Re: [PATCH 2/2] jump label: disable due to compiler bug

[David Daney]

On 10/29/2010 10:33 AM, Steven Rostedt wrote:
> On Fri, 2010-10-29 at 10:18 -0700, David Daney wrote:
>
> > I hate to continue beating a dead horse, but RTH just committed the GCC
> > patch, and it will be part of GCC-4.5.2 and later.
>
> Great!
>
> > Should this knowledge be builtin to the jump label enabling calculus?
>
> No, because we can't trust versions. We never know what home grown gcc a
> kernel developer is using (and what has been backported or not). Thus
> the only option is to have a builtin test we can do at compile time to
> determine if the bug exists or not and decide then.

The test case is in the GCC bug report, and is quite small:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46226

Perhaps it could be integrated with the current checks for the presence 
of 'asm goto'

> Note, I'm currently running my last set of patches through ktest. When
> it finishes (presumably with no issues), I'll post a pull request.
>
> -- Steve

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