linux/mm
Davidlohr Bueso ad4404a226 mm,hugetlb: simplify error handling in hugetlb_cow()
When returning from hugetlb_cow(), we always (1) put back the refcount
for each referenced page -- always 'old', and 'new' if allocation was
successful.  And (2) retake the page table lock right before returning,
as the callers expects.  This logic can be simplified and encapsulated,
as proposed in this patch.  In addition to cleaner code, we also shave a
few bytes off the instruction text:

   text    data     bss     dec     hex filename
  28399     462   41328   70189   1122d mm/hugetlb.o-baseline
  28367     462   41328   70157   1120d mm/hugetlb.o-patched

Passes libhugetlbfs testcases.

Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Cc: Aswin Chandramouleeswaran <aswin@hp.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-08-06 18:01:19 -07:00
..
Kconfig CMA: generalize CMA reserved area management functionality 2014-08-06 18:01:16 -07:00
Kconfig.debug
Makefile CMA: generalize CMA reserved area management functionality 2014-08-06 18:01:16 -07:00
backing-dev.c
balloon_compaction.c
bootmem.c
cleancache.c
cma.c mm, CMA: clean-up log message 2014-08-06 18:01:16 -07:00
compaction.c mm, compaction: properly signal and act upon lock and need_sched() contention 2014-06-04 16:54:11 -07:00
debug-pagealloc.c
dmapool.c mm/dmapool.c: reuse devres_release() to free resources 2014-06-04 16:54:08 -07:00
early_ioremap.c
fadvise.c
failslab.c
filemap.c mm: replace init_page_accessed by __SetPageReferenced 2014-08-06 18:01:19 -07:00
filemap_xip.c
fremap.c mm: mark remap_file_pages() syscall as deprecated 2014-06-06 16:08:17 -07:00
frontswap.c swap: change swap_list_head to plist, add swap_avail_head 2014-06-04 16:54:07 -07:00
gup.c mm: cleanup __get_user_pages() 2014-06-04 16:54:05 -07:00
highmem.c
huge_memory.c mm: huge_memory: use GFP_TRANSHUGE when charging huge pages 2014-08-06 18:01:17 -07:00
hugetlb.c mm,hugetlb: simplify error handling in hugetlb_cow() 2014-08-06 18:01:19 -07:00
hugetlb_cgroup.c cgroup: replace cgroup_add_cftypes() with cgroup_add_legacy_cftypes() 2014-07-15 11:05:09 -04:00
hwpoison-inject.c mm/hwpoison-inject.c: remove unnecessary null test before debugfs_remove_recursive 2014-08-06 18:01:19 -07:00
init-mm.c
internal.h mm/internal.h: use nth_page 2014-08-06 18:01:16 -07:00
interval_tree.c
iov_iter.c bio_vec-backed iov_iter 2014-05-06 17:39:45 -04:00
kmemcheck.c
kmemleak-test.c mm/kmemleak-test.c: use pr_fmt for logging 2014-06-06 16:08:18 -07:00
kmemleak.c mm: introduce kmemleak_update_trace() 2014-06-06 16:08:17 -07:00
ksm.c sched: Remove proliferation of wait_on_bit() action functions 2014-07-16 15:10:39 +02:00
list_lru.c
maccess.c
madvise.c mm: update the description for madvise_remove 2014-08-06 18:01:18 -07:00
memblock.c mm/memblock.c: call kmemleak directly from memblock_(alloc|free) 2014-06-06 16:08:17 -07:00
memcontrol.c mm: memcontrol: do not acquire page_cgroup lock for kmem pages 2014-08-06 18:01:17 -07:00
memory-failure.c hwpoison: call action_result() in failure path of hwpoison_user_mappings() 2014-07-30 17:16:13 -07:00
memory.c mm/memory.c: use entry = ACCESS_ONCE(*pte) in handle_pte_fault() 2014-08-06 18:01:15 -07:00
memory_hotplug.c mem-hotplug: introduce MMOP_OFFLINE to replace the hard coding -1 2014-08-06 18:01:16 -07:00
