On 02/16/2017 08:42 AM, Dave Hansen wrote:
> On 02/15/2017 12:31 PM, Dave Jiang wrote:
>> The fix introduced by e4decc90 to fix the UP case for 32bit x86, however
>> that broke the SMP case that was working previously. Add ifdef so the dummy
>> function only show up for 32bit UP case only.
> 
> Could you elaborate a bit on how it broke things?

So originally 0-day build found that commit a10a1701 (mm, x86: add
support for PUD-sized transparent hugepages) is breaking 32bit x86 UP
config because native_pud_clear() was missing to satisfy
arch/x86/include/asm/pgtable.h. I added a dummy function to satisfy that
with commit e4decc90 (mm,x86: native_pud_clear missing on i386 build).
However in the process of doing that, I broke the 32bit x86 SMP config
that was working before.

> 
>> Fix: e4decc90 mm,x86: native_pud_clear missing on i386 build
> 
> Which tree is that in, btw?
> 
linux-next-20170214 I believe
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