netdev - Re: [PATCH net-next v2] ptp: ocp: Avoid operator precedence warning in ptp_ocp_summary

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Message-ID: <20210917054114.u7ivmjfdsw7ta72m@bsd-mbp.dhcp.thefacebook.com>
Date:   Thu, 16 Sep 2021 22:41:14 -0700
From:   Jonathan Lemon <jonathan.lemon@...il.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Richard Cochran <richardcochran@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH net-next v2] ptp: ocp: Avoid operator precedence warning
 in ptp_ocp_summary_show()

On Thu, Sep 16, 2021 at 09:52:05PM -0700, Nathan Chancellor wrote:
> Clang warns twice:
> 
> drivers/ptp/ptp_ocp.c:2065:16: error: operator '?:' has lower precedence
> than '&'; '&' will be evaluated first
> [-Werror,-Wbitwise-conditional-parentheses]
>                            on & map ? " ON" : "OFF", src);
>                            ~~~~~~~~ ^
> drivers/ptp/ptp_ocp.c:2065:16: note: place parentheses around the '&'
> expression to silence this warning
>                            on & map ? " ON" : "OFF", src);
>                                     ^
>                            (       )
> drivers/ptp/ptp_ocp.c:2065:16: note: place parentheses around the '?:'
> expression to evaluate it first
>                            on & map ? " ON" : "OFF", src);
>                                     ^
> 
> on and map are both booleans so this should be a logical AND, which
> clears up the operator precedence issue.
> 
> Fixes: a62a56d04e63 ("ptp: ocp: Enable 4th timestamper / PPS generator")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1457
> Suggested-by: Jonathan Lemon <jonathan.lemon@...il.com>
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>

Acked-by: Jonathan Lemon <jonathan.lemon@...il.com>