Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1687236

Re: [PATCH 13/14] iopoll: avoid -Wint-in-bool-context warning

Show all headers | View raw

On Fri, Jul 14, 2017 at 11:55 AM, Joe Perches <joe@perches.com> wrote:
> On Fri, 2017-07-14 at 11:31 +0200, Arnd Bergmann wrote:
>> When we pass the result of a multiplication as the timeout, we
>> can get a warning:
>>
>> drivers/mmc/host/bcm2835.c:596:149: error: '*' in boolean context, suggest '&&' instead [-Werror=int-in-bool-context]
>> drivers/mfd/arizona-core.c:247:195: error: '*' in boolean context, suggest '&&' instead [-Werror=int-in-bool-context]
>>
>> This is easy to avoid by comparing the timeout to zero instead,
>> making it a boolean expression.
>
> Perhaps this is better as != 0 if the multiply is signed.

I thought about that, but decided that as a negative timeout_us already
gives us rather random behavior (ktime_add_us() takes an unsigned
argument), the '>' comparison gives a more well-defined result by
ignoring the timeout.

         Arnd

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH 00/14] gcc-7 warnings Arnd Bergmann <arnd@arndb.de> - 2017-07-14 11:30 +0200
  [PATCH 05/14] isdn: isdnloop: suppress a gcc-7 warning Arnd Bergmann <arnd@arndb.de> - 2017-07-14 11:30 +0200
    Re: [PATCH 05/14] isdn: isdnloop: suppress a gcc-7 warning Joe Perches <joe@perches.com> - 2017-07-14 12:10 +0200
      Re: [PATCH 05/14] isdn: isdnloop: suppress a gcc-7 warning Arnd Bergmann <arnd@arndb.de> - 2017-07-14 12:40 +0200
        Re: [PATCH 05/14] isdn: isdnloop: suppress a gcc-7 warning Kevin Easton <kevin@guarana.org> - 2017-07-15 06:30 +0200
  [PATCH 04/14] x86: math-emu: avoid -Wint-in-bool-context warning Arnd Bergmann <arnd@arndb.de> - 2017-07-14 11:30 +0200
  [PATCH 07/14] proc/kcore: hide a harmless warning Arnd Bergmann <arnd@arndb.de> - 2017-07-14 11:30 +0200
    Re: [PATCH 07/14] proc/kcore: hide a harmless warning Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-07-14 14:30 +0200
  [PATCH 13/14] iopoll: avoid -Wint-in-bool-context warning Arnd Bergmann <arnd@arndb.de> - 2017-07-14 11:40 +0200
    Re: [PATCH 13/14] iopoll: avoid -Wint-in-bool-context warning Joe Perches <joe@perches.com> - 2017-07-14 12:00 +0200
      Re: [PATCH 13/14] iopoll: avoid -Wint-in-bool-context warning Arnd Bergmann <arnd@arndb.de> - 2017-07-14 12:30 +0200
  [PATCH 09/14] SFI: fix tautological-compare warning Arnd Bergmann <arnd@arndb.de> - 2017-07-14 11:40 +0200
  [PATCH 11/14] IB/uverbs: fix gcc-7 type warning Arnd Bergmann <arnd@arndb.de> - 2017-07-14 11:40 +0200
    Re: [PATCH 11/14] IB/uverbs: fix gcc-7 type warning Leon Romanovsky <leon@kernel.org> - 2017-07-14 11:50 +0200
  [PATCH 10/14] staging:iio:resolver:ad2s1210 fix negative IIO_ANGL_VEL read Arnd Bergmann <arnd@arndb.de> - 2017-07-14 11:40 +0200
    Re: [PATCH 10/14] staging:iio:resolver:ad2s1210 fix negative  IIO_ANGL_VEL read Jonathan Cameron <jic23@kernel.org> - 2017-07-15 13:50 +0200
  [PATCH 12/14] drm/nouveau/clk: fix gcc-7 -Wint-in-bool-context warning Arnd Bergmann <arnd@arndb.de> - 2017-07-14 11:40 +0200
  [PATCH 06/14] acpi: thermal: fix gcc-6/ccache warning Arnd Bergmann <arnd@arndb.de> - 2017-07-14 11:40 +0200
  [PATCH 08/14] Input: adxl34x - fix gcc-7 -Wint-in-bool-context warning Arnd Bergmann <arnd@arndb.de> - 2017-07-14 11:40 +0200
    Re: [PATCH 08/14] Input: adxl34x - fix gcc-7 -Wint-in-bool-context warning Linus Torvalds <torvalds@linux-foundation.org> - 2017-07-14 21:30 +0200
      Re: [PATCH 08/14] Input: adxl34x - fix gcc-7 -Wint-in-bool-context warning Arnd Bergmann <arnd@arndb.de> - 2017-07-14 22:20 +0200
        Re: [PATCH 08/14] Input: adxl34x - fix gcc-7 -Wint-in-bool-context  warning Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2017-07-14 23:50 +0200
  [PATCH 14/14] [media] fix warning on v4l2_subdev_call() result interpreted as bool Arnd Bergmann <arnd@arndb.de> - 2017-07-14 11:50 +0200
    Re: [PATCH 14/14] [media] fix warning on v4l2_subdev_call() result  interpreted as bool Dan Carpenter <dan.carpenter@oracle.com> - 2017-07-14 14:10 +0200
      Re: [PATCH 14/14] [media] fix warning on v4l2_subdev_call() result  interpreted as bool Arnd Bergmann <arnd@arndb.de> - 2017-07-14 14:30 +0200
        Re: [PATCH 14/14] [media] fix warning on v4l2_subdev_call() result  interpreted as bool Dan Carpenter <dan.carpenter@oracle.com> - 2017-07-14 15:00 +0200
          Re: [PATCH 14/14] [media] fix warning on v4l2_subdev_call() result  interpreted as bool Dan Carpenter <dan.carpenter@oracle.com> - 2017-07-14 15:20 +0200
            Re: [PATCH 14/14] [media] fix warning on v4l2_subdev_call() result  interpreted as bool Arnd Bergmann <arnd@arndb.de> - 2017-07-14 21:40 +0200
    Re: [PATCH 14/14] [media] fix warning on v4l2_subdev_call() result  interpreted as bool Dan Carpenter <dan.carpenter@oracle.com> - 2017-07-14 14:50 +0200
    Re: [PATCH 14/14] [media] fix warning on v4l2_subdev_call() result  interpreted as bool Hans Verkuil <hverkuil@xs4all.nl> - 2017-07-17 15:50 +0200
      Re: [PATCH 14/14] [media] fix warning on v4l2_subdev_call() result  interpreted as bool Arnd Bergmann <arnd@arndb.de> - 2017-07-17 16:30 +0200
        Re: [PATCH 14/14] [media] fix warning on v4l2_subdev_call() result  interpreted as bool Hans Verkuil <hverkuil@xs4all.nl> - 2017-07-17 16:40 +0200
          Re: [PATCH 14/14] [media] fix warning on v4l2_subdev_call() result  interpreted as bool Arnd Bergmann <arnd@arndb.de> - 2017-07-17 23:30 +0200
        Re: [PATCH 14/14] [media] fix warning on v4l2_subdev_call() result  interpreted as bool Dan Carpenter <dan.carpenter@oracle.com> - 2017-07-17 16:40 +0200
        Re: [PATCH 14/14] [media] fix warning on v4l2_subdev_call() result  interpreted as bool Hans Verkuil <hverkuil@xs4all.nl> - 2017-07-17 16:40 +0200
  Re: [PATCH 00/14] gcc-7 warnings Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-07-14 12:30 +0200

csiph-web