Re: [PATCH 00/45] media: Use string_choice helpers

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Hi Julia,

On 30/09/2024 16:36, Julia Lawall wrote:
> 
> 
> On Mon, 30 Sep 2024, Ricardo Ribalda wrote:
> 
>> On Mon, 30 Sept 2024 at 14:38, Hans Verkuil <hverkuil@xxxxxxxxx> wrote:
>>>
>>> On 30/09/2024 14:21, Laurent Pinchart wrote:
>>>> Hi Ricardo,
>>>>
>>>> On Mon, Sep 30, 2024 at 12:03:55PM +0000, Ricardo Ribalda wrote:
>>>>> include/linux/string_choices.h contains a set of helpers that can be
>>>>> used instead of hard coding some strings.
>>>>>
>>>>> Cocci has located some places where the helpers can be used. This
>>>>> patchset uses the diff generated by cocci, plus these changes:
>>>>
>>>> Personally I think most of those helpers just hinder readability for not
>>>> much added gain. String de-duplication is done by the linker already.
>>>> The only value I see in the helpers is ensuring that the strings are
>>>> consistently written, and I think we can do so through other means.
>>>
>>> Just my opinion: I'm OK with these new helpers, but I am not too keen to apply
>>> all this to existing source code. I.e., for new code it is fine, but if we have
>>> to update all drivers every time a new cocci test is added, then that will not
>>> scale.
>>>
>>> Note that I never ran cocci in my build scripts, so this is a new check that
>>> we haven't set rules for or have much experience with.
>>>
>>> checkpatch just checks the patches, it doesn't force you to fix existing code.
>>>
>>> Some of the cocci tests are clearly checking for incorrect code, but others are
>>> for code improvements (i.e. the code was correct, it can just be done slightly
>>> better). It's the second category were I think that should only apply to new code,
>>> and not existing code.
>>>
>>> Regards,
>>
>> Julia, correct me if I am wrong, but I believe that cocci does not
>> have the ability to check only new code. It runs against files not
>> diffs.
> 
> Coccinelle runs on files normally.  There is an option --use-patch-diff
> where you can give a commit id, and it should only work on the files
> mentioned in that commit, but it doesn't seem to focus on only the new
> code in that commit.

Is it possible to add support for that?

And a related question: is it possible to skip certain tests?

Basically, I don't want to see reports of code improvements, unless it is
for a new source file. Reports of dangerous/wrong constructs are always
welcome, but code improvements like these string_choice helpers really only
make sense for patches adding new source files.

