Messages in this thread | | | Subject | Re: [PATCH] locking/arch: Move qrwlock.h include after qspinlock.h | From | Paolo Bonzini <> | Date | Wed, 10 Feb 2021 19:28:56 +0100 |
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On 10/02/21 15:45, Waiman Long wrote: > The queued rwlock code has a dependency on the current spinlock > implementation (likely to be qspinlock), but not vice versa. Including > qrwlock.h before qspinlock.h can be problematic when expanding qrwlock > functionality. > > If both qspinlock.h and qrwlock.h are to be included, the qrwlock.h > include should always be after qspinlock.h. Update the current set of > asm/spinlock.h files to enforce that. > > Signed-off-by: Waiman Long <longman@redhat.com>
arch/sparc/include/asm/spinlock_64.h is missing. Also, the include in kernel/locking/qrwlock.c is not necessary (it may be there for aesthetic reasons, but it complicates thing in this case).
I'll send a v2 that is based on the kvm/next tree.
Paolo
> --- > arch/arm64/include/asm/spinlock.h | 2 +- > arch/mips/include/asm/spinlock.h | 2 +- > arch/xtensa/include/asm/spinlock.h | 2 +- > 3 files changed, 3 insertions(+), 3 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/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() > >
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