Re: + kernelh-printk-panic-string-cleanup.patch added to -mm tree

[Frederic Weisbecker]

On Wed, Feb 24, 2010 at 01:07:15PM -0800, akpm@xxxxxxxxxxxxxxxxxxxx wrote:
> 
> The patch titled
>      kernel.h: printk/panic/string cleanup
> has been added to the -mm tree.  Its filename is
>      kernelh-printk-panic-string-cleanup.patch
> 
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> 
> *** Remember to use Documentation/SubmitChecklist when testing your code ***
> 
> See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
> out what to do about this
> 
> The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/



Andrew, please don't merge this patch.

I'm not against the idea kernel.h gets split up a bit, by having
a prink.h and panic.h included from kernel.h for example.

But this patch breaks bisection: some tracing general helpers are
removed here but re-integrated in a different header only in a subsequent
patch in the series. This should be done in the same patch, otherwise it
breaks the build in the middle of the set.

The other problem, as Steve noticed, is that the tracing prototypes are
moved in ring_buffer.h (in the subsequent patch), which is not the right
place as the ring buffer is not only for tracing purpose. And also
it moves functions out of kernel.h while these are really useful for
general purposes.

That said, it's probably sane to think about a new header to put
these tracing prototypes, if it's included by kernel.h,
linux/ftrace.h is already filled with non-general purpose things.
So may be linux/trace.h ? Yeah this could be confusing, Steve what
do you think?

And all in one, it would probably better to split this in three
patches: one that moves printk helpers out of kernel.h to printk.h,
another following the same pattern for panic things and another one
for tracing things.

Thanks.

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