Re: [Xen-devel] [RFC PATCH V4 02/13] netback: add module unload function.

[Eric Dumazet <eric.dumazet@xxxxxxxxx>]

Le vendredi 03 fÃvrier 2012 Ã 06:38 +0000, Ian Campbell a Ãcrit :
> On Thu, 2012-02-02 at 22:52 +0000, Paul Gortmaker wrote:
> > On Thu, Feb 2, 2012 at 3:50 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> 
> > wrote:
> > > On Thu, 2012-02-02 at 20:34 +0000, Eric Dumazet wrote:
> > 
> > [...]
> > 
> > >
> > > I don't think it is at all unreasonable to ask for bug fixes but in this
> > > case Wei's series is removing the code in question (which would also
> > > undoubtedly fix the bug).
> > >
> > > As it happens the fix turns out to be simple but if it were complex I
> > > would perhaps have disagreed more strongly about spending effort fixing
> > > code that is removed 2 patches later, although obviously that would have
> > > depended on the specifics of the fix in that case.
> > 
> > Lots of people are relying on git bisect.  If you introduce build failures
> > or known bugs into any point in history, you take away from the value
> > in git bisect.  Sure, it happens by accident, but it shouldn't ever be
> > done knowingly.
> 
> Sure. In this case the bug has been there since 2.6.39, it isn't
> introduced by this series.
> 

We are stuck right now with a bug introduced in 2.6.39, (IP redirects),
and because fix was done in 3.1, we are unable to provide a fix fo
stable 3.0 kernel.

Something that takes 15 minutes to fix now, can take several days of
work later.




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