linux-kernel - [jlayton:iversion 16/17] include/linux/kern_levels.h:5:25: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'ssize

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Date:   Thu, 6 Oct 2022 09:27:19 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [jlayton:iversion 16/17] include/linux/kern_levels.h:5:25: warning:
 format '%ld' expects argument of type 'long int', but argument 2 has type
 'ssize_t' {aka 'int'}

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git iversion
head:   dd6d62518f85963515225826455d92be6671f7d6
commit: 2f8fed671d1dbbe1b61a2a223b516d716c39ecdc [16/17] vfs: update version after copying data in __generic_file_write_iter
config: um-i386_defconfig
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git/commit/?id=2f8fed671d1dbbe1b61a2a223b516d716c39ecdc
        git remote add jlayton https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git
        git fetch --no-tags jlayton iversion
        git checkout 2f8fed671d1dbbe1b61a2a223b516d716c39ecdc
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   In file included from include/asm-generic/bug.h:22,
                    from ./arch/um/include/generated/asm/bug.h:1,
                    from include/linux/bug.h:5,
                    from include/linux/thread_info.h:13,
                    from include/asm-generic/preempt.h:5,
                    from ./arch/um/include/generated/asm/preempt.h:1,
                    from include/linux/preempt.h:78,
                    from include/linux/spinlock.h:55,
                    from include/linux/wait.h:9,
                    from include/linux/wait_bit.h:8,
                    from include/linux/fs.h:6,
                    from include/linux/dax.h:5,
                    from mm/filemap.c:15:
   mm/filemap.c: In function '__generic_file_write_iter':
>> include/linux/kern_levels.h:5:25: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'ssize_t' {aka 'int'} [-Wformat=]
       5 | #define KERN_SOH        "\001"          /* ASCII Start Of Header */
         |                         ^~~~~~
   include/linux/printk.h:436:25: note: in definition of macro 'printk_index_wrap'
     436 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                         ^~~~
   include/linux/once_lite.h:31:25: note: in expansion of macro 'printk'
      31 |                         func(__VA_ARGS__);                              \
         |                         ^~~~
   include/linux/once_lite.h:11:9: note: in expansion of macro 'DO_ONCE_LITE_IF'
      11 |         DO_ONCE_LITE_IF(true, func, ##__VA_ARGS__)
         |         ^~~~~~~~~~~~~~~
   include/linux/printk.h:603:9: note: in expansion of macro 'DO_ONCE_LITE'
     603 |         DO_ONCE_LITE(printk, fmt, ##__VA_ARGS__)
         |         ^~~~~~~~~~~~
   include/linux/printk.h:622:9: note: in expansion of macro 'printk_once'
     622 |         printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
         |         ^~~~~~~~~~~
   include/linux/kern_levels.h:12:25: note: in expansion of macro 'KERN_SOH'
      12 | #define KERN_WARNING    KERN_SOH "4"    /* warning conditions */
         |                         ^~~~~~~~
   include/linux/printk.h:622:21: note: in expansion of macro 'KERN_WARNING'
     622 |         printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
         |                     ^~~~~~~~~~~~
   mm/filemap.c:3883:25: note: in expansion of macro 'pr_warn_once'
    3883 |                         pr_warn_once("vfs: failed to update i_version after write: %ld\n",
         |                         ^~~~~~~~~~~~


vim +5 include/linux/kern_levels.h

314ba3520e513a7 Joe Perches 2012-07-30  4  
04d2c8c83d0e3ac Joe Perches 2012-07-30 @5  #define KERN_SOH	"\001"		/* ASCII Start Of Header */
04d2c8c83d0e3ac Joe Perches 2012-07-30  6  #define KERN_SOH_ASCII	'\001'
04d2c8c83d0e3ac Joe Perches 2012-07-30  7  

:::::: The code at line 5 was first introduced by commit
:::::: 04d2c8c83d0e3ac5f78aeede51babb3236200112 printk: convert the format for KERN_<LEVEL> to a 2 byte pattern

:::::: TO: Joe Perches <joe@...ches.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

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