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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>		7 years ago
..
kasan	Merge branch 'linus' into locking/core, to pick up fixes	7 years ago
Kconfig	mm/hmm: avoid bloating arch that do not make use of HMM	7 years ago
Kconfig.debug	mm: enable page poisoning early at boot	8 years ago
Makefile	mm/hmm: avoid bloating arch that do not make use of HMM	7 years ago
backing-dev.c	mm/backing-dev.c: fix an error handling path in 'cgwb_create()'	7 years ago
balloon_compaction.c	mm/migrate: new migrate mode MIGRATE_SYNC_NO_COPY	7 years ago
bootmem.c	mm/bootmem.c: cosmetic improvement of code readability	8 years ago
cleancache.c	fs: switch ->s_uuid to uuid_t	8 years ago
cma.c	cma: fix calculation of aligned offset	8 years ago
cma.h	cma: Store a name in the cma structure	8 years ago
cma_debug.c	mm/cma_debug.c: fix stack corruption due to sprintf usage	7 years ago
compaction.c	mm,compaction: serialize waitqueue_active() checks (for real)	7 years ago
debug.c	mm: make tlb_flush_pending global	7 years ago
debug_page_ref.c	…
dmapool.c	lib/vsprintf.c: remove %Z support	8 years ago
early_ioremap.c	x86/mm: Add support to access boot related data in the clear	8 years ago
fadvise.c	mm: fadvise: avoid fadvise for fs without backing device	7 years ago
failslab.c	…
filemap.c	mm: have filemap_check_and_advance_wb_err clear AS_EIO/AS_ENOSPC	7 years ago
frame_vector.c	treewide: use kv[mz]alloc* rather than opencoded variants	8 years ago
frontswap.c	…
gup.c	mm/device-public-memory: device memory cache coherent with CPU	7 years ago
highmem.c	…
hmm.c	mm/hmm: avoid bloating arch that do not make use of HMM	7 years ago
huge_memory.c	mm: soft-dirty: keep soft-dirty bits over thp migration	7 years ago
hugetlb.c	powerpc updates for 4.14	7 years ago
hugetlb_cgroup.c	…
hwpoison-inject.c	mm: hwpoison: call shake_page() unconditionally	8 years ago
init-mm.c	…
internal.h	mm, oom: do not rely on TIF_MEMDIE for memory reserves access	7 years ago
interval_tree.c	lib/interval_tree: fast overlap detection	7 years ago
khugepaged.c	mm: make PR_SET_THP_DISABLE immediately active	8 years ago
kmemcheck.c	mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU	8 years ago
kmemleak-test.c	…
kmemleak.c	mm: kmemleak: treat vm_struct as alternative reference to vmalloc'ed objects	8 years ago
ksm.c	ksm: fix unlocked iteration over vmas in cmp_and_merge_page()	7 years ago
list_lru.c	mm: memcontrol: use vmalloc fallback for large kmem memcg arrays	7 years ago
maccess.c	…
madvise.c	mm, hugetlb, soft_offline: save compound page order before page migration	7 years ago
memblock.c	mm/memblock.c: reversed logic in memblock_discard()	7 years ago
memcontrol.c	net: memcontrol: defer call to mem_cgroup_sk_alloc()	7 years ago
memory-failure.c	x86/mm, mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings of poison pages	7 years ago
memory.c	mm/device-public-memory: fix edge case in _vm_normal_page()	7 years ago
memory_hotplug.c	mm/memory_hotplug: define find_{smallest|biggest}_section_pfn as unsigned long	7 years ago
mempolicy.c	mm/mempolicy.c: remove BUG_ON() checks for VMA inside mpol_misplaced()	7 years ago
mempool.c	sched/wait: Rename wait_queue_t => wait_queue_entry_t	8 years ago
memtest.c	…
migrate.c	mm/hmm: avoid bloating arch that do not make use of HMM	7 years ago
mincore.c	mm: remove shmem_mapping() shmem_zero_setup() duplicates	8 years ago
mlock.c	mm/mlock.c: use page_zone() instead of page_zone_id()	7 years ago
mm_init.c	…
mmap.c	lib/interval_tree: fast overlap detection	7 years ago
mmu_context.c	sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h>	8 years ago
mmu_notifier.c	mm/mmu_notifier: kill invalidate_page	7 years ago
mmzone.c	…
mprotect.c	mm/ZONE_DEVICE: new type of ZONE_DEVICE for unaddressable memory	7 years ago
mremap.c	mm: thp: check pmd migration entry in common path	7 years ago
msync.c	…