Regards,

	Hans

> 
> julia
> 
>>
>> I agree with you, a "improvement cocci" shall not force us to drop the
>> pen and work full time to fix it :)
>> When a new "improvement" cocci check is landed, we should update our
>> "allowlist" immediately to ignore those warnings until we slowly
>> improve our codebase to meet the standard.
>> That way the CI is not affected.
>>
>> Regarding this patchset.... It is pretty big, but also pretty simple.
>> I added my "extra changes" on the cover letter to ease the review.
>>
>> If you or someone else have time to review it... then it will be great
>> if we land it. But if none has time for it, then it can be ignored.
>>
>>
>> Regards!
>>
>>>
>>>         Hans
>>>
>>>>
>>>>> diff --git a/drivers/media/dvb-frontends/ascot2e.c b/drivers/media/dvb-frontends/ascot2e.c
>>>>> index 8c3eb5d69dda..ec7a718428fc 100644
>>>>> --- a/drivers/media/dvb-frontends/ascot2e.c
>>>>> +++ b/drivers/media/dvb-frontends/ascot2e.c
>>>>> @@ -104,7 +104,7 @@ static void ascot2e_i2c_debug(struct ascot2e_priv *priv,
>>>>>                               u8 reg, u8 write, const u8 *data, u32 len)
>>>>>  {
>>>>>         dev_dbg(&priv->i2c->dev, "ascot2e: I2C %s reg 0x%02x size %d\n",
>>>>> -               str_read_write(write == 0), reg, len);
>>>>> +               str_write_read(write), reg, len);
>>>>>         print_hex_dump_bytes("ascot2e: I2C data: ",
>>>>>                 DUMP_PREFIX_OFFSET, data, len);
>>>>>  }
>>>>> diff --git a/drivers/media/dvb-frontends/cxd2841er.c b/drivers/media/dvb-frontends/cxd2841er.c
>>>>> index db684f314b47..d1b84cd9c510 100644
>>>>> --- a/drivers/media/dvb-frontends/cxd2841er.c
>>>>> +++ b/drivers/media/dvb-frontends/cxd2841er.c
>>>>> @@ -206,7 +206,7 @@ static void cxd2841er_i2c_debug(struct cxd2841er_priv *priv,
>>>>>  {
>>>>>         dev_dbg(&priv->i2c->dev,
>>>>>                 "cxd2841er: I2C %s addr %02x reg 0x%02x size %d data %*ph\n",
>>>>> -               str_read_write(write == 0), addr, reg, len, len, data);
>>>>> +               str_write_read(write), addr, reg, len, len, data);
>>>>>  }
>>>>>
>>>>>  static int cxd2841er_write_regs(struct cxd2841er_priv *priv,
>>>>> diff --git a/drivers/media/dvb-frontends/helene.c b/drivers/media/dvb-frontends/helene.c
>>>>> index 52198cb49dba..b4527c141d9c 100644
>>>>> --- a/drivers/media/dvb-frontends/helene.c
>>>>> +++ b/drivers/media/dvb-frontends/helene.c
>>>>> @@ -279,7 +279,7 @@ static void helene_i2c_debug(struct helene_priv *priv,
>>>>>                 u8 reg, u8 write, const u8 *data, u32 len)
>>>>>  {
>>>>>         dev_dbg(&priv->i2c->dev, "helene: I2C %s reg 0x%02x size %d\n",
>>>>> -                       str_read_write(write == 0), reg, len);
>>>>> +                       str_write_read(write), reg, len);
>>>>>         print_hex_dump_bytes("helene: I2C data: ",
>>>>>                         DUMP_PREFIX_OFFSET, data, len);
>>>>>  }
>>>>> diff --git a/drivers/media/dvb-frontends/horus3a.c b/drivers/media/dvb-frontends/horus3a.c
>>>>> index 84385079918c..10300ebf3ca0 100644
>>>>> --- a/drivers/media/dvb-frontends/horus3a.c
>>>>> +++ b/drivers/media/dvb-frontends/horus3a.c
>>>>> @@ -38,7 +38,7 @@ static void horus3a_i2c_debug(struct horus3a_priv *priv,
>>>>>                               u8 reg, u8 write, const u8 *data, u32 len)
>>>>>  {
>>>>>         dev_dbg(&priv->i2c->dev, "horus3a: I2C %s reg 0x%02x size %d\n",
>>>>> -               str_read_write(write == 0), reg, len);
>>>>> +               str_write_read(write), reg, len);
>>>>>         print_hex_dump_bytes("horus3a: I2C data: ",
>>>>>                 DUMP_PREFIX_OFFSET, data, len);
>>>>>  }
>>>>> diff --git a/drivers/media/i2c/adv7842.c b/drivers/media/i2c/adv7842.c
>>>>> index ba174aa45afa..a43479c3ff03 100644
>>>>> --- a/drivers/media/i2c/adv7842.c
>>>>> +++ b/drivers/media/i2c/adv7842.c
>>>>> @@ -2763,7 +2763,7 @@ static int adv7842_cp_log_status(struct v4l2_subdev *sd)
>>>>>                           str_true_false(io_read(sd, 0x6a) & 0x10));
>>>>>         }
>>>>>         v4l2_info(sd, "CP free run: %s\n",
