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

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Message-ID: <20200529214203.673108357@infradead.org>
Date:   Fri, 29 May 2020 23:35:51 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     mingo@...nel.org, will@...nel.org, tglx@...utronix.de
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        a.darwish@...utronix.de, rostedt@...dmis.org,
        bigeasy@...utronix.de, peterz@...radead.org, davem@...emloft.net,
        sparclinux@...r.kernel.org, mpe@...erman.id.au,
        linuxppc-dev@...ts.ozlabs.org, heiko.carstens@...ibm.com,
        linux-s390@...r.kernel.org
Subject: [RFC][PATCH v3 1/5] sparc64: Fix asm/percpu.h build error

In order to break a header dependency between lockdep and task_struct,
I need per-cpu stuff from lockdep.

Including <asm/percpu.h> from lockdep.h gives a build error, this
patch cures that, but results in the following warning:

../arch/sparc/include/asm/percpu_64.h:7:24: warning: call-clobbered register used for global register variable
register unsigned long __local_per_cpu_offset asm("g5");

But i've no idea how to fix that :/ but it does build.

Not-Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 arch/sparc/include/asm/trap_block.h |    2 ++
 1 file changed, 2 insertions(+)

--- 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>