mempolicy.c Merge branch 'for-3.16-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2014-07-10 11:38:23 -07:00
mempool.c mm/mempool.c: update the kmemleak stack trace for mempool allocations 2014-06-06 16:08:17 -07:00
migrate.c mm: fix direct reclaim writeback regression 2014-07-26 14:38:50 -07:00
mincore.c
mlock.c
mm_init.c
mmap.c mm: catch memory commitment underflow 2014-08-06 18:01:19 -07:00
mmu_context.c
mmu_notifier.c
mmzone.c
mprotect.c
mremap.c mm, thp: close race between mremap() and split_huge_page() 2014-05-11 17:55:48 +09:00
msync.c msync: fix incorrect fstart calculation 2014-07-03 09:21:53 -07:00
nobootmem.c mm/memblock.c: call kmemleak directly from memblock_(alloc|free) 2014-06-06 16:08:17 -07:00
nommu.c mm: nommu: per-thread vma cache fix 2014-06-23 16:47:43 -07:00
oom_kill.c
page-writeback.c mm/page-writeback.c: fix divide by zero in bdi_dirty_limits() 2014-07-30 17:16:13 -07:00
page_alloc.c mm: export NR_SHMEM via sysinfo(2) / si_meminfo() interfaces 2014-08-06 18:01:19 -07:00
page_cgroup.c
page_io.c fix __swap_writepage() compile failure on old gcc versions 2014-06-14 19:30:48 -05:00
page_isolation.c
pagewalk.c
percpu-km.c
percpu-vm.c
percpu.c percpu: Use ALIGN macro instead of hand coding alignment calculation 2014-06-19 11:00:27 -04:00
pgtable-generic.c
process_vm_access.c
quicklist.c
readahead.c mm/readahead.c: remove unused file_ra_state from count_history_pages 2014-08-06 18:01:15 -07:00
rmap.c mm/rmap.c: fix pgoff calculation to handle hugepage correctly 2014-07-23 15:10:54 -07:00
shmem.c mm: replace init_page_accessed by __SetPageReferenced 2014-08-06 18:01:19 -07:00
slab.c mm/slab.c: fix comments 2014-08-06 18:01:15 -07:00
slab.h slab: convert last use of __FUNCTION__ to __func__ 2014-08-06 18:01:15 -07:00
slab_common.c mm: move slab related stuff from util.c to slab_common.c 2014-08-06 18:01:15 -07:00
slob.c slab: get_online_mems for kmem_cache_{create,destroy,shrink} 2014-06-04 16:53:59 -07:00
slub.c slab: fix the alias count (via sysfs) of slab cache 2014-08-06 18:01:15 -07:00
sparse-vmemmap.c
sparse.c
swap.c mm: replace init_page_accessed by __SetPageReferenced 2014-08-06 18:01:19 -07:00
swap_state.c mm: page_alloc: convert hot/cold parameter and immediate callers to bool 2014-06-04 16:54:09 -07:00
swapfile.c mm/swapfile.c: delete the "last_in_cluster < scan_base" loop in the body of scan_swap_map() 2014-06-04 16:54:12 -07:00
truncate.c mm/fs: fix pessimization in hole-punching pagecache 2014-07-23 15:10:55 -07:00
util.c mm: move slab related stuff from util.c to slab_common.c 2014-08-06 18:01:15 -07:00
vmacache.c mm,vmacache: optimize overflow system-wide flushing 2014-06-04 16:53:57 -07:00
vmalloc.c mm, vmalloc: constify allocation mask 2014-08-06 18:01:18 -07:00
vmpressure.c
vmscan.c mm: vmscan: clean up struct scan_control 2014-08-06 18:01:18 -07:00
vmstat.c mm: use the light version __mod_zone_page_state in mlocked_vma_newpage() 2014-06-04 16:54:07 -07:00
workingset.c
zbud.c mm/zbud.c: make size unsigned like unique callsite 2014-06-04 16:54:13 -07:00
zsmalloc.c zsmalloc: fixup trivial zs size classes value in comments 2014-06-04 16:54:13 -07:00
zswap.c mm/zswap: NUMA aware allocation for zswap_dstmem 2014-06-04 16:54:14 -07:00