commit 45cd8d8e -- why?

commit 45cd8d8e -- why?

[Roland Dreier]

The changelog says:

    fs/sysfs/bin.c: In function 'read':
    fs/sysfs/bin.c:77: warning: format '%zd' expects type 'signed size_t', but argument 4 has type 'int'

but the signature of the function read() is

    read(struct file * file, char __user * userbuf, size_t count, loff_t * off)

and git blame seems to show it was always thus -- ie count was always size_t.

And now on x86-64 and ia64 with gcc 4.1 at least, I get:

    fs/sysfs/bin.c: In function 'read':
    fs/sysfs/bin.c:62: warning: format '%d' expects type 'int', but argument 4 has type 'size_t'

Andrew, what compiler were you using to get that warning?  Should we
revert commit 45cd8d8e?

 - R.

Re: commit 45cd8d8e -- why?

[Andrew Morton]

On Fri, 27 Apr 2007 19:50:19 -0700 Roland Dreier <rdreier@cisco.com> wrote:

> The changelog says:
> 
>     fs/sysfs/bin.c: In function 'read':
>     fs/sysfs/bin.c:77: warning: format '%zd' expects type 'signed size_t', but argument 4 has type 'int'
> 
> but the signature of the function read() is
> 
>     read(struct file * file, char __user * userbuf, size_t count, loff_t * off)
> 
> and git blame seems to show it was always thus -- ie count was always size_t.
> 
> And now on x86-64 and ia64 with gcc 4.1 at least, I get:
> 
>     fs/sysfs/bin.c: In function 'read':
>     fs/sysfs/bin.c:62: warning: format '%d' expects type 'int', but argument 4 has type 'size_t'

Some patches landed out of order.  In Greg's tree (with Tejun's patches)
`count' is a local variable (not an incoming arg) of type `int'.

So this patch was against Tejun's stuff, not against mainline.

I'd have picked that up, but I went and assumed that it was a victim of the
new dev_dbg() printk arg checking stuff.  Ho hum.

Re: commit 45cd8d8e -- why?

[Tejun Heo]

Andrew Morton wrote:
> On Fri, 27 Apr 2007 19:50:19 -0700 Roland Dreier <rdreier@cisco.com> wrote:
> 
>> The changelog says:
>>
>>     fs/sysfs/bin.c: In function 'read':
>>     fs/sysfs/bin.c:77: warning: format '%zd' expects type 'signed size_t', but argument 4 has type 'int'
>>
>> but the signature of the function read() is
>>
>>     read(struct file * file, char __user * userbuf, size_t count, loff_t * off)
>>
>> and git blame seems to show it was always thus -- ie count was always size_t.
>>
>> And now on x86-64 and ia64 with gcc 4.1 at least, I get:
>>
>>     fs/sysfs/bin.c: In function 'read':
>>     fs/sysfs/bin.c:62: warning: format '%d' expects type 'int', but argument 4 has type 'size_t'
> 
> Some patches landed out of order.  In Greg's tree (with Tejun's patches)
> `count' is a local variable (not an incoming arg) of type `int'.
> 
> So this patch was against Tejun's stuff, not against mainline.
> 
> I'd have picked that up, but I went and assumed that it was a victim of the
> new dev_dbg() printk arg checking stuff.  Ho hum.

Ah.. I already have this fix merged in my patch series.  I'm currently
testing things, so please be patient a little bit more.  Thanks.

-- 
tejun