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Re: [Xen-devel] [PATCH v6 14/27] x86/percpu: Adapt percpu for PIE support
- To: Christopher Lameter <cl@xxxxxxxxx>
- From: Thomas Garnier <thgarnie@xxxxxxxxxxxx>
- Date: Fri, 1 Feb 2019 09:13:58 -0800
- Cc: Michal Hocko <mhocko@xxxxxxxx>, Brijesh Singh <brijesh.singh@xxxxxxx>, Kernel Hardening <kernel-hardening@xxxxxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>, kristen@xxxxxxxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Dennis Zhou <dennis@xxxxxxxxxx>, Joerg Roedel <jroedel@xxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Cao jin <caoj.fnst@xxxxxxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Andi Kleen <ak@xxxxxxxxxxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
- Delivery-date: Fri, 01 Feb 2019 17:14:17 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Thu, Jan 31, 2019 at 6:31 PM Christopher Lameter <cl@xxxxxxxxx> wrote:
>
> On Thu, 31 Jan 2019, Thomas Garnier wrote:
>
> > The per-cpu symbols are in a section that is zero based to create
> > offsets. The compiler doesn't see them as offsets but as relative
> > symbol and try to relocate them. Given the distance between zero and
> > the mapped kernel is much larger than the instruction offset range, it
> > fails to do it.
>
> We switch that off in the linker. If that does not work with your
> modifications then you need to figure out how to update the link
> configuration.
>
It didn't work originally but I will revisit to see if I missed something.
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