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Jan Kara 47e2093381 mm/filemap.c: don't bother dropping mmap_sem for zero size readahead 
commit 5c72feee3e upstream.

When handling a page fault, we drop mmap_sem to start async readahead so
that we don't block on IO submission with mmap_sem held.  However there's
no point to drop mmap_sem in case readahead is disabled.  Handle that case
to avoid pointless dropping of mmap_sem and retrying the fault.  This was
actually reported to block mlockall(MCL_CURRENT) indefinitely.

Fixes: 6b4c9f4469 ("filemap: drop the mmap_sem for all blocking operations")
Reported-by: Minchan Kim <minchan@kernel.org>
Reported-by: Robert Stupp <snazy@gmx.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Minchan Kim <minchan@kernel.org>
Link: http://lkml.kernel.org/r/20200212101356.30759-1-jack@suse.cz
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: SeongJae Park <sjpark@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2020-08-05 09:59:41 +02:00
..
kasan kasan: disable branch tracing for core runtime 2020-05-27 17:46:48 +02:00
Kconfig
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Kconfig.debug
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Makefile
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backing-dev.c bdi: add a ->dev_name field to struct backing_dev_info 2020-05-14 07:58:30 +02:00
balloon_compaction.c
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cleancache.c
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cma.c
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cma.h
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cma_debug.c
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compaction.c mm, compaction: make capture control handling safe wrt interrupts 2020-07-09 09:37:57 +02:00
debug.c mm/debug.c: always print flags in dump_page() 2020-03-05 16:43:51 +01:00
debug_page_ref.c
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dmapool.c
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early_ioremap.c
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fadvise.c
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failslab.c
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filemap.c mm/filemap.c: don't bother dropping mmap_sem for zero size readahead 2020-08-05 09:59:41 +02:00
frame_vector.c
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frontswap.c
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gup.c gup: document and work around "COW can break either way" issue 2020-06-17 16:40:30 +02:00
gup_benchmark.c mm/gup: fix memory leak in __gup_benchmark_ioctl 2020-01-09 10:20:00 +01:00
highmem.c
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hmm.c
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huge_memory.c mm: thp: make the THP mapcount atomic against __split_huge_pmd_locked() 2020-06-22 09:31:14 +02:00
hugetlb.c mm/hugetlb: fix a addressing exception caused by huge_pte_offset 2020-04-29 16:33:14 +02:00
hugetlb_cgroup.c
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hwpoison-inject.c
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init-mm.c
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internal.h mm: drop mmap_sem before calling balance_dirty_pages() in write fault 2020-01-09 10:19:55 +01:00
interval_tree.c
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khugepaged.c khugepaged: fix null-pointer dereference due to race 2020-07-29 10:18:44 +02:00
kmemleak-test.c
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kmemleak.c
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ksm.c mm/ksm: fix NULL pointer dereference when KSM zero page is enabled 2020-04-29 16:33:15 +02:00
list_lru.c
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maccess.c uaccess: Add non-pagefault user-space write function 2020-01-17 19:48:40 +01:00
madvise.c mm: do not allow MADV_PAGEOUT for CoW pages 2020-03-25 08:25:57 +01:00
memblock.c
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memcontrol.c mm/memcg: fix refcount error while moving and swapping 2020-07-29 10:18:43 +02:00
memfd.c
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memory-failure.c
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memory.c mm: drop mmap_sem before calling balance_dirty_pages() in write fault 2020-01-09 10:19:55 +01:00
memory_hotplug.c mm, hotplug: fix page online with DEBUG_PAGEALLOC compiled but not enabled 2020-03-12 13:00:19 +01:00
mempolicy.c mm: mempolicy: require at least one nodeid for MPOL_PREFERRED 2020-04-08 09:08:47 +02:00
mempool.c
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memremap.c mm/memory_hotplug: shrink zones when offlining memory 2020-01-09 10:19:56 +01:00
memtest.c
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migrate.c mm: move_pages: report the number of non-attempted pages 2020-02-11 04:35:13 -08:00
mincore.c
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mlock.c
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mm_init.c
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mmap.c mm/mmap.c: close race between munmap() and expand_upwards()/downwards() 2020-07-29 10:18:43 +02:00
mmu_context.c
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mmu_gather.c mm/mmu_gather: invalidate TLB correctly on batch allocation failure and flush 2020-02-11 04:35:42 -08:00
mmu_notifier.c
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mmzone.c
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mprotect.c mm, numa: fix bad pmd by atomically check for pmd_trans_huge when marking page tables prot_numa 2020-03-12 13:00:19 +01:00
mremap.c mm: Fix mremap not considering huge pmd devmap 2020-06-07 13:18:46 +02:00
msync.c
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nommu.c x86/mm: split vmalloc_sync_all() 2020-03-25 08:25:58 +01:00
oom_kill.c mm/oom: fix pgtables units mismatch in Killed process message 2020-01-09 10:19:57 +01:00
page-writeback.c mm/page-writeback.c: avoid potential division by zero in wb_min_max_ratio() 2020-01-23 08:22:41 +01:00
page_alloc.c mm: call cond_resched() from deferred_init_memmap() 2020-06-22 09:31:14 +02:00
page_counter.c
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page_ext.c
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page_idle.c
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page_io.c
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page_isolation.c
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page_owner.c
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page_poison.c
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page_vma_mapped.c
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pagewalk.c
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percpu-internal.h
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percpu-km.c
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percpu-stats.c
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percpu-vm.c
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percpu.c
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pgtable-generic.c
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process_vm_access.c
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readahead.c
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rmap.c
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rodata_test.c
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shmem.c shmem: fix possible deadlocks on shmlock_user_lock 2020-05-20 08:20:03 +02:00
shuffle.c
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shuffle.h
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slab.c mm, debug_pagealloc: don't rely on static keys too early 2020-01-23 08:22:40 +01:00
slab.h
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slab_common.c mm: memcg/slab: fix memory leak at non-root kmem_cache destroy 2020-07-29 10:18:44 +02:00
slob.c
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slub.c mm/slub: fix stack overruns with SLUB_STATS 2020-07-09 09:37:50 +02:00
sparse-vmemmap.c
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sparse.c mm/sparse: fix kernel crash with pfn_section_valid check 2020-04-01 11:02:03 +02:00
swap.c
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swap_cgroup.c
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swap_slots.c
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swap_state.c mm: fix swap cache node allocation mask 2020-07-09 09:37:49 +02:00
swapfile.c mm/swapfile.c: move inode_lock out of claim_swapfile 2020-04-01 11:02:02 +02:00
truncate.c
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usercopy.c
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userfaultfd.c
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util.c mm: add kvfree_sensitive() for freeing sensitive data objects 2020-06-17 16:40:23 +02:00
vmacache.c
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vmalloc.c vmalloc: fix remap_vmalloc_range() bounds checks 2020-04-29 16:33:14 +02:00
vmpressure.c
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vmscan.c mm/vmscan.c: don't round up scan size for online memory cgroup 2020-02-28 17:22:20 +01:00
vmstat.c
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workingset.c
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z3fold.c
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zbud.c
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zpool.c
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zsmalloc.c mm/zsmalloc.c: fix the migrated zspage statistics. 2020-01-09 10:19:56 +01:00
zswap.c
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