>>>>> -                 str_on_off(!!(cp_read(sd, 0xff) & 0x10)));
>>>>> +                 str_on_off(cp_read(sd, 0xff) & 0x10));
>>>>>         v4l2_info(sd, "Prim-mode = 0x%x, video std = 0x%x, v_freq = 0x%x\n",
>>>>>                   io_read(sd, 0x01) & 0x0f, io_read(sd, 0x00) & 0x3f,
>>>>>                   (io_read(sd, 0x01) & 0x70) >> 4);
>>>>> diff --git a/drivers/media/pci/saa7134/saa7134-cards.c b/drivers/media/pci/saa7134/saa7134-cards.c
>>>>> index 301b89e799d8..79cd61fb0205 100644
>>>>> --- a/drivers/media/pci/saa7134/saa7134-cards.c
>>>>> +++ b/drivers/media/pci/saa7134/saa7134-cards.c
>>>>> @@ -7981,7 +7981,7 @@ int saa7134_board_init2(struct saa7134_dev *dev)
>>>>>                         rc = i2c_transfer(&dev->i2c_adap, &msg, 1);
>>>>>                         pr_info("%s: probe IR chip @ i2c 0x%02x: %s\n",
>>>>>                                    dev->name, msg.addr,
>>>>> -                                  str_yes_no(1 == rc));
>>>>> +                                  str_yes_no(rc == 1));
>>>>>                         if (rc == 1)
>>>>>                                 dev->has_remote = SAA7134_REMOTE_I2C;
>>>>>                 }
>>>>> diff --git a/drivers/media/pci/saa7134/saa7134-input.c b/drivers/media/pci/saa7134/saa7134-input.c
>>>>> index 90837ec6e70f..239f0b9d080a 100644
>>>>> --- a/drivers/media/pci/saa7134/saa7134-input.c
>>>>> +++ b/drivers/media/pci/saa7134/saa7134-input.c
>>>>> @@ -895,7 +895,7 @@ void saa7134_probe_i2c_ir(struct saa7134_dev *dev)
>>>>>                 rc = i2c_transfer(&dev->i2c_adap, &msg_msi, 1);
>>>>>                 input_dbg("probe 0x%02x @ %s: %s\n",
>>>>>                         msg_msi.addr, dev->i2c_adap.name,
>>>>> -                       str_yes_no(1 == rc));
>>>>> +                       str_yes_no(rc == 1));
>>>>>                 break;
>>>>>         case SAA7134_BOARD_SNAZIO_TVPVR_PRO:
>>>>>                 dev->init_data.name = "SnaZio* TVPVR PRO";
>>>>> @@ -931,7 +931,7 @@ void saa7134_probe_i2c_ir(struct saa7134_dev *dev)
>>>>>                 rc = i2c_transfer(&dev->i2c_adap, &msg_msi, 1);
>>>>>                 input_dbg("probe 0x%02x @ %s: %s\n",
>>>>>                         msg_msi.addr, dev->i2c_adap.name,
>>>>> -                       str_yes_no(1 == rc));
>>>>> +                       str_yes_no(rc == 1));
>>>>>                 break;
>>>>>         case SAA7134_BOARD_HAUPPAUGE_HVR1110:
>>>>>                 dev->init_data.name = saa7134_boards[dev->board].name;
>>>>> diff --git a/drivers/media/usb/pvrusb2/pvrusb2-ctrl.c b/drivers/media/usb/pvrusb2/pvrusb2-ctrl.c
>>>>> index 448c40caf363..b6c9bda214c8 100644
>>>>> --- a/drivers/media/usb/pvrusb2/pvrusb2-ctrl.c
>>>>> +++ b/drivers/media/usb/pvrusb2/pvrusb2-ctrl.c
>>>>> @@ -521,7 +521,7 @@ int pvr2_ctrl_value_to_sym_internal(struct pvr2_ctrl *cptr,
>>>>>                 *len = scnprintf(buf,maxlen,"%d",val);
>>>>>                 ret = 0;
>>>>>         } else if (cptr->info->type == pvr2_ctl_bool) {
>>>>> -               *len = scnprintf(buf,maxlen,"%s",str_true_false(val));
>>>>> +               *len = scnprintf(buf, maxlen, "%s", str_true_false(val));
>>>>>                 ret = 0;
>>>>>         } else if (cptr->info->type == pvr2_ctl_enum) {
>>>>>                 const char * const *names;
>>>>> diff --git a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
>>>>> index 96d3a0045fac..761d718478ca 100644
>>>>> --- a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
>>>>> +++ b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
>>>>> @@ -338,7 +338,7 @@ static void trace_stbit(const char *name,int val)
>>>>>  {
>>>>>         pvr2_trace(PVR2_TRACE_STBITS,
>>>>>                    "State bit %s <-- %s",
>>>>> -                  name,str_true_false(val));
>>>>> +                  name, str_true_false(val));
>>>>>  }
>>>>>
>>>>> Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
>>>>> ---
>>>>> Ricardo Ribalda (45):
>>>>>       media: staging: ipu3: Use string_choices helpers
