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    Subject[PATCH 5.4 173/261] mm: call cond_resched() from deferred_init_memmap()
    Date
    From: Pavel Tatashin <pasha.tatashin@soleen.com>

    commit da97f2d56bbd880b4138916a7ef96f9881a551b2 upstream.

    Now that deferred pages are initialized with interrupts enabled we can
    replace touch_nmi_watchdog() with cond_resched(), as it was before
    3a2d7fa8a3d5.

    For now, we cannot do the same in deferred_grow_zone() as it is still
    initializes pages with interrupts disabled.

    This change fixes RCU problem described in
    https://lkml.kernel.org/r/20200401104156.11564-2-david@redhat.com

    [ 60.474005] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
    [ 60.475000] rcu: 1-...0: (0 ticks this GP) idle=02a/1/0x4000000000000000 softirq=1/1 fqs=15000
    [ 60.475000] rcu: (detected by 0, t=60002 jiffies, g=-1199, q=1)
    [ 60.475000] Sending NMI from CPU 0 to CPUs 1:
    [ 1.760091] NMI backtrace for cpu 1
    [ 1.760091] CPU: 1 PID: 20 Comm: pgdatinit0 Not tainted 4.18.0-147.9.1.el8_1.x86_64 #1
    [ 1.760091] Hardware name: Red Hat KVM, BIOS 1.13.0-1.module+el8.2.0+5520+4e5817f3 04/01/2014
    [ 1.760091] RIP: 0010:__init_single_page.isra.65+0x10/0x4f
    [ 1.760091] Code: 48 83 cf 63 48 89 f8 0f 1f 40 00 48 89 c6 48 89 d7 e8 6b 18 80 ff 66 90 5b c3 31 c0 b9 10 00 00 00 49 89 f8 48 c1 e6 33 f3 ab <b8> 07 00 00 00 48 c1 e2 36 41 c7 40 34 01 00 00 00 48 c1 e0 33 41
    [ 1.760091] RSP: 0000:ffffba783123be40 EFLAGS: 00000006
    [ 1.760091] RAX: 0000000000000000 RBX: fffffad34405e300 RCX: 0000000000000000
    [ 1.760091] RDX: 0000000000000000 RSI: 0010000000000000 RDI: fffffad34405e340
    [ 1.760091] RBP: 0000000033f3177e R08: fffffad34405e300 R09: 0000000000000002
    [ 1.760091] R10: 000000000000002b R11: ffff98afb691a500 R12: 0000000000000002
    [ 1.760091] R13: 0000000000000000 R14: 000000003f03ea00 R15: 000000003e10178c
    [ 1.760091] FS: 0000000000000000(0000) GS:ffff9c9ebeb00000(0000) knlGS:0000000000000000
    [ 1.760091] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [ 1.760091] CR2: 00000000ffffffff CR3: 000000a1cf20a001 CR4: 00000000003606e0
    [ 1.760091] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    [ 1.760091] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    [ 1.760091] Call Trace:
    [ 1.760091] deferred_init_pages+0x8f/0xbf
    [ 1.760091] deferred_init_memmap+0x184/0x29d
    [ 1.760091] ? deferred_free_pages.isra.97+0xba/0xba
    [ 1.760091] kthread+0x112/0x130
    [ 1.760091] ? kthread_flush_work_fn+0x10/0x10
    [ 1.760091] ret_from_fork+0x35/0x40
    [ 89.123011] node 0 initialised, 1055935372 pages in 88650ms

    Fixes: 3a2d7fa8a3d5 ("mm: disable interrupts while initializing deferred pages")
    Reported-by: Yiqian Wei <yiwei@redhat.com>
    Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Tested-by: David Hildenbrand <david@redhat.com>
    Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
    Reviewed-by: David Hildenbrand <david@redhat.com>
    Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
    Acked-by: Michal Hocko <mhocko@suse.com>
    Cc: Dan Williams <dan.j.williams@intel.com>
    Cc: James Morris <jmorris@namei.org>
    Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
    Cc: Sasha Levin <sashal@kernel.org>
    Cc: Shile Zhang <shile.zhang@linux.alibaba.com>
    Cc: Vlastimil Babka <vbabka@suse.cz>
    Cc: <stable@vger.kernel.org> [4.17+]
    Link: http://lkml.kernel.org/r/20200403140952.17177-4-pasha.tatashin@soleen.com
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    mm/page_alloc.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/mm/page_alloc.c
    +++ b/mm/page_alloc.c
    @@ -1817,7 +1817,7 @@ static int __init deferred_init_memmap(v
    */
    while (spfn < epfn) {
    nr_pages += deferred_init_maxorder(&i, zone, &spfn, &epfn);
    - touch_nmi_watchdog();
    + cond_resched();
    }
    zone_empty:
    /* Sanity check that the next zone really is unpopulated */

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