On Wed, Apr 19, 2006 at 04:25:58PM -0700, Ram Pai wrote:
> On Tue, 2006-04-18 at 16:09 +0200, Adrian Bunk wrote:
> > On Thu, Apr 13, 2006 at 05:38:26AM -0700, Ram Pai wrote:
> >
> > > I ran a report to extract export-symbol usage by kernel modules. The results
> > > are at http://www.sudhaa.com/~ram/misc/export_report.txt
> > >
> > > The report lists:
> > > 1. All the exported symbols and their usage counts by in-kernel modules.
> > > 2. for each in-kernel module, lists the modules and the exported symbols
> > > from those modules, that it depends on.
> > >
> > > Highlights:
> > > On x86 architecture
> > > (1) 880 exported symbols not used by any in-kernel modules.
> > > (2) 1792 exported symbols used only once.
> > >
> > > I hope this report/tool shall help all inkernel modules to revisit their usage
> > > of kernel interfaces.
> > >
> > > This patch integrates the report-generator into the kernel build process. After
> > > applying this patch, invoke 'make export_report' and it creates the report in
> > > Documentation/export_report.txt
> > >...
> >
> > I like your patch, but I have observed two issues:
> > - please don't force an allmodconfig, simply use the currently compiled
> > kernel
>
> Looking for ideas. Its hard to extract out the imported symbols unless
> they are compiled as modules. Running the report on a currently compiled
> kernel will miss most of the subsystems that are not compile as modules.
> Hence the report wont be complete. Any suggestions?
>...
- it's a tool for kernel hackers who know what they are doing
- it's a tool to help you finding unused exports, but each one still
requires manual verification
Besides this, e.g. CONFIG_SMP=n brings you more modules and therefore a
better coverage than allmodconfig.
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
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