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Tejun Heo b3dc627cab memblock: memblock should be able to handle zero length operations 
Commit 24aa07882b ("memblock, x86: Replace memblock_x86_reserve/
free_range() with generic ones") replaced x86 specific memblock
operations with the generic ones; unfortunately, it lost zero length
operation handling in the process making the kernel panic if somebody
tries to reserve zero length area.

There isn't much to be gained by being cranky to zero length operations
and panicking is almost the worst response.  Drop the BUG_ON() in
memblock_reserve() and update memblock_add_region/isolate_range() so
that all zero length operations are handled as noops.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org
Reported-by: Valere Monseur <valere.monseur@ymail.com>
Bisected-by: Joseph Freeman <jfree143dev@gmail.com>
Tested-by: Joseph Freeman <jfree143dev@gmail.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=43098
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-04-20 11:18:46 -07:00
..
backing-dev.c
backing-dev: fix wakeup timer races with bdi_unregister()
2012-02-01 16:52:49 +08:00
bootmem.c
bootmem/sparsemem: remove limit constraint in alloc_bootmem_section
2012-03-21 17:54:58 -07:00
bounce.c
mm: remove the second argument of k[un]map_atomic()
2012-03-20 21:48:27 +08:00
cleancache.c
mm: cleancache: Use __read_mostly as appropiate.
2012-01-23 16:08:09 -05:00
compaction.c
mm: compaction: make compact_control order signed
2012-03-21 17:54:56 -07:00
debug-pagealloc.c
mm, x86: Remove debug_pagealloc_enabled
2011-12-06 09:24:07 +01:00
dmapool.c
mm: fix implicit stat.h usage in dmapool.c
2011-10-31 09:20:12 -04:00
fadvise.c
fadvise: only initiate writeback for specified range with FADV_DONTNEED
2012-01-10 16:30:43 -08:00
failslab.c
switch debugfs to umode_t
2012-01-03 22:54:56 -05:00
filemap_xip.c
mm/filemap_xip.c: fix race condition in xip_file_fault()
2012-02-03 16:16:41 -08:00
filemap.c
radix-tree: use iterators in find_get_pages* functions
2012-03-28 17:14:37 -07:00
fremap.c
mm: delete various needless include <linux/module.h>
2011-10-31 09:20:11 -04:00
highmem.c
Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
2011-11-06 19:44:47 -08:00
huge_memory.c
thp: optimize away unnecessary page table locking
2012-03-21 17:54:57 -07:00
hugetlb.c
hugetlb: fix race condition in hugetlb_fault()
2012-04-12 13:12:12 -07:00
hwpoison-inject.c
HWPOISON: Clean up memory_failure() vs. __memory_failure()
2012-01-03 12:06:32 -08:00
init-mm.c
atomic: use <linux/atomic.h>
2011-07-26 16:49:47 -07:00
internal.h
mm: thp: tail page refcounting fix
2011-11-02 16:06:57 -07:00
Kconfig
Merge branch 'master' into x86/memblock
2011-11-28 09:46:22 -08:00
Kconfig.debug
mm: more intensive memory corruption debugging
2012-01-10 16:30:42 -08:00
kmemcheck.c
kmemcheck: Fix build errors due to missing slab.h
2010-03-30 22:02:32 +09:00
kmemleak-test.c
kmemleak: remove memset by using kzalloc
2011-01-27 18:31:51 +00:00
kmemleak.c
kmemleak: Disable early logging when kmemleak is off by default
2012-01-20 16:57:05 +00:00
ksm.c
ksm: cleanup: introduce find_mergeable_vma()
2012-03-21 17:54:59 -07:00
maccess.c
mm: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
madvise.c
coredump: add VM_NODUMP, MADV_NODUMP, MADV_CLEAR_NODUMP
2012-03-23 16:58:42 -07:00
Makefile
Cross Memory Attach
2011-10-31 17:30:44 -07:00
memblock.c
memblock: memblock should be able to handle zero length operations
2012-04-20 11:18:46 -07:00
memcontrol.c
memcg: fix Bad page state after replace_page_cache
2012-04-18 23:40:57 -07:00
memory_hotplug.c
mm: compaction: introduce sync-light migration for use by compaction
2012-01-12 20:13:09 -08:00
memory-failure.c
Merge branch 'x86-mce-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2012-03-22 09:42:04 -07:00
memory.c
coredump: remove VM_ALWAYSDUMP flag
2012-03-23 16:58:42 -07:00
mempolicy.c
