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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
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