>>>>>       media: staging: atomisp: Use string_choices helpers
>>>>>       media: core: Use string_choices helpers
>>>>>       media: pwc-ctl: Use string_choices helpers
>>>>>       media: pvrusb2:Use string_choices helpers
>>>>>       media: em28xx: Use string_choices helpers
>>>>>       media: dvb-usb: Use string_choices helpers
>>>>>       media: dvb-usb-v2: Use string_choices helpers
>>>>>       media: cx231xx: Use string_choices helpers
>>>>>       media: tuners: Use string_choices helpers
>>>>>       media: rc: Use string_choices helpers
>>>>>       media: dvb-frontends: Use string_choices helpers
>>>>>       media: pci: cx23885: Use string_choices helpers
>>>>>       media: saa7134: Use string_choices helpers
>>>>>       media: amphion: Use string_choices helpers
>>>>>       media: pci: ivtv: Use string_choices helpers
>>>>>       media: bttv: Use string_choices helpers
>>>>>       media: xilinx: Use string_choices helpers
>>>>>       media: platform: ti: Use string_choices helpers
>>>>>       media: st: Use string_choices helpers
>>>>>       media: coda: Use string_choices helpers
>>>>>       media: aspeed: Use string_choices helpers
>>>>>       media: ipu6: Use string_choices helpers
>>>>>       media: cx18: Use string_choices helpers
>>>>>       media: cobalt: Use string_choices helpers
>>>>>       media: videobuf2: Use string_choices helpers
>>>>>       media: cec: Use string_choices helpers
>>>>>       media: b2c2: Use string_choices helpers
>>>>>       media: siano: Use string_choices helpers
>>>>>       media: i2c: cx25840: Use string_choices helpers
>>>>>       media: i2c: vpx3220: Use string_choices helpers
>>>>>       media: i2c: tvp7002: Use string_choices helpers
>>>>>       media: i2c: ths8200: Use string_choices helpers
>>>>>       media: i2c: tda1997x: Use string_choices helpers
>>>>>       media: i2c: tc358743: Use string_choices helpers
>>>>>       media: i2c: st-mipid02: Use string_choices helpers
>>>>>       media: i2c: msp3400: Use string_choices helpers
>>>>>       media: i2c: max9286: Use string_choices helpers
>>>>>       media: i2c: saa717x: Use string_choices helpers
>>>>>       media: i2c: saa7127: Use string_choices helpers
>>>>>       media: i2c: saa7115: Use string_choices helpers
>>>>>       media: i2c: saa7110: Use string_choices helpers
>>>>>       media: i2c: adv7842: Use string_choices helpers
>>>>>       media: i2c: adv76xx: Use string_choices helpers
>>>>>       media: i2c: adv7511: Use string_choices helpers
>>>>>
>>>>>  drivers/media/cec/platform/cec-gpio/cec-gpio.c     |  4 +-
>>>>>  drivers/media/cec/usb/pulse8/pulse8-cec.c          |  4 +-
>>>>>  drivers/media/common/b2c2/flexcop-hw-filter.c      |  4 +-
>>>>>  drivers/media/common/siano/sms-cards.c             |  3 +-
>>>>>  drivers/media/common/videobuf2/videobuf2-core.c    |  5 ++-
>>>>>  drivers/media/dvb-frontends/ascot2e.c              |  2 +-
>>>>>  drivers/media/dvb-frontends/cx24120.c              |  4 +-
>>>>>  drivers/media/dvb-frontends/cxd2841er.c            |  2 +-
>>>>>  drivers/media/dvb-frontends/drxk_hard.c            |  4 +-
>>>>>  drivers/media/dvb-frontends/helene.c               |  2 +-
>>>>>  drivers/media/dvb-frontends/horus3a.c              |  2 +-
>>>>>  drivers/media/dvb-frontends/sp2.c                  |  2 +-
>>>>>  drivers/media/i2c/adv7511-v4l2.c                   | 11 +++---
>>>>>  drivers/media/i2c/adv7604.c                        | 25 ++++++------
>>>>>  drivers/media/i2c/adv7842.c                        | 40 ++++++++++----------
>>>>>  drivers/media/i2c/cx25840/cx25840-core.c           |  4 +-
>>>>>  drivers/media/i2c/cx25840/cx25840-ir.c             | 34 ++++++++---------
>>>>>  drivers/media/i2c/max9286.c                        |  2 +-
>>>>>  drivers/media/i2c/msp3400-driver.c                 |  4 +-
>>>>>  drivers/media/i2c/saa7110.c                        |  2 +-
>>>>>  drivers/media/i2c/saa7115.c                        |  2 +-
>>>>>  drivers/media/i2c/saa7127.c                        | 15 +++++---
>>>>>  drivers/media/i2c/saa717x.c                        |  2 +-
