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Re: [Xen-devel] [PATCH v6 14/27] x86/percpu: Adapt percpu for PIE support
- To: Thomas Garnier <thgarnie@xxxxxxxxxxxx>
- From: Christopher Lameter <cl@xxxxxxxxx>
- Date: Fri, 1 Feb 2019 02:31:36 +0000
- 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>
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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.
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