[PATCH] staging: fbtft: fix macro whitespace errors

[PATCH] staging: fbtft: fix macro whitespace errors

[dhyan19022009]

From: Dhyan K Prajapati <dhyan19022009@gmail.com>

Remove prohibited spaces before closing parentheses in macro calls in
fbtft-bus.c, reported by checkpatch.pl

Signed-off-by: Dhyan K Prajapati <dhyan19022009@gmail.com>
---
 drivers/staging/fbtft/fbtft-bus.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/fbtft/fbtft-bus.c b/drivers/staging/fbtft/fbtft-bus.c
index 30e436ff1..409770891 100644
--- a/drivers/staging/fbtft/fbtft-bus.c
+++ b/drivers/staging/fbtft/fbtft-bus.c
@@ -62,9 +62,9 @@ out:									      \
 }                                                                             \
 EXPORT_SYMBOL(func);
 
-define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8, )
+define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8)
 define_fbtft_write_reg(fbtft_write_reg16_bus8, __be16, u16, cpu_to_be16)
-define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, u16, )
+define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, u16)
 
 void fbtft_write_reg8_bus9(struct fbtft_par *par, int len, ...)
 {
-- 
2.53.0

Re: [PATCH] staging: fbtft: fix macro whitespace errors

[Andy Shevchenko]

On Thu, Feb 26, 2026 at 10:55:31PM +0530, dhyan19022009@gmail.com wrote:
> 
> Remove prohibited spaces before closing parentheses in macro calls in
> fbtft-bus.c, reported by checkpatch.pl

You haven't compiled this, have you?


-- 
With Best Regards,
Andy Shevchenko

Claude review: Re: [PATCH] staging: fbtft: fix macro whitespace errors

[Claude Code Review Bot]

Patch Review

**Result: NAK — breaks compilation**

The macro `define_fbtft_write_reg` is defined with exactly 4 parameters (line 14 of `fbtft-bus.c`):

```c
#define define_fbtft_write_reg(func, buffer_type, data_type, modifier)
```

The `modifier` parameter is used throughout the macro body as a function-like call, for example:

```c
buf[i] = modifier((data_type)va_arg(args, unsigned int));
```

When `modifier` is passed as empty (e.g., `define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8, )`), the expansion becomes simply `((u8)va_arg(args, unsigned int))` — an identity operation. This is intentional: `fbtft_write_reg8_bus8` needs no byte-order conversion, while `fbtft_write_reg16_bus8` passes `cpu_to_be16` as the modifier.

The patch changes:
```c
-define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8, )
+define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8)
```

This reduces the argument count from 4 to 3, which will produce a compilation error like:
```
error: macro "define_fbtft_write_reg" requires 4 arguments, but only 3 given
```

The same issue applies to the second hunk:
```c
-define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, u16, )
+define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, u16)
```

The checkpatch.pl warning about "space before closing parenthesis" is a **false positive** in this context. The trailing `, )` is the C preprocessor's way of passing an empty argument to a macro — it is not a style issue.

**If the goal is to silence the checkpatch warning**, the correct approach would be to refactor the macro to use variadic arguments (`__VA_ARGS__`) or to define a no-op identity macro (e.g., `#define FBTFT_IDENTITY(x) (x)`) and pass that instead of an empty argument. Simply deleting the argument is not valid.

---
Generated by Claude Code Patch Reviewer

Claude review: Re: [PATCH] staging: fbtft: fix macro whitespace errors

[Claude Code Review Bot]

Overall Series Review

Subject: Re: [PATCH] staging: fbtft: fix macro whitespace errors
Author: Andy Shevchenko <andriy.shevchenko@intel.com>
Patches: 4
Reviewed: 2026-02-27T11:42:54.570254

---

**NAK — This patch is incorrect and will break compilation.**

This is a single patch that claims to fix "macro whitespace errors" reported by checkpatch.pl in the staging fbtft driver. However, the patch fundamentally misunderstands the code: what appears to be trailing whitespace before the closing parenthesis is actually an **intentionally empty macro argument**. Removing it changes a 4-argument macro invocation into a 3-argument one, which will cause a preprocessor error.

