Re: [PATCH] tools: Fix math.h breakage

[Andy Shevchenko]

On Tue, Nov 30, 2021 at 03:07:12PM +0000, Matthew Wilcox wrote:
> On Tue, Nov 30, 2021 at 04:39:00PM +0200, Andy Shevchenko wrote:
> > On Tue, Nov 30, 2021 at 02:13:16PM +0000, Matthew Wilcox (Oracle) wrote:
> > > Commit 98e1385ef24b broke the radix tree test suite in two different ways;
> > > first by including math.h which didn't exist in the tools directory, and
> > > second by removing an implicit include of spinlock.h before lockdep.h.
> > > Fix both issues.
> > 
> > Sorry for that and thank you for the fix.
> > Acked-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> > 
> > I'm wondering if there is a way of not copying kernel headers manually,
> > otherwise we always will have such breakages.
> 
> It's not necessarily that these are _copies_ of kernel headers, so much as
> they're ways of mocking kernel interfaces when building userspace code.
> We could separate out pieces and include them from each direction, but
> that has its own problems, and doesn't necessarily solve these kinds of
> problems either.
> 
> I think the only way to prevent these kinds of breakages is to make sure
> the build bots are also building things.

I don't know how to achieve this locally because I'm using `make O=...` and
it's broken for many tools/ folders. At some point I simply gave up.

-- 
With Best Regards,
Andy Shevchenko