linux-kernel - Re: [RFC][PATCH v3 1/5] sparc64: Fix asm/percpu.h build error

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Message-ID: <20200604204116.GD4496@worktop.programming.kicks-ass.net>
Date:   Thu, 4 Jun 2020 22:41:16 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     David Miller <davem@...emloft.net>
Cc:     mingo@...nel.org, will@...nel.org, tglx@...utronix.de,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        a.darwish@...utronix.de, rostedt@...dmis.org,
        bigeasy@...utronix.de, sparclinux@...r.kernel.org,
        mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org,
        heiko.carstens@...ibm.com, linux-s390@...r.kernel.org
Subject: Re: [RFC][PATCH v3 1/5] sparc64: Fix asm/percpu.h build error

On Thu, Jun 04, 2020 at 06:57:03PM +0200, Peter Zijlstra wrote:

> I think I see, what happens is that these headers end up in the VDSO
> build, and that doesn't have these CFLAGS, because userspace.
> 
> Let me see what to do about that.

I feel like the below is cheating, but it's the best I could find :/
VDSO including kernel headers and the utter maze that our kernel headers
are makes it really hard to untangle :/

This builds sparc64-defconfig and sparc64-all{no,mod}config.

Dave, does this work for you, or should I try hardder?

---
 arch/sparc/include/asm/percpu_64.h  | 2 ++
 arch/sparc/include/asm/trap_block.h | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/arch/sparc/include/asm/percpu_64.h b/arch/sparc/include/asm/percpu_64.h
index 32ef6f05cc565..a8786a4b90b6b 100644
--- a/arch/sparc/include/asm/percpu_64.h
+++ b/arch/sparc/include/asm/percpu_64.h
@@ -4,7 +4,9 @@

 #include <linux/compiler.h>

+#ifndef BUILD_VDSO
 register unsigned long __local_per_cpu_offset asm("g5");
+#endif

 #ifdef CONFIG_SMP

diff --git a/arch/sparc/include/asm/trap_block.h b/arch/sparc/include/asm/trap_block.h
index 0f6d0c4f66838..ace0d48e837e5 100644
--- a/arch/sparc/include/asm/trap_block.h
+++ b/arch/sparc/include/asm/trap_block.h
@@ -2,6 +2,8 @@
 #ifndef _SPARC_TRAP_BLOCK_H
 #define _SPARC_TRAP_BLOCK_H

+#include <linux/threads.h>
+
 #include <asm/hypervisor.h>
 #include <asm/asi.h>