linux-kernel - [PATCH v2 1/7] kernel/locking: Fix compile error with qrwlock.c

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Date:   Fri, 19 May 2017 18:16:55 -0600
From:   Babu Moger <babu.moger@...cle.com>
To:     davem@...emloft.net, peterz@...radead.org, mingo@...hat.com,
        arnd@...db.de
Cc:     babu.moger@...cle.com, shannon.nelson@...cle.com,
        haakon.bugge@...cle.com, steven.sistare@...cle.com,
        vijay.ac.kumar@...cle.com, jane.chu@...cle.com,
        sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: [PATCH v2 1/7] kernel/locking: Fix compile error with qrwlock.c

Some architectures use the following guard in include file
 "asm/spinlock_types.h" to discourage including the file directly.

Saw these compile errors on SPARC when queued rwlock feature is enabled.

  CC      kernel/locking/qrwlock.o
In file included from ./include/asm-generic/qrwlock_types.h:5,
                 from ./arch/sparc/include/asm/qrwlock.h:4,
                 from kernel/locking/qrwlock.c:24:
./arch/sparc/include/asm/spinlock_types.h:5:3: error:
        #error "please don't include this file directly"

Re-arrange the includes in qrwlock_types.h and include spinlock.h
in qrwlock.c to fix it.

Also will be removing this stanza from SPARC. Stay tuned.

Signed-off-by: Babu Moger <babu.moger@...cle.com>
Reviewed-by: Håkon Bugge <haakon.bugge@...cle.com>
Reviewed-by: Jane Chu <jane.chu@...cle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@...cle.com>
Reviewed-by: Vijay Kumar <vijay.ac.kumar@...cle.com>
---
 include/asm-generic/qrwlock_types.h |    6 +++---
 kernel/locking/qrwlock.c            |    1 +
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/asm-generic/qrwlock_types.h b/include/asm-generic/qrwlock_types.h
index 0abc6b6..3988c7d 100644
--- a/include/asm-generic/qrwlock_types.h
+++ b/include/asm-generic/qrwlock_types.h
@@ -1,9 +1,6 @@
 #ifndef __ASM_GENERIC_QRWLOCK_TYPES_H
 #define __ASM_GENERIC_QRWLOCK_TYPES_H
 
-#include <linux/types.h>
-#include <asm/spinlock_types.h>
-
 /*
  * The queue read/write lock data structure
  */
@@ -18,4 +15,7 @@
 	.wait_lock = __ARCH_SPIN_LOCK_UNLOCKED,	\
 }
 
+#include <linux/types.h>
+#include <linux/spinlock_types.h>
+
 #endif /* __ASM_GENERIC_QRWLOCK_TYPES_H */
diff --git a/kernel/locking/qrwlock.c b/kernel/locking/qrwlock.c
index cc3ed0c..2655f26 100644
--- a/kernel/locking/qrwlock.c
+++ b/kernel/locking/qrwlock.c
@@ -20,6 +20,7 @@
 #include <linux/cpumask.h>
 #include <linux/percpu.h>
 #include <linux/hardirq.h>
+#include <linux/spinlock.h>
 #include <asm/qrwlock.h>
 
 /*
-- 
1.7.1