linux-kernel - Re: [PATCH v2 1/4] staging: media: tegra-vde: Remove BIT() macro from UAPI header

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Date:   Tue, 18 Jun 2019 11:23:13 -0700
From:   Joe Perches <joe@...ches.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Johannes Berg <johannes@...solutions.net>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>
Subject: Re: [PATCH v2 1/4] staging: media: tegra-vde: Remove BIT() macro
 from UAPI header

On Tue, 2019-06-18 at 19:14 +0300, Dmitry Osipenko wrote:
> The BIT macro isn't available in userspace. Checkpatch complains about
> shifts being used instead of the macro and people are starting to send
> patches without realizing that it's a UAPI header file. Hence let's
> replace the BIT macro with a hex values to make everyone happy.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/staging/media/tegra-vde/uapi.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/media/tegra-vde/uapi.h b/drivers/staging/media/tegra-vde/uapi.h
> index a0dad1ed94ef..dd3e4a8c9f7e 100644
> --- a/drivers/staging/media/tegra-vde/uapi.h
> +++ b/drivers/staging/media/tegra-vde/uapi.h
> @@ -6,8 +6,8 @@
>  #include <linux/types.h>
>  #include <asm/ioctl.h>
>  
> -#define FLAG_B_FRAME		BIT(0)
> -#define FLAG_REFERENCE		BIT(1)
> +#define FLAG_B_FRAME		0x1
> +#define FLAG_REFERENCE		0x2
>  
>  struct tegra_vde_h264_frame {
>  	__s32 y_fd;

The BIT macro is already used quite a bit in uapi headers.
I imagine all those need fixup...

$ git grep -P '\bBIT\s*\(' include/uapi
include/uapi/linux/bpf.h:#define BPF_FIB_LOOKUP_DIRECT  BIT(0)
include/uapi/linux/bpf.h:#define BPF_FIB_LOOKUP_OUTPUT  BIT(1)
include/uapi/linux/coresight-stm.h:#define STM_FLAG_TIMESTAMPED   BIT(3)
include/uapi/linux/coresight-stm.h:#define STM_FLAG_GUARANTEED    BIT(7)
include/uapi/linux/nl80211.h: * bitmask of BIT(NL80211_BAND_*) as described in %enum
include/uapi/linux/pkt_sched.h:#define TC_ETF_DEADLINE_MODE_ON  BIT(0)
include/uapi/linux/pkt_sched.h:#define TC_ETF_OFFLOAD_ON        BIT(1)
include/uapi/linux/psci.h:#define PSCI_1_0_OS_INITIATED                 BIT(0)
include/uapi/linux/serio.h:#define SERIO_TIMEOUT        BIT(0)
include/uapi/linux/serio.h:#define SERIO_PARITY BIT(1)
include/uapi/linux/serio.h:#define SERIO_FRAME  BIT(2)
include/uapi/linux/serio.h:#define SERIO_OOB_DATA       BIT(3)
include/uapi/linux/tc_act/tc_ctinfo.h:  CTINFO_MODE_DSCP        = BIT(0),
include/uapi/linux/tc_act/tc_ctinfo.h:  CTINFO_MODE_CPMARK      = BIT(1)