cpuset: mm: reduce large amounts of memory barrier related damage v3
2012-03-21 17:54:59 -07:00
mempool.c
mempool: fix first round failure behavior
2012-01-10 16:30:45 -08:00
migrate.c
mm: fix move/migrate_pages() race on task struct
2012-03-21 17:54:58 -07:00
mincore.c
mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode
2012-03-21 17:54:54 -07:00
mlock.c
vm: avoid using find_vma_prev() unnecessarily
2012-03-06 18:23:36 -08:00
mm_init.c
mm: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
mmap.c
Merge branch 'akpm' (Andrew's patch-bomb)
2012-03-22 09:04:48 -07:00
mmu_context.c
mm, counters: remove task argument to sync_mm_rss() and __sync_task_rss_stat()
2012-03-21 17:54:59 -07:00
mmu_notifier.c
mm: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
mmzone.c
mm: delete various needless include <linux/module.h>
2011-10-31 09:20:11 -04:00
mprotect.c
Merge branch 'akpm' (Andrew's patch-bomb)
2012-03-22 09:04:48 -07:00
mremap.c
mm: collapse security_vm_enough_memory() variants into a single function
2012-02-14 10:45:39 +11:00
msync.c
sanitize vfs_fsync calling conventions
2010-05-21 18:31:21 -04:00
nobootmem.c
Merge branch 'master' into x86/memblock
2011-11-28 09:46:22 -08:00
nommu.c
NOMMU: Don't need to clear vm_mm when deleting a VMA
2012-02-24 08:59:04 -08:00
oom_kill.c
signal: oom_kill_task: use SEND_SIG_FORCED instead of force_sig()
2012-03-23 16:58:41 -07:00
page_alloc.c
mm: only IPI CPUs to drain local pages if they exist
2012-03-28 17:14:35 -07:00
page_cgroup.c
page_cgroup: fix horrid swap accounting regression
2012-03-06 08:18:23 -08:00
page_io.c
block: kill off REQ_UNPLUG
2011-03-10 08:52:27 +01:00
page_isolation.c
mm: page_isolation: codeclean fix comment and rm unneeded val init
2010-10-26 16:52:11 -07:00
page-writeback.c
Ext4 commits for 3.3 merge window; mostly cleanups and bug fixes
2012-03-28 10:02:55 -07:00
pagewalk.c
mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode
2012-03-21 17:54:54 -07:00
percpu-km.c
percpu: clear memory allocated with the km allocator
2010-10-02 10:28:42 +03:00
percpu-vm.c
percpu: use bitmap_clear
2012-01-20 09:23:16 -08:00
percpu.c
Kmemleak patches
2012-01-14 18:11:11 -08:00
pgtable-generic.c
thp: add HPAGE_PMD_* definitions for !CONFIG_TRANSPARENT_HUGEPAGE
2012-03-21 17:55:02 -07:00
prio_tree.c
sanitize <linux/prefetch.h> usage
2011-05-20 12:50:29 -07:00
process_vm_access.c
Fix race in process_vm_rw_core
2012-02-02 12:55:17 -08:00
quicklist.c
mm: delete various needless include <linux/module.h>
2011-10-31 09:20:11 -04:00
readahead.c
mm: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
rmap.c
memcg: use new logic for page stat accounting
2012-03-21 17:55:01 -07:00
shmem.c
Merge branch 'akpm' (Andrew's patch-bomb)
2012-03-22 09:04:48 -07:00
slab.c
Merge branch 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux
2012-03-28 15:04:26 -07:00
slob.c
mm: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
slub.c
Merge branch 'akpm' (Andrew's patch-bomb)
2012-03-28 17:19:28 -07:00
sparse-vmemmap.c
mm: delete various needless include <linux/module.h>
2011-10-31 09:20:11 -04:00
sparse.c
bootmem/sparsemem: remove limit constraint in alloc_bootmem_section
2012-03-21 17:54:58 -07:00
swap_state.c
mm: make swapin readahead skip over holes
2012-03-21 17:54:56 -07:00
swap.c
mm: drain percpu lru add/rotate page-vectors on cpu hot-unplug
2012-03-21 17:54:58 -07:00
swapfile.c
swapon: check validity of swap_flags
2012-03-28 17:14:35 -07:00
thrash.c
mm/thrash.c: quiet sparse noise
2011-10-31 17:30:50 -07:00
truncate.c
mm for fs: add truncate_pagecache_range()
2012-03-28 17:14:35 -07:00
util.c
procfs: mark thread stack correctly in proc/<pid>/maps
2012-03-21 17:54:58 -07:00
vmalloc.c
mm: remove the second argument of k[un]map_atomic()
2012-03-20 21:48:27 +08:00
vmscan.c
Revert "mm: vmscan: fix misused nr_reclaimed in shrink_mem_cgroup_zone()"
2012-04-12 13:12:12 -07:00
vmstat.c
mm,x86,um: move CMPXCHG_LOCAL config option
2012-01-12 20:13:03 -08:00