nobootmem.c	mm: discard memblock data later	7 years ago
nommu.c	Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	7 years ago
oom_kill.c	mm, oom_reaper: skip mm structs with mmu notifiers	7 years ago
page-writeback.c	mm: rename global_page_state to global_zone_page_state	7 years ago
page_alloc.c	mm, page_alloc: add scheduling point to memmap_init_zone	7 years ago
page_counter.c	…
page_ext.c	mm, page_ext: periodically reschedule during page_ext_init()	7 years ago
page_idle.c	mm/page_idle.c: constify attribute_group structures	7 years ago
page_io.c	Merge branch 'for-4.14/block' of git://git.kernel.dk/linux-block	7 years ago
page_isolation.c	mm: unify new_node_page and alloc_migrate_target	8 years ago
page_owner.c	mm, page_owner: skip unnecessary stack_trace entries	7 years ago
page_poison.c	mm: enable page poisoning early at boot	8 years ago
page_vma_mapped.c	mm/migrate: support un-addressable ZONE_DEVICE page in migration	7 years ago
pagewalk.c	mm/hugetlb: add size parameter to huge_pte_offset()	8 years ago
percpu-internal.h	percpu: skip chunks if the alloc does not fit in the contig hint	8 years ago
percpu-km.c	percpu: replace area map allocator with bitmap	8 years ago
percpu-stats.c	percpu: fix starting offset for chunk statistics traversal	7 years ago
percpu-vm.c	percpu: fix static checker warnings in pcpu_destroy_chunk	8 years ago
percpu.c	mm, percpu: add support for __GFP_NOWARN flag	7 years ago
pgtable-generic.c	mm: thp: enable thp migration in generic path	7 years ago
process_vm_access.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/mm.h>	8 years ago
quicklist.c	…
readahead.c	…
rmap.c	lib/interval_tree: fast overlap detection	7 years ago
rodata_test.c	mm: fix RODATA_TEST failure "rodata_test: test data was not read only"	7 years ago
shmem.c	mm: treewide: remove GFP_TEMPORARY allocation flag	7 years ago
slab.c	mm: memcontrol: account slab stats per lruvec	8 years ago
slab.h	locking/lockdep: Rework FS_RECLAIM annotation	7 years ago
slab_common.c	mm: memcontrol: use vmalloc fallback for large kmem memcg arrays	7 years ago
slob.c	locking/lockdep: Rework FS_RECLAIM annotation	7 years ago
slub.c	mm: treewide: remove GFP_TEMPORARY allocation flag	7 years ago
sparse-vmemmap.c	mm, sparse, page_ext: drop ugly N_HIGH_MEMORY branches for allocations	7 years ago
sparse.c	mm/sparse.c: fix typo in online_mem_sections	7 years ago
swap.c	mm: avoid marking swap cached page as lazyfree	7 years ago
swap_cgroup.c	mm, THP, swap: delay splitting THP during swap out	8 years ago
swap_slots.c	mm/swap_slots.c: don't disable preemption while taking the per-CPU cache	8 years ago
swap_state.c	mm: fix data corruption caused by lazyfree page	7 years ago
swapfile.c	mm/swapfile.c: fix swapon frontswap_map memory leak on error	7 years ago
truncate.c	mm/truncate.c: fix THP handling in invalidate_mapping_pages()	8 years ago
usercopy.c	mm/usercopy: Drop extra is_vmalloc_or_module() check	8 years ago
userfaultfd.c	userfaultfd: shmem: wire up shmem_mfill_zeropage_pte	7 years ago
util.c	mm: rename global_page_state to global_zone_page_state	7 years ago
vmacache.c	sched/headers: Prepare to move 'init_task' and 'init_thread_union' from <linux/sched.h> to <linux/sched/task.h>	8 years ago
vmalloc.c	mm/vmalloc.c: don't reinvent the wheel but use existing llist API	7 years ago
vmpressure.c	mm, vmpressure: pass-through notification support	8 years ago
vmscan.c	mm, THP, swap: add THP swapping out fallback counting	7 years ago
vmstat.c	mm: consider the number in local CPUs when reading NUMA stats	7 years ago
workingset.c	mm: memcontrol: per-lruvec stats infrastructure	8 years ago
z3fold.c	z3fold: fix stale list handling	7 years ago
zbud.c	…
zpool.c	…
zsmalloc.c	mm/zsmalloc.c: change stat type parameter to int	7 years ago
zswap.c	mm/zswap.c: delete an error message for a failed memory allocation in zswap_dstmem_prepare()	8 years ago