Am Freitag, 7. März 2014, 20:17:56 schrieb Greg KH:
> On Fri, Mar 07, 2014 at 11:38:03AM +0300, Dan Carpenter wrote:
> > drivers/staging/unisys/include/guidutils.h
> >
> > 57 static inline char *
> > 58 GUID_format2(const GUID *guid, char *s)
> > 59 {
> > 60 sprintf(s,
> > "{%-8.8lx-%-4.4x-%-4.4x-%-2.2x%-2.2x-%-2.2x%-2.2x%-2.2x%-2.2x%-2.2x%
> > -2.2x}", 61 (ulong) guid->data1,
> > 62 guid->data2,
> > 63 guid->data3,
> > 64 guid->data4[0],
> > 65 guid->data4[1],
> > 66 guid->data4[2],
> > 67 guid->data4[3],
> > 68 guid->data4[4], guid->data4[5], guid->data4[6],
> > guid->data4[7]); 69 return s;
> > 70 }
> >
> > The 50 character buf size comes from the CHANNEL_GUID_MISMATCH() macros.
> > I'm not sure how it's calculating that it takes 63 characters. printf
> > formats make my head hurt. My test said the max was 95 characters?
>
> There should be a built-in guid printk() macro (or function to do it)
> already in the kernel, so this code should be able to just be deleted
> entirely.
Yes there is
UUID/GUID addresses:
%pUb 00010203-0405-0607-0809-0a0b0c0d0e0f
%pUB 00010203-0405-0607-0809-0A0B0C0D0E0F
%pUl 03020100-0504-0706-0809-0a0b0c0e0e0f
%pUL 03020100-0504-0706-0809-0A0B0C0E0E0F
For printing 16-byte UUID/GUIDs addresses. The additional 'l', 'L',
'b' and 'B' specifiers are used to specify a little endian order in
lower ('l') or upper case ('L') hex characters - and big endian order
in lower ('b') or upper case ('B') hex characters.
Where no additional specifiers are used the default little endian
order with lower case hex characters will be printed.
From
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/printk-formats.txt?id=HEAD#n163
PeterH
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