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md/raid1: protect sequential read hints for read balance

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The patch just suppress KCSAN noise. No functional change.

KCSAN reports a race, point to update_read_sectors() update next_seq_sect vs.
read next_seq_sect.

Protect next_seq_sect and seq_start with READ_ONCE/WRITE_ONCE, otherwise,
read balance see stale sequential-read hints.

KCSAN report:
==============
 BUG: KCSAN: data-race in raid1_read_request / raid1_read_request

 write to 0xffff8e3a2d6736d0 of 8 bytes by task 593784 on cpu 10:
  raid1_read_request+0xe5a/0x19f0
  raid1_make_request+0xdf/0x1990
  md_handle_request+0x4a2/0xa40
  [...]

 read to 0xffff8e3a2d6736d0 of 8 bytes by task 593776 on cpu 11:
  raid1_read_request+0xe3f/0x19f0
  raid1_make_request+0xdf/0x1990
  md_handle_request+0x4a2/0xa40
  [...]

 value changed: 0x0000000000356368 -> 0x0000000000356370

Signed-off-by: Chen Cheng <chencheng@fnnas.com>
Reviewed-by: Yu Kuai <yukuai@fygo.io>
Link: https://patch.msgid.link/20260623075940.2476255-1-chencheng@fnnas.com
Signed-off-by: Yu Kuai <yukuai@fygo.io>
This commit is contained in:
Chen Cheng 2026-06-23 15:59:40 +08:00 • committed by Yu Kuai
commit e12e619c2e
1 changed files with 10 additions and 8 deletions
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