Messages in this thread | | | Date | Wed, 29 Oct 2008 08:34:03 -0700 | From | Randy Dunlap <> | Subject | Re: How do I printk <type> correctly? |
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On Wed, 29 Oct 2008 10:00:04 +0200 Artem Bityutskiy wrote:
> On Tue, 2008-10-28 at 16:11 -0700, Randy Dunlap wrote: > > 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 > > > > > > 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. > > Do we have this somewhere in Documentation? Would be nice to have it.
It's in the C standard, which we don't try to put into Documentation/ AFAIK.
section 6.5.3.4, The sizeof operator:
4 The value of the result is implementation-defined, and its type (an unsigned integer type) is size_t, defined in <stddef.h> (and other headers).
--- ~Randy
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