---
Generated by Claude Code Patch Reviewer

Re: [PATCH] staging: fbtft: fix macro whitespace errors

[kernel test robot]

Hi,

kernel test robot noticed the following build errors:

[auto build test ERROR on staging/staging-testing]

url:    https://github.com/intel-lab-lkp/linux/commits/dhyan19022009-gmail-com/staging-fbtft-fix-macro-whitespace-errors/20260227-021646
base:   staging/staging-testing
patch link:    https://lore.kernel.org/r/20260226172531.13714-1-dhyan19022009%40gmail.com
patch subject: [PATCH] staging: fbtft: fix macro whitespace errors
config: parisc-randconfig-001-20260227 (https://download.01.org/0day-ci/archive/20260227/202602270527.UlXqo4xH-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260227/202602270527.UlXqo4xH-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602270527.UlXqo4xH-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/staging/fbtft/fbtft-bus.c:65:53: error: macro "define_fbtft_write_reg" requires 4 arguments, but only 3 given
    define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8)
                                                        ^
>> drivers/staging/fbtft/fbtft-bus.c:65:23: error: expected ';' before 'void'
    define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8)
                          ^
                          ;
   drivers/staging/fbtft/fbtft-bus.c:67:57: error: macro "define_fbtft_write_reg" requires 4 arguments, but only 3 given
    define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, u16)
                                                            ^
   drivers/staging/fbtft/fbtft-bus.c:67:23: error: expected ';' before 'void'
    define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, u16)
                          ^
                          ;
   drivers/staging/fbtft/fbtft-bus.c:69:1:
    void fbtft_write_reg8_bus9(struct fbtft_par *par, int len, ...)
    ~~~~                   


vim +/define_fbtft_write_reg +65 drivers/staging/fbtft/fbtft-bus.c

    64	
  > 65	define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8)
    66	define_fbtft_write_reg(fbtft_write_reg16_bus8, __be16, u16, cpu_to_be16)
    67	define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, u16)
    68	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [PATCH] staging: fbtft: fix macro whitespace errors

[kernel test robot]

Hi,

kernel test robot noticed the following build errors:

[auto build test ERROR on staging/staging-testing]

url:    https://github.com/intel-lab-lkp/linux/commits/dhyan19022009-gmail-com/staging-fbtft-fix-macro-whitespace-errors/20260227-021646
base:   staging/staging-testing
patch link:    https://lore.kernel.org/r/20260226172531.13714-1-dhyan19022009%40gmail.com
patch subject: [PATCH] staging: fbtft: fix macro whitespace errors
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20260227/202602270720.2J4j3gHF-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260227/202602270720.2J4j3gHF-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602270720.2J4j3gHF-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/staging/fbtft/fbtft-bus.c:65:53: error: too few arguments provided to function-like macro invocation
      65 | define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8)
         |                                                     ^
   drivers/staging/fbtft/fbtft-bus.c:14:9: note: macro 'define_fbtft_write_reg' defined here
      14 | #define define_fbtft_write_reg(func, buffer_type, data_type, modifier)        \
         |         ^
>> drivers/staging/fbtft/fbtft-bus.c:65:1: error: unknown type name 'define_fbtft_write_reg'
      65 | define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8)
         | ^
   drivers/staging/fbtft/fbtft-bus.c:67:57: error: too few arguments provided to function-like macro invocation
      67 | define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, u16)
         |                                                         ^
   drivers/staging/fbtft/fbtft-bus.c:14:9: note: macro 'define_fbtft_write_reg' defined here
      14 | #define define_fbtft_write_reg(func, buffer_type, data_type, modifier)        \
         |         ^
   drivers/staging/fbtft/fbtft-bus.c:67:1: error: unknown type name 'define_fbtft_write_reg'
      67 | define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, u16)
         | ^
   4 errors generated.


vim +65 drivers/staging/fbtft/fbtft-bus.c

    64	
  > 65	define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8)
    66	define_fbtft_write_reg(fbtft_write_reg16_bus8, __be16, u16, cpu_to_be16)
    67	define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, u16)
    68	

-- 
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https://github.com/intel/lkp-tests/wiki