[lkml]   [2008]   [Nov]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: How do I printk <type> correctly?
On Thu, 23 Oct 2008 15:41:33 +0400 Alexey Dobriyan wrote:

> If variable is of Type use printk format specifier.
> ---------------------------------------------------------
> int %d or %x
> unsigned int %u or %x
> long %ld ot %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

Add, or is this one too infrequent to be listed here?

tcflag_t %lu or %lx or %lo

Since tcflag_t is unsigned int (on most $ARCH-es) or unsigned long (on sparc32),
use a cast to (unsigned long)flag when printing it.

[Yes, a sparc32 build gets lots of printk format warnings when printing tcflag_t

> 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 config option (sector_t), use format specifier
> of biggest type and explicitly cast to it.
> Reminder: sizeof() result is of type size_t.
> Thank you for your cooperation.
> --


 \ /
  Last update: 2008-11-05 19:27    [W:0.107 / U:0.140 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site