linux-kernel - Re: [PATCH 11/14] IB/uverbs: fix gcc-7 type warning

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Date:   Fri, 14 Jul 2017 12:46:31 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     linux-kernel@...r.kernel.org, Doug Ledford <dledford@...hat.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>, Guenter Roeck <linux@...ck-us.net>,
        linux-ide@...r.kernel.org, linux-media@...r.kernel.org,
        akpm@...ux-foundation.org, dri-devel@...ts.freedesktop.org,
        Matan Barak <matanb@...lanox.com>,
        Yishai Hadas <yishaih@...lanox.com>, linux-rdma@...r.kernel.org
Subject: Re: [PATCH 11/14] IB/uverbs: fix gcc-7 type warning

On Fri, Jul 14, 2017 at 11:31:04AM +0200, Arnd Bergmann wrote:
> When using ccache, we get a harmless warning about the fact that
> we use the result of a multiplication as a condition:
>
> drivers/infiniband/core/uverbs_main.c: In function 'ib_uverbs_write':
> drivers/infiniband/core/uverbs_main.c:787:40: error: '*' in boolean context, suggest '&&' instead [-Werror=int-in-bool-context]
> drivers/infiniband/core/uverbs_main.c:787:117: error: '*' in boolean context, suggest '&&' instead [-Werror=int-in-bool-context]
> drivers/infiniband/core/uverbs_main.c:790:50: error: '*' in boolean context, suggest '&&' instead [-Werror=int-in-bool-context]
> drivers/infiniband/core/uverbs_main.c:790:151: error: '*' in boolean context, suggest '&&' instead [-Werror=int-in-bool-context]
>
> This changes the macro to explicitly check the number for a positive
> length, which avoids the warning.
>
> Fixes: a96e4e2ffe43 ("IB/uverbs: New macro to set pointers to NULL if length is 0 in INIT_UDATA()")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/infiniband/core/uverbs.h | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
>

Thanks,
Reviewed-by: Leon Romanovsky <leonro@...lanox.com>

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