linux-kernel - Re: [PATCH] ice: use min() to make code cleaner in ice

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Message-ID: <8822dfa2-bdb8-fceb-e920-94afb50881e8@intel.com>
Date:   Fri, 18 Mar 2022 13:19:26 -0700
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     Wan Jiabing <wanjiabing@...o.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Jakub Kicinski" <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ice: use min() to make code cleaner in ice_gnss


On 3/18/2022 2:46 AM, Wan Jiabing wrote:
> Fix the following coccicheck warning:
> ./drivers/net/ethernet/intel/ice/ice_gnss.c:79:26-27: WARNING opportunity for min()
>
> Use min() to make code cleaner.
>
> Signed-off-by: Wan Jiabing <wanjiabing@...o.com>

There are build issues with this patch:

In file included from ./include/linux/kernel.h:26,
                  from drivers/net/ethernet/intel/ice/ice.h:9,
                  from drivers/net/ethernet/intel/ice/ice_gnss.c:4:
drivers/net/ethernet/intel/ice/ice_gnss.c: In function ‘ice_gnss_read’:
./include/linux/minmax.h:20:35: error: comparison of distinct pointer 
types lacks a cast [-Werror]
    20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
       |                                   ^~
./include/linux/minmax.h:26:18: note: in expansion of macro ‘__typecheck’
    26 |                 (__typecheck(x, y) && __no_side_effects(x, y))
       |                  ^~~~~~~~~~~
./include/linux/minmax.h:36:31: note: in expansion of macro ‘__safe_cmp’
    36 |         __builtin_choose_expr(__safe_cmp(x, y), \
       |                               ^~~~~~~~~~
./include/linux/minmax.h:45:25: note: in expansion of macro ‘__careful_cmp’
    45 | #define min(x, y)       __careful_cmp(x, y, <)
       |                         ^~~~~~~~~~~~~
drivers/net/ethernet/intel/ice/ice_gnss.c:79:30: note: in expansion of 
macro ‘min’
    79 |                 bytes_read = min(bytes_left, 
ICE_MAX_I2C_DATA_SIZE);
       |                              ^~~
cc1: all warnings being treated as errors