Daniel Borkmann 0ea7eeec24 mm, percpu: add support for __GFP_NOWARN flag ... Add an option for pcpu_alloc() to support __GFP_NOWARN flag. Currently, we always throw a warning when size or alignment is unsupported (and also dump stack on failed allocation requests). The warning itself is harmless since we return NULL anyway for any failed request, which callers are required to handle anyway. However, it becomes harmful when panic_on_warn is set. The rationale for the WARN() in pcpu_alloc() is that it can be tracked when larger than supported allocation requests are made such that allocations limits can be tweaked if warranted. This makes sense for in-kernel users, however, there are users of pcpu allocator where allocation size is derived from user space requests, e.g. when creating BPF maps. In these cases, the requests should fail gracefully without throwing a splat. The current work-around was to check allocation size against the upper limit of PCPU_MIN_UNIT_SIZE from call-sites for bailing out prior to a call to pcpu_alloc() in order to avoid throwing the WARN(). This is bad in multiple ways since PCPU_MIN_UNIT_SIZE is an implementation detail, and having the checks on call-sites only complicates the code for no good reason. Thus, lets fix it generically by supporting the __GFP_NOWARN flag that users can then use with calling the __alloc_percpu_gfp() helper instead. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Cc: Tejun Heo <tj@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>		2017-10-19 13:13:49 +01:00
..
kasan	Merge branch 'linus' into locking/core, to pick up fixes	2017-08-10 12:20:53 +02:00
backing-dev.c	mm/backing-dev.c: fix an error handling path in 'cgwb_create()'	2017-09-11 14:16:44 -06:00
balloon_compaction.c	mm/migrate: new migrate mode MIGRATE_SYNC_NO_COPY	2017-09-08 18:26:46 -07:00
bootmem.c	mm/bootmem.c: cosmetic improvement of code readability	2017-02-22 16:41:29 -08:00
cleancache.c	fs: switch ->s_uuid to uuid_t	2017-06-05 16:59:12 +02:00
cma_debug.c	mm/cma_debug.c: fix stack corruption due to sprintf usage	2017-08-18 15:32:02 -07:00
cma.c	cma: fix calculation of aligned offset	2017-07-10 16:32:32 -07:00
cma.h	cma: Store a name in the cma structure	2017-04-18 20:41:12 +02:00
compaction.c	mm,compaction: serialize waitqueue_active() checks (for real)	2017-10-03 17:54:24 -07:00
debug_page_ref.c	mm/page_ref: add tracepoint to track down page reference manipulation	2016-03-17 15:09:34 -07:00
debug.c	mm: make tlb_flush_pending global	2017-08-10 15:54:07 -07:00
dmapool.c	lib/vsprintf.c: remove %Z support	2017-02-27 18:43:47 -08:00
early_ioremap.c	x86/mm: Add support to access boot related data in the clear	2017-07-18 11:38:02 +02:00
fadvise.c	mm: fadvise: avoid fadvise for fs without backing device	2017-09-08 18:26:47 -07:00
failslab.c	mm: fault-inject take over bootstrap kmem_cache check	2016-03-15 16:55:16 -07:00
filemap.c	mm: have filemap_check_and_advance_wb_err clear AS_EIO/AS_ENOSPC	2017-10-03 17:54:24 -07:00
frame_vector.c	treewide: use kv[mz]alloc* rather than opencoded variants	2017-05-08 17:15:13 -07:00
frontswap.c	mm, frontswap: convert frontswap_enabled to static key	2016-07-26 16:19:19 -07:00
gup.c	mm/device-public-memory: device memory cache coherent with CPU	2017-09-08 18:26:46 -07:00
highmem.c	mm/highmem: make nr_free_highpages() handles all highmem zones by itself	2016-05-19 19:12:14 -07:00
hmm.c	mm/hmm: avoid bloating arch that do not make use of HMM	2017-09-08 18:26:46 -07:00
huge_memory.c	mm: soft-dirty: keep soft-dirty bits over thp migration	2017-09-08 18:26:45 -07:00
hugetlb_cgroup.c	mm, hugetlb_cgroup: round limit_in_bytes down to hugepage size	2016-05-20 17:58:30 -07:00
hugetlb.c	powerpc updates for 4.14	2017-09-07 10:15:40 -07:00
hwpoison-inject.c	mm: hwpoison: call shake_page() unconditionally	2017-05-03 15:52:12 -07:00
init-mm.c	mm: Add a user_ns owner to mm_struct and fix ptrace permission checks	2016-11-22 11:49:48 -06:00
