On Mon, Feb 17, 2014 at 10:06 PM, Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote:
> On 02/17/2014 01:00 PM, Geert Uytterhoeven wrote:
>> On Fri, Feb 14, 2014 at 8:04 PM, Linux Kernel Mailing List
>> <linux-kernel@xxxxxxxxxxxxxxx> wrote:
>>> bcache: Minor fixes from kbuild robot
>>
>>> diff --git a/drivers/md/bcache/bset.c b/drivers/md/bcache/bset.c
>>> index 4f6b594..3f74b4b 100644
>>> --- a/drivers/md/bcache/bset.c
>>> +++ b/drivers/md/bcache/bset.c
>>> @@ -23,7 +23,7 @@ void bch_dump_bset(struct btree_keys *b, struct bset *i, unsigned set)
>>> for (k = i->start; k < bset_bkey_last(i); k = next) {
>>> next = bkey_next(k);
>>>
>>> - printk(KERN_ERR "block %u key %zi/%u: ", set,
>>> + printk(KERN_ERR "block %u key %li/%u: ", set,
>>> (uint64_t *) k - i->d, i->keys);
>>>
>>> if (b->ops->key_dump)
>>
>> On 32-bit (m68k):
>> drivers/md/bcache/bset.c: In function ‘bch_dump_bset’:
>> drivers/md/bcache/bset.c:27: warning: format ‘%li’ expects type ‘long
>> int’, but argument 3 has type ‘int’
>>
>> What are you trying to print here? It looks a bit strange to me.
>> Technically, the difference between two pointers is of type ptrdiff_.
>> The kernel had
>>
>> typedef __kernel_ptrdiff_t ptrdiff_t;
>>
>> and
>>
>> #if __BITS_PER_LONG != 64
>> typedef unsigned int __kernel_size_t;
>> typedef int __kernel_ssize_t;
>> typedef int __kernel_ptrdiff_t;
>> #else
>> typedef __kernel_ulong_t __kernel_size_t;
>> typedef __kernel_long_t __kernel_ssize_t;
>> typedef __kernel_long_t __kernel_ptrdiff_t;
>> #endif
>>
>> So I'd expect "%zi" to be the right way, and a quick test compile on
>> 32-bit (m68k)
>> and 64-bit (amd64) comfirms that. What was wrong with it?
>
> The kernel supports 't' (%t) for ptrdiff_t (same as glibc),
> so %ti should work (or %tu).
Yes, that compiles without warnings, too.
And after more decyphering, "(uint64_t *) k - i->d" seems to be positive,
so "%tu" should be OK.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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