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  • Davidlohr Bueso's avatar
    locking/mutexes: Documentation update/rewrite · 9161f540
    Davidlohr Bueso authored
    
    
    Our mutexes have gone a long ways since the original
    implementation back in 2005/2006. However, the mutex-design.txt
    document is still stuck in the past, to the point where most of
    the information there is practically useless and, more
    important, simply incorrect. This patch pretty much rewrites it
    to resemble what we have nowadays.
    
    Since regular semaphores are almost much extinct in the kernel
    (most users now rely on mutexes or rwsems), it no longer makes
    sense to have such a close comparison, which was copied from
    most of the cover letter when Ingo introduced the generic mutex
    subsystem.
    
    Note that ww_mutexes are intentionally left out, leaving things
    as generic as possible.
    
    Signed-off-by: default avatarDavidlohr Bueso <davidlohr@hp.com>
    Cc: tim.c.chen@linux.intel.com
    Cc: paulmck@linux.vnet.ibm.com
    Cc: waiman.long@hp.com
    Cc: jason.low2@hp.com
    Cc: aswin@hp.com
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Link: http://lkml.kernel.org/r/1401338203.2618.11.camel@buesod1.americas.hpqcorp.net
    
    
    Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
    9161f540