Kernel symbol version history

Grant Likely grant.likely at
Thu Dec 6 03:49:35 EST 2007

On 12/5/07, David H. Lynch Jr. <dhlii at> wrote:
>     This might be slightly OT here, but would anyone know where there
> might be a reference that indicates at precisely what version a given
> symbol either appeared or disappeared within the  Linux kernel ?
>      As an example if a driver is supposed to work for 2.6 and 2.4 and
> uses sysfs, or cdev, or alloc_chr_dev_region or ...
>     How can one tell at what point that api or symbol appeared so that
> the proper conditionals appear within the driver.

the 'gitk' tool allows you to search for the addition or removal of a
string.  You

>     The last one that bit me was I made a collection of casting changes
> to address 64bit vs. 32bit targets, and found that using the C99 fixed
> size types - uint32_t, ... made life much more pleasant, after putting
> them I nobody else could build because uintptr_t did not appear until
> 2.6.24, and I still have not figured out exactly when uint32_t etc.
> appeared.
>     I would think there ought to be some resource besides group memory
> to look this up ?
>     Is there a way to use git to look back through the history of a
> symbol rather than a file.

grant at trillian:~/hacking/linux-2.6$ grep "uint32_t" include/* -r | grep typedef
include/linux/types.h:typedef           __u32           uint32_t;
grant at trillian:~/hacking/linux-2.6$ git log -p include/linux/types.h | vim -
(Search for the string uint32_t)

Looks like it was there before Linus started using git.

> --
> Dave Lynch                                                  DLA Systems
> Software Development:                                    Embedded Linux
> 717.627.3770           dhlii at 
> fax: 1.253.369.9244                                Cell: 1.717.587.7774
> Over 25 years' experience in platforms, languages, and technologies too numerous to list.
> "Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction."
> Albert Einstein
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Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
grant.likely at
(403) 399-0195

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