[PATCH 0/2] nfs: refactor bit operations using clear_and_wake_up_bit

[Arnaud Bonnet <abo@medichon.fr>]

Several functions in nfs code use the exact following sequence of calls
when dealing with flags:
	
	clear_bit_unlock();
	smp_mb__after_atomic();
	wake_up_bit();

Since commit 8236b0ae31c8 ("bdi: wake up concurrent wb_shutdown()
callers.") came the helper clear_and_wake_up_bit() for this exact
purpose, and has since been adopted by several subsystems, including
vfs.

This function is already used in files such as nfs4state.c and
pnfs_nfs.c and this serie aims to continue this effort, which also
allows to remove some no longer used code.

Tested on x86 hardware using a loopback pNFS SCSI layout:
* doing image compression/decompression using xz and
* recompiling tinyconfig kernels on the remounted partition
No error reported under sanitizers.

Suggested-by: Agatha Isabelle Moreira <code@agatha.dev>
Link: https://kernelnewbies.org/Beginner%20Cleanup%20and%20Refactor%20Tasks%20by%20Agatha%20Isabelle%20Moreira#task_007
Signed-off-by: Arnaud Bonnet <abo@medichon.fr>
---

Arnaud Bonnet (2):
  nfs: replace atomic bitops sequence with clear_and_wake_up_bit helper
  nfs: refactor pNFS functions using clear_and_wake_up_bit

 fs/nfs/inode.c |  4 +---
 fs/nfs/pnfs.c  | 35 ++++++++++-------------------------
 2 files changed, 11 insertions(+), 28 deletions(-)

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2.53.0