Re: [RFC PATCH printk v1] printk: ringbuffer: Do not skip non-finalized with prb_next_seq()

[kernel test robot <lkp@intel.com>]

Hi John,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on a26f18f291f6c2eac6dac9faa12cc68fd1da5865]

url:    https://github.com/intel-lab-lkp/linux/commits/John-Ogness/printk-ringbuffer-Do-not-skip-non-finalized-with-prb_next_seq/20231019-213147
base:   a26f18f291f6c2eac6dac9faa12cc68fd1da5865
patch link:    https://lore.kernel.org/r/20231019132545.1190490-1-john.ogness%40linutronix.de
patch subject: [RFC PATCH printk v1] printk: ringbuffer: Do not skip non-finalized with prb_next_seq()
config: sh-allnoconfig (https://download.01.org/0day-ci/archive/20231022/202310220840.5Roikkvq-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231022/202310220840.5Roikkvq-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/202310220840.5Roikkvq-lkp@intel.com/

All errors (new ones prefixed by >>):

   kernel/printk/printk_ringbuffer.c: In function '__ulseq_to_u64seq':
>> kernel/printk/printk_ringbuffer.c:1456:42: error: 'prb' undeclared (first use in this function)
    1456 |         u64 rb_first_seq = prb_first_seq(prb);
         |                                          ^~~
   kernel/printk/printk_ringbuffer.c:1456:42: note: each undeclared identifier is reported only once for each function it appears in


vim +/prb +1456 kernel/printk/printk_ringbuffer.c

  1452	
  1453	#define __u64seq_to_ulseq(u64seq) ((u32)u64seq)
  1454	static inline u64 __ulseq_to_u64seq(u32 ulseq)
  1455	{
> 1456		u64 rb_first_seq = prb_first_seq(prb);
  1457		u64 seq;
  1458	
  1459		/*
  1460		 * The provided sequence is only the lower 32 bits of the ringbuffer
  1461		 * sequence. It needs to be expanded to 64bit. Get the first sequence
  1462		 * number from the ringbuffer and fold it.
  1463		 */
  1464		seq = rb_first_seq - ((u32)rb_first_seq - ulseq);
  1465	
  1466		return seq;
  1467	}
  1468	

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