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authorWaiman Long <longman@redhat.com>2021-02-10 21:16:31 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2021-02-11 15:59:54 +0300
commitd8d0da4eee5c4e86ea08abde6975848376b4ac13 (patch)
treedf7d562b9d39161d947da8ddd68f07f0cfda43d7
parent9294b8a12585f8b4ccb9c060b54bab0bd13f24b9 (diff)
downloadlinux-d8d0da4eee5c4e86ea08abde6975848376b4ac13.tar.xz
locking/arch: Move qrwlock.h include after qspinlock.h
include/asm-generic/qrwlock.h was trying to get arch_spin_is_locked via asm-generic/qspinlock.h. However, this does not work because architectures might be using queued rwlocks but not queued spinlocks (csky), or because they might be defining their own queued_* macros before including asm/qspinlock.h. To fix this, ensure that asm/spinlock.h always includes qrwlock.h after defining arch_spin_is_locked (either directly for csky, or via asm/qspinlock.h for other architectures). The only inclusion elsewhere is in kernel/locking/qrwlock.c. That one is really unnecessary because the file is only compiled in SMP configurations (config QUEUED_RWLOCKS depends on SMP) and in that case linux/spinlock.h already includes asm/qrwlock.h if needed, via asm/spinlock.h. Reported-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Waiman Long <longman@redhat.com> Fixes: 26128cb6c7e6 ("locking/rwlocks: Add contention detection for rwlocks") Tested-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Ben Gardon <bgardon@google.com> [Add arch/sparc and kernel/locking parts per discussion with Waiman. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-rw-r--r--arch/arm64/include/asm/spinlock.h2
-rw-r--r--arch/mips/include/asm/spinlock.h2
-rw-r--r--arch/sparc/include/asm/spinlock_64.h2
-rw-r--r--arch/xtensa/include/asm/spinlock.h2
-rw-r--r--include/asm-generic/qrwlock.h3
-rw-r--r--kernel/locking/qrwlock.c1
6 files changed, 6 insertions, 6 deletions
diff --git a/arch/arm64/include/asm/spinlock.h b/arch/arm64/include/asm/spinlock.h
index 9083d6992603..0525c0b089ed 100644
--- a/arch/arm64/include/asm/spinlock.h
+++ b/arch/arm64/include/asm/spinlock.h
@@ -5,8 +5,8 @@
#ifndef __ASM_SPINLOCK_H
#define __ASM_SPINLOCK_H
-#include <asm/qrwlock.h>
#include <asm/qspinlock.h>
+#include <asm/qrwlock.h>
/* See include/linux/spinlock.h */
#define smp_mb__after_spinlock() smp_mb()
diff --git a/arch/mips/include/asm/spinlock.h b/arch/mips/include/asm/spinlock.h
index 8a88eb265516..6ce2117e49f6 100644
--- a/arch/mips/include/asm/spinlock.h
+++ b/arch/mips/include/asm/spinlock.h
@@ -10,7 +10,6 @@
#define _ASM_SPINLOCK_H
#include <asm/processor.h>
-#include <asm/qrwlock.h>
#include <asm-generic/qspinlock_types.h>
@@ -27,5 +26,6 @@ static inline void queued_spin_unlock(struct qspinlock *lock)
}
#include <asm/qspinlock.h>
+#include <asm/qrwlock.h>
#endif /* _ASM_SPINLOCK_H */
diff --git a/arch/sparc/include/asm/spinlock_64.h b/arch/sparc/include/asm/spinlock_64.h
index 7fc82a233f49..3a9a0b0c7465 100644
--- a/arch/sparc/include/asm/spinlock_64.h
+++ b/arch/sparc/include/asm/spinlock_64.h
@@ -11,8 +11,8 @@
#include <asm/processor.h>
#include <asm/barrier.h>
-#include <asm/qrwlock.h>
#include <asm/qspinlock.h>
+#include <asm/qrwlock.h>
#endif /* !(__ASSEMBLY__) */
diff --git a/arch/xtensa/include/asm/spinlock.h b/arch/xtensa/include/asm/spinlock.h
index 584b0de6f2ca..41c449ece2d8 100644
--- a/arch/xtensa/include/asm/spinlock.h
+++ b/arch/xtensa/include/asm/spinlock.h
@@ -12,8 +12,8 @@
#define _XTENSA_SPINLOCK_H
#include <asm/barrier.h>
-#include <asm/qrwlock.h>
#include <asm/qspinlock.h>
+#include <asm/qrwlock.h>
#define smp_mb__after_spinlock() smp_mb()
diff --git a/include/asm-generic/qrwlock.h b/include/asm-generic/qrwlock.h
index 0020d3b820a7..7ae0ece07b4e 100644
--- a/include/asm-generic/qrwlock.h
+++ b/include/asm-generic/qrwlock.h
@@ -14,7 +14,8 @@
#include <asm/processor.h>
#include <asm-generic/qrwlock_types.h>
-#include <asm-generic/qspinlock.h>
+
+/* Must be included from asm/spinlock.h after defining arch_spin_is_locked. */
/*
* Writer states & reader shift and bias.
diff --git a/kernel/locking/qrwlock.c b/kernel/locking/qrwlock.c
index fe9ca92faa2a..4786dd271b45 100644
--- a/kernel/locking/qrwlock.c
+++ b/kernel/locking/qrwlock.c
@@ -12,7 +12,6 @@
#include <linux/percpu.h>
#include <linux/hardirq.h>
#include <linux/spinlock.h>
-#include <asm/qrwlock.h>
/**
* queued_read_lock_slowpath - acquire read lock of a queue rwlock