>>>>>  drivers/media/i2c/st-mipid02.c                     |  2 +-
>>>>>  drivers/media/i2c/tc358743.c                       | 44 ++++++++++------------
>>>>>  drivers/media/i2c/tda1997x.c                       |  6 +--
>>>>>  drivers/media/i2c/ths8200.c                        |  4 +-
>>>>>  drivers/media/i2c/tvp7002.c                        |  2 +-
>>>>>  drivers/media/i2c/vpx3220.c                        |  2 +-
>>>>>  drivers/media/pci/bt8xx/bttv-cards.c               | 16 ++++----
>>>>>  drivers/media/pci/bt8xx/bttv-driver.c              |  6 +--
>>>>>  drivers/media/pci/cobalt/cobalt-driver.c           |  2 +-
>>>>>  drivers/media/pci/cx18/cx18-av-core.c              |  4 +-
>>>>>  drivers/media/pci/cx23885/altera-ci.c              |  2 +-
>>>>>  drivers/media/pci/cx23885/cimax2.c                 |  2 +-
>>>>>  drivers/media/pci/cx23885/cx23888-ir.c             | 36 +++++++++---------
>>>>>  drivers/media/pci/intel/ipu6/ipu6-isys-csi2.c      |  2 +-
>>>>>  drivers/media/pci/ivtv/ivtvfb.c                    |  4 +-
>>>>>  drivers/media/pci/saa7134/saa7134-cards.c          |  2 +-
>>>>>  drivers/media/pci/saa7134/saa7134-dvb.c            |  2 +-
>>>>>  drivers/media/pci/saa7134/saa7134-input.c          |  6 +--
>>>>>  drivers/media/pci/saa7134/saa7134-video.c          |  2 +-
>>>>>  drivers/media/platform/amphion/venc.c              |  2 +-
>>>>>  drivers/media/platform/amphion/vpu_dbg.c           |  2 +-
>>>>>  drivers/media/platform/aspeed/aspeed-video.c       |  4 +-
>>>>>  drivers/media/platform/chips-media/coda/imx-vdoa.c |  3 +-
>>>>>  drivers/media/platform/st/sti/hva/hva-debugfs.c    |  6 +--
>>>>>  drivers/media/platform/ti/omap3isp/ispstat.c       |  2 +-
>>>>>  drivers/media/platform/xilinx/xilinx-csi2rxss.c    | 18 ++++-----
>>>>>  drivers/media/rc/ene_ir.c                          |  3 +-
>>>>>  drivers/media/rc/mceusb.c                          |  3 +-
>>>>>  drivers/media/rc/serial_ir.c                       |  5 ++-
>>>>>  drivers/media/tuners/tda18250.c                    |  2 +-
>>>>>  drivers/media/tuners/tda9887.c                     | 10 ++---
>>>>>  drivers/media/usb/cx231xx/cx231xx-i2c.c            |  4 +-
>>>>>  drivers/media/usb/cx231xx/cx231xx-video.c          |  2 +-
>>>>>  drivers/media/usb/dvb-usb-v2/az6007.c              |  4 +-
>>>>>  drivers/media/usb/dvb-usb-v2/dvb_usb_core.c        |  4 +-
>>>>>  drivers/media/usb/dvb-usb/af9005-fe.c              |  4 +-
>>>>>  drivers/media/usb/dvb-usb/dvb-usb-dvb.c            |  6 +--
>>>>>  drivers/media/usb/dvb-usb/opera1.c                 |  8 ++--
>>>>>  drivers/media/usb/em28xx/em28xx-i2c.c              |  4 +-
>>>>>  drivers/media/usb/em28xx/em28xx-video.c            |  2 +-
>>>>>  drivers/media/usb/pvrusb2/pvrusb2-ctrl.c           |  2 +-
>>>>>  drivers/media/usb/pvrusb2/pvrusb2-debugifc.c       |  3 +-
>>>>>  drivers/media/usb/pvrusb2/pvrusb2-encoder.c        |  5 +--
>>>>>  drivers/media/usb/pvrusb2/pvrusb2-hdw.c            |  6 +--
>>>>>  drivers/media/usb/pvrusb2/pvrusb2-i2c-core.c       |  3 +-
>>>>>  drivers/media/usb/pwc/pwc-ctrl.c                   |  2 +-
>>>>>  drivers/media/v4l2-core/v4l2-ctrls-core.c          |  3 +-
>>>>>  drivers/media/v4l2-core/v4l2-fwnode.c              | 12 +++---
>>>>>  .../media/atomisp/pci/atomisp_compat_css20.c       |  2 +-
>>>>>  .../media/atomisp/pci/atomisp_csi2_bridge.c        |  2 +-
>>>>>  .../media/atomisp/pci/atomisp_gmin_platform.c      |  4 +-
>>>>>  drivers/staging/media/atomisp/pci/atomisp_v4l2.c   |  4 +-
>>>>>  .../media/atomisp/pci/runtime/binary/src/binary.c  |  2 +-
>>>>>  drivers/staging/media/atomisp/pci/sh_css.c         |  2 +-
>>>>>  drivers/staging/media/ipu3/ipu3-v4l2.c             |  4 +-
>>>>>  78 files changed, 240 insertions(+), 239 deletions(-)
>>>>> ---
>>>>> base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc
>>>>> change-id: 20240930-cocci-opportunity-40bca6a17c42
>>>>
>>>
>>
>>
>> --
>> Ricardo Ribalda
>>
> 





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