linux-kernel - Re: [llvmlinux] percpu | bitmap issue? (Cannot boot on bare metal due to a kernel NULL pointer dereference)

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Date:	Wed, 9 Sep 2015 12:05:50 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Baoquan He <bhe@...hat.com>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>, Tejun Heo <tj@...nel.org>,
	Christoph Lameter <cl@...ux.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Thomas Graf <tgraf@...g.ch>, Ingo Molnar <mingo@...nel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: [llvmlinux] percpu | bitmap issue? (Cannot boot on bare metal due
 to a kernel NULL pointer dereference)

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.

[ objdumps ]

$ objdump -drw bitmap.o

$ objdump -D -Mintel bitmap.o

Thanks to all involved people (including not-CCed folks from LLVMLinux project).

If I can help, please poke me.

- Sedat -

View attachment "4.2.0-2-llvmlinux-small.patch" of type "text/x-patch" (34830 bytes)

Download attachment "config-4.2.0-2-llvmlinux-small" of type "application/octet-stream" (128613 bytes)

Download attachment "CLANG-3-7_objdumps.tar.gz" of type "application/x-gzip" (46540 bytes)

Download attachment "GCC-4-7_objdumps.tar.gz" of type "application/x-gzip" (37867 bytes)