linux-kernel - [PATCH 0/4] IB/mthca: Cleanup and optimize a few bitmap operation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 24 Nov 2021 21:40:09 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     dledford@...hat.com, jgg@...pe.ca
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH 0/4] IB/mthca: Cleanup and optimize a few bitmap operation

Patch 1 and 2 are just cleanups that uses 'bitmap_zalloc()' and 'bitmap_set()'
instead of hand-writing these functions.

Patch 3 and 4 are more questionable. They replace calls to '[set|clear]_bit()'
by their non-atomic '__[set|clear]_bit()' alternatives.
In both files, it looks safe to do so because accesses to the corresponding
bitmaps are protected by spinlocks.
However, these patches are compile tested only. It not sure it worth changing the
code just for saving a few atomic operations.
So review, test and apply only if it make sense.

Christophe JAILLET (4):
  IB/mthca: Use bitmap_zalloc() when applicable
  IB/mthca: Use bitmap_set() when applicable
  IB/mthca: Use non-atomic bitmap functions when possible in
    'mthca_allocator.c'
  IB/mthca: Use non-atomic bitmap functions when possible in
    'mthca_mr.c'

 drivers/infiniband/hw/mthca/mthca_allocator.c | 15 +++++--------
 drivers/infiniband/hw/mthca/mthca_mr.c        | 22 +++++++++----------
 2 files changed, 15 insertions(+), 22 deletions(-)

-- 
2.30.2