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dm writecache: add cond_resched to avoid CPU hangs

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commit 1edaa447d9 upstream.

Initializing a dm-writecache device can take a long time when the
persistent memory device is large.  Add cond_resched() to a few loops
to avoid warnings that the CPU is stuck.

Cc: stable@vger.kernel.org # v4.18+
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mikulas Patocka
2020-03-27 07:22:36 -04:00
committed by Greg Kroah-Hartman
parent 5c84ab9c96
commit bef0d2f5fd
1 changed files with 5 additions and 1 deletions
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6
drivers/md/dm-writecache.c
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@@ -872,6 +872,7 @@ static int writecache_alloc_entries(struct dm_writecache *wc)
struct wc_entry *e = &wc->entries[b];
e->index = b;
e->write_in_progress = false;
cond_resched();
}
return 0;
@@ -926,6 +927,7 @@ static void writecache_resume(struct dm_target *ti)
e->original_sector = le64_to_cpu(wme.original_sector);
e->seq_count = le64_to_cpu(wme.seq_count);
}
cond_resched();
}
#endif
for (b = 0; b < wc->n_blocks; b++) {
@@ -1770,8 +1772,10 @@ static int init_memory(struct dm_writecache *wc)
pmem_assign(sb(wc)->n_blocks, cpu_to_le64(wc->n_blocks));
pmem_assign(sb(wc)->seq_count, cpu_to_le64(0));
for (b = 0; b < wc->n_blocks; b++)
for (b = 0; b < wc->n_blocks; b++) {
write_original_sector_seq_count(wc, &wc->entries[b], -1, -1);
cond_resched();
}
writecache_flush_all_metadata(wc);
writecache_commit_flushed(wc, false);