• C
    percpu: Generic support for this_cpu_cmpxchg_double() · 7c334339
    Christoph Lameter 提交于
    Introduce this_cpu_cmpxchg_double().  this_cpu_cmpxchg_double() allows
    the comparison between two consecutive words and replaces them if
    there is a match.
    
    	bool this_cpu_cmpxchg_double(pcp1, pcp2,
    		old_word1, old_word2, new_word1, new_word2)
    
    this_cpu_cmpxchg_double does not return the old value (difficult since
    there are two words) but a boolean indicating if the operation was
    successful.
    
    The first percpu variable must be double word aligned!
    
    -tj: Updated to return bool instead of int, converted size check to
         BUILD_BUG_ON() instead of VM_BUG_ON() and other cosmetic changes.
    Signed-off-by: NChristoph Lameter <cl@linux.com>
    Signed-off-by: NTejun Heo <tj@kernel.org>
    7c334339
percpu.h 31.5 KB