linux-kernel - Re: [PATCH] staging: wlan-ng: Avoid bitwise vs logical OR warning in hfa384x_usb

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Date:   Fri, 15 Oct 2021 12:43:44 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] staging: wlan-ng: Avoid bitwise vs logical OR warning in
 hfa384x_usb_throttlefn()

On Thu, Oct 14, 2021 at 02:57:03PM -0700, Nathan Chancellor wrote:
> A new warning in clang points out a place in this file where a bitwise
> OR is being used with boolean expressions:
> 
> In file included from drivers/staging/wlan-ng/prism2usb.c:2:
> drivers/staging/wlan-ng/hfa384x_usb.c:3787:7: warning: use of bitwise '|' with boolean operands [-Wbitwise-instead-of-logical]
>             ((test_and_clear_bit(THROTTLE_RX, &hw->usb_flags) &&
>             ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/staging/wlan-ng/hfa384x_usb.c:3787:7: note: cast one or both operands to int to silence this warning
> 1 warning generated.

Both sides of this bitwise OR are bool, so | and || are equivalent
logically.  Clang should not warn about it.

regards,
dan carpenter