linux-kernel - Re: New bcache compiler warning (was: Re: bcache: Minor fixes from kbuild robot)

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Date:	Mon, 17 Feb 2014 13:06:52 -0800
From:	Randy Dunlap <rdunlap@...radead.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Kent Overstreet <kmo@...erainc.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-bcache@...r.kernel.org
Subject: Re: New bcache compiler warning (was: Re: bcache: Minor fixes from
 kbuild robot)

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@...r.kernel.org> 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).

-- 
~Randy
--
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