linux-kernel - [PATCH v3 0/8] Replace strncmp with str_has

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Date:   Mon,  5 Aug 2019 20:22:04 +0800
From:   Chuhong Yuan <hslester96@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Jessica Yu <jeyu@...nel.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joe Perches <joe@...ches.com>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        iommu@...ts.linux-foundation.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Chuhong Yuan <hslester96@...il.com>
Subject: [PATCH v3 0/8] Replace strncmp with str_has_prefix

The commit 72921427d46b
("string.h: Add str_has_prefix() helper function")
introduced str_has_prefix() to substitute error-prone
strncmp(str, const, len).

strncmp(str, const, len) is easy to have error in len
because of counting error or sizeof(const) without - 1.

These patches replace such pattern with str_has_prefix()
to avoid hard coded constant length and sizeof.

Besides, str_has_prefix() returns the length of prefix
when the comparison returns true.
We can use this return value to substitute some hard-coding.

Changelog:

v1 -> v2:
  - Revise the description.
  - Use the return value of str_has_prefix() to eliminate
    hard coding.
  - Remove possible false positives and add newly detected
    one in upstream.

v2 -> v3:
  - Revise the description.
  - Remove else uses in printk.c.

Chuhong Yuan (8):
  dma: debug: Replace strncmp with str_has_prefix
  module: Replace strncmp with str_has_prefix
  PM/sleep: Replace strncmp with str_has_prefix
  printk: Replace strncmp with str_has_prefix
  reboot: Replace strncmp with str_has_prefix
  sched: Replace strncmp with str_has_prefix
  userns: Replace strncmp with str_has_prefix
  watchdog: Replace strncmp with str_has_prefix

 kernel/dma/debug.c       |  2 +-
 kernel/module.c          |  2 +-
 kernel/power/main.c      |  2 +-
 kernel/printk/braille.c  | 10 ++++++----
 kernel/printk/printk.c   | 19 +++++++++++++------
 kernel/reboot.c          |  6 ++++--
 kernel/sched/debug.c     |  5 +++--
 kernel/sched/isolation.c |  9 +++++----
 kernel/user_namespace.c  | 10 +++++-----
 kernel/watchdog.c        |  8 ++++----
 10 files changed, 43 insertions(+), 30 deletions(-)

-- 
2.20.1