internal.h	mm, oom: do not rely on TIF_MEMDIE for memory reserves access	2017-09-06 17:27:30 -07:00
interval_tree.c	lib/interval_tree: fast overlap detection	2017-09-08 18:26:49 -07:00
Kconfig	mm/hmm: avoid bloating arch that do not make use of HMM	2017-09-08 18:26:46 -07:00
Kconfig.debug	mm: enable page poisoning early at boot	2017-05-03 15:52:10 -07:00
khugepaged.c	mm: make PR_SET_THP_DISABLE immediately active	2017-07-10 16:32:31 -07:00
kmemcheck.c	mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU	2017-04-18 11:42:36 -07:00
kmemleak-test.c	mm: convert printk(KERN_<LEVEL> to pr_<level>	2016-03-17 15:09:34 -07:00
kmemleak.c	mm: kmemleak: treat vm_struct as alternative reference to vmalloc'ed objects	2017-07-06 16:24:34 -07:00
ksm.c	ksm: fix unlocked iteration over vmas in cmp_and_merge_page()	2017-10-03 17:54:23 -07:00
list_lru.c	mm: memcontrol: use vmalloc fallback for large kmem memcg arrays	2017-10-03 17:54:25 -07:00
maccess.c	x86: remove more uaccess_32.h complexity	2016-05-22 17:21:27 -07:00
madvise.c	mm, hugetlb, soft_offline: save compound page order before page migration	2017-10-03 17:54:24 -07:00
Makefile	mm/hmm: avoid bloating arch that do not make use of HMM	2017-09-08 18:26:46 -07:00
memblock.c	mm/memblock.c: reversed logic in memblock_discard()	2017-08-25 16:12:46 -07:00
memcontrol.c	net: memcontrol: defer call to mem_cgroup_sk_alloc()	2017-10-09 20:55:01 -07:00
memory_hotplug.c	mm/memory_hotplug: define find_{smallest|biggest}_section_pfn as unsigned long	2017-10-03 17:54:26 -07:00
memory-failure.c	x86/mm, mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings of poison pages	2017-08-17 10:30:49 +02:00
memory.c	mm/device-public-memory: fix edge case in _vm_normal_page()	2017-10-03 17:54:25 -07:00
mempolicy.c	mm/mempolicy.c: remove BUG_ON() checks for VMA inside mpol_misplaced()	2017-09-08 18:26:47 -07:00
mempool.c	sched/wait: Rename wait_queue_t => wait_queue_entry_t	2017-06-20 12:18:27 +02:00
memtest.c	memtest: remove unused header files	2015-09-08 15:35:28 -07:00
migrate.c	mm/hmm: avoid bloating arch that do not make use of HMM	2017-09-08 18:26:46 -07:00
mincore.c	mm: remove shmem_mapping() shmem_zero_setup() duplicates	2017-02-24 17:46:56 -08:00
mlock.c	mm/mlock.c: use page_zone() instead of page_zone_id()	2017-09-08 18:26:47 -07:00
mm_init.c	mm: convert printk(KERN_<LEVEL> to pr_<level>	2016-03-17 15:09:34 -07:00
mmap.c	lib/interval_tree: fast overlap detection	2017-09-08 18:26:49 -07:00
mmu_context.c	sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h>	2017-03-02 08:42:38 +01:00
mmu_notifier.c	mm/mmu_notifier: kill invalidate_page	2017-08-31 16:13:00 -07:00
mmzone.c	mm/mmzone.c: swap likely to unlikely as code logic is different for next_zones_zonelist()	2017-02-22 16:41:29 -08:00
mprotect.c	mm/ZONE_DEVICE: new type of ZONE_DEVICE for unaddressable memory	2017-09-08 18:26:46 -07:00
mremap.c	mm: thp: check pmd migration entry in common path	2017-09-08 18:26:45 -07:00
msync.c	mm/msync: use offset_in_page macro	2015-11-05 19:34:48 -08:00
nobootmem.c	mm: discard memblock data later	2017-08-18 15:32:01 -07:00
nommu.c	Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-09-14 18:13:32 -07:00
oom_kill.c	mm, oom_reaper: skip mm structs with mmu notifiers	2017-10-03 17:54:24 -07:00
page_alloc.c	mm, page_alloc: add scheduling point to memmap_init_zone	2017-10-03 17:54:25 -07:00
page_counter.c	mm: page_counter: let page_counter_try_charge() return bool	2015-11-05 19:34:48 -08:00
page_ext.c	mm, page_ext: periodically reschedule during page_ext_init()	2017-09-06 17:27:26 -07:00
page_idle.c	mm/page_idle.c: constify attribute_group structures	2017-09-06 17:27:27 -07:00
page_io.c	Merge branch 'for-4.14/block' of git://git.kernel.dk/linux-block	2017-09-07 11:59:42 -07:00
page_isolation.c	mm: unify new_node_page and alloc_migrate_target	2017-07-10 16:32:31 -07:00
page_owner.c	mm, page_owner: skip unnecessary stack_trace entries	2017-09-13 18:53:16 -07:00
page_poison.c	mm: enable page poisoning early at boot	2017-05-03 15:52:10 -07:00
