• W
    locking/rwsem: Remove rwsem-spinlock.c & use rwsem-xadd.c for all archs · 390a0c62
    Waiman Long 提交于
    Currently, we have two different implementation of rwsem:
    
     1) CONFIG_RWSEM_GENERIC_SPINLOCK (rwsem-spinlock.c)
     2) CONFIG_RWSEM_XCHGADD_ALGORITHM (rwsem-xadd.c)
    
    As we are going to use a single generic implementation for rwsem-xadd.c
    and no architecture-specific code will be needed, there is no point
    in keeping two different implementations of rwsem. In most cases, the
    performance of rwsem-spinlock.c will be worse. It also doesn't get all
    the performance tuning and optimizations that had been implemented in
    rwsem-xadd.c over the years.
    
    For simplication, we are going to remove rwsem-spinlock.c and make all
    architectures use a single implementation of rwsem - rwsem-xadd.c.
    
    All references to RWSEM_GENERIC_SPINLOCK and RWSEM_XCHGADD_ALGORITHM
    in the code are removed.
    Suggested-by: NPeter Zijlstra <peterz@infradead.org>
    Signed-off-by: NWaiman Long <longman@redhat.com>
    Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
    Acked-by: NLinus Torvalds <torvalds@linux-foundation.org>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Arnd Bergmann <arnd@arndb.de>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Davidlohr Bueso <dave@stgolabs.net>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Tim Chen <tim.c.chen@linux.intel.com>
    Cc: Will Deacon <will.deacon@arm.com>
    Cc: linux-arm-kernel@lists.infradead.org
    Cc: linux-c6x-dev@linux-c6x.org
    Cc: linux-m68k@lists.linux-m68k.org
    Cc: linux-riscv@lists.infradead.org
    Cc: linux-um@lists.infradead.org
    Cc: linux-xtensa@linux-xtensa.org
    Cc: linuxppc-dev@lists.ozlabs.org
    Cc: nios2-dev@lists.rocketboards.org
    Cc: openrisc@lists.librecores.org
    Cc: uclinux-h8-devel@lists.sourceforge.jp
    Link: https://lkml.kernel.org/r/20190322143008.21313-3-longman@redhat.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
    390a0c62
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