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Documentation/printk-formats.txt 1.04 KB
b67ad18b0   Randy Dunlap   DOC: add printk-f...
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  If variable is of Type,		use printk format specifier:
  ---------------------------------------------------------
  		int			%d or %x
  		unsigned int		%u or %x
  		long			%ld or %lx
  		unsigned long		%lu or %lx
  		long long		%lld or %llx
  		unsigned long long	%llu or %llx
  		size_t			%zu or %zx
  		ssize_t			%zd or %zx
  
  Raw pointer value SHOULD be printed with %p.
  
  u64 SHOULD be printed with %llu/%llx, (unsigned long long):
  
  	printk("%llu", (unsigned long long)u64_var);
  
  s64 SHOULD be printed with %lld/%llx, (long long):
  
  	printk("%lld", (long long)s64_var);
  
  If <type> is dependent on a config option for its size (e.g., sector_t,
  blkcnt_t, phys_addr_t, resource_size_t) or is architecture-dependent
  for its size (e.g., tcflag_t), use a format specifier of its largest
  possible type and explicitly cast to it.  Example:
  
  	printk("test: sector number/total blocks: %llu/%llu
  ",
  		(unsigned long long)sector, (unsigned long long)blockcount);
  
  Reminder: sizeof() result is of type size_t.
  
  Thank you for your cooperation and attention.
  
  
  By Randy Dunlap <rdunlap@xenotime.net>