page_vma_mapped.c	mm/migrate: support un-addressable ZONE_DEVICE page in migration	2017-09-08 18:26:46 -07:00
page-writeback.c	mm: rename global_page_state to global_zone_page_state	2017-09-06 17:27:29 -07:00
pagewalk.c	mm/hugetlb: add size parameter to huge_pte_offset()	2017-07-06 16:24:34 -07:00
percpu-internal.h	percpu: skip chunks if the alloc does not fit in the contig hint	2017-07-26 17:41:05 -04:00
percpu-km.c	percpu: replace area map allocator with bitmap	2017-07-26 17:41:05 -04:00
percpu-stats.c	percpu: fix starting offset for chunk statistics traversal	2017-09-27 14:45:57 -07:00
percpu-vm.c	percpu: fix static checker warnings in pcpu_destroy_chunk	2017-06-29 11:23:38 -04:00
percpu.c	mm, percpu: add support for __GFP_NOWARN flag	2017-10-19 13:13:49 +01:00
pgtable-generic.c	mm: thp: enable thp migration in generic path	2017-09-08 18:26:45 -07:00
process_vm_access.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/mm.h>	2017-03-02 08:42:28 +01:00
quicklist.c	fix Christoph's email addresses	2016-03-17 15:09:34 -07:00
readahead.c	mm: don't cap request size based on read-ahead setting	2016-12-12 18:55:08 -08:00
rmap.c	lib/interval_tree: fast overlap detection	2017-09-08 18:26:49 -07:00
rodata_test.c	mm: fix RODATA_TEST failure "rodata_test: test data was not read only"	2017-10-03 17:54:24 -07:00
shmem.c	mm: treewide: remove GFP_TEMPORARY allocation flag	2017-09-13 18:53:16 -07:00
slab_common.c	mm: memcontrol: use vmalloc fallback for large kmem memcg arrays	2017-10-03 17:54:25 -07:00
slab.c	mm: memcontrol: account slab stats per lruvec	2017-07-06 16:24:35 -07:00
slab.h	locking/lockdep: Rework FS_RECLAIM annotation	2017-08-10 12:29:03 +02:00
slob.c	locking/lockdep: Rework FS_RECLAIM annotation	2017-08-10 12:29:03 +02:00
slub.c	mm: treewide: remove GFP_TEMPORARY allocation flag	2017-09-13 18:53:16 -07:00
sparse-vmemmap.c	mm, sparse, page_ext: drop ugly N_HIGH_MEMORY branches for allocations	2017-09-06 17:27:26 -07:00
sparse.c	mm/sparse.c: fix typo in online_mem_sections	2017-09-08 18:26:47 -07:00
swap_cgroup.c	mm, THP, swap: delay splitting THP during swap out	2017-07-06 16:24:31 -07:00
swap_slots.c	mm/swap_slots.c: don't disable preemption while taking the per-CPU cache	2017-07-10 16:32:32 -07:00
swap_state.c	mm: fix data corruption caused by lazyfree page	2017-10-03 17:54:25 -07:00
swap.c	mm: avoid marking swap cached page as lazyfree	2017-10-03 17:54:24 -07:00
swapfile.c	mm/swapfile.c: fix swapon frontswap_map memory leak on error	2017-09-08 18:26:47 -07:00
truncate.c	mm/truncate.c: fix THP handling in invalidate_mapping_pages()	2017-07-10 16:32:32 -07:00
usercopy.c	mm/usercopy: Drop extra is_vmalloc_or_module() check	2017-04-05 12:30:18 -07:00
userfaultfd.c	userfaultfd: shmem: wire up shmem_mfill_zeropage_pte	2017-09-06 17:27:28 -07:00
util.c	mm: rename global_page_state to global_zone_page_state	2017-09-06 17:27:29 -07:00
vmacache.c	sched/headers: Prepare to move 'init_task' and 'init_thread_union' from <linux/sched.h> to <linux/sched/task.h>	2017-03-02 08:42:38 +01:00
vmalloc.c	mm/vmalloc.c: don't reinvent the wheel but use existing llist API	2017-09-06 17:27:29 -07:00
vmpressure.c	mm, vmpressure: pass-through notification support	2017-07-10 16:32:31 -07:00
vmscan.c	mm, THP, swap: add THP swapping out fallback counting	2017-09-06 17:27:28 -07:00
vmstat.c	mm: consider the number in local CPUs when reading NUMA stats	2017-09-08 18:26:47 -07:00
workingset.c	mm: memcontrol: per-lruvec stats infrastructure	2017-07-06 16:24:35 -07:00
z3fold.c	z3fold: fix stale list handling	2017-10-03 17:54:24 -07:00
zbud.c	mm/zbud.c: use list_last_entry() instead of list_tail_entry()	2016-01-15 11:40:52 -08:00
zpool.c	mm: zsmalloc: constify struct zs_pool name	2015-11-06 17:50:42 -08:00
zsmalloc.c	mm/zsmalloc.c: change stat type parameter to int	2017-09-08 18:26:47 -07:00
zswap.c	mm/zswap.c: delete an error message for a failed memory allocation in zswap_dstmem_prepare()	2017-07-06 16:24:35 -07:00