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Date: Wed, 9 Sep 2015 14:54:24 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Baoquan He <bhe@redhat.com>, Denys Vlasenko <dvlasenk@redhat.com>,
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Subject: Re: [llvmlinux] percpu | bitmap issue? (Cannot boot on bare metal
 due to a kernel NULL pointer dereference)
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On Wed, Sep 09, 2015 at 12:05:50PM +0200, Sedat Dilek wrote:
> I can boot into a CLANG v3.7 compiled Linux-kernel when lib/bitmap is
> compiled with GCC (here: v4.9).
> 
> CONFIG_OPTIMIZE_INLINING has no effect on this.
> 
> Attached are the single llvmlinux patch for AMD64 (x86_64), my
> kernel-config and 2 objdumps with bitmap.o file alltogether.

I suggest you go tell the LLVM people their compiler is broken.