1. 27 8月, 2008 1 次提交
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      Blackfin arch: defines and provides entry points for certain user space... · 7adfb58f
      Bernd Schmidt 提交于
      Blackfin arch: defines and provides entry points for certain user space functions at fixed addresses
      
      This patch defines (and provides) entry points for certain user space functions
      at fixed addresses.  The Blackfin has no usable atomic instructions, but we can
      ensure that these code sequences appear atomic from a user space point of view
      by detecting when we're in the process of executing them during the interrupt
      handler return path.  This allows much more efficient pthread lock
      implementations than the bfin_spinlock syscall we're currently using.
      
      Also provided is a small sys_rt_sigreturn stub which can be used by the signal
      handler setup code.  The signal.c part will be committed separately.
      Signed-off-by: NBernd Schmidt <bernd.schmidt@analog.com>
      Signed-off-by: NBryan Wu <bryan.wu@analog.com>
      
      7adfb58f