9fbeca1f988139ad7e2 (patch) | |
| tree | 8456554ec797adf9c03c56173c48c2082bcdb40e /mm/memory_hotplug.c | |
| parent | b136be5e0b6e8e3e4dcb6722b51bb35199b06810 (diff) | |
| download | lwn-37b000b640741132eddaa9fbeca1f988139ad7e2.tar.gz lwn-37b000b640741132eddaa9fbeca1f988139ad7e2.zip | |
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 <qiuxishi@huawei.com>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory_hotplug.c')
| -rw-r--r-- | mm/memory_hotplug.c | 1 |
1 files changed, 0 insertions, 1 deletions
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; |