strange grammar of c for l-value (in linux kernel: per_cpu) -

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all.

When I was looking at the Linux kernel source, I found this snippet: 

  per_cpu (zcache_dstmem, cpu) = null;   
 If I look at the definition of per_cpu, then it happens:  
  #defineVERIFY_PERCPU_PTR (__p) ({\ __verify_pcpu_ptr (__p )); \ (Typhus (* (__p)) __kernel __force *) (__p); \}) #define per_cpu (var, cpu) (* ((zero) (CPU), VERIFY_PERCPU_PTR (& amp; var)))   
 If I parse preprocessors , Then it becomes:  
  * ((zero) (CPU), {__verify_pcpu_ptr (& amp; zcache_dstmem); (typef (zcache_dstmem) __call _-force *) (__p );}} = = NULL   
 I feel very strong that I read it incorrectly, and I do not know how to interpret this snippet. Any help?   
 
 
 Missed one replacement  
  * ((zero) (cpu) , {__verify_pcpu_ptr (& amp; zcache_dstmem); (typef (zcache_dstmem) __kernel __force *) (& amp; zcache_dstmem);}) = NULL   
 This is an example of a comma is. The result of the block is the last expression I do not know what it is doing with  (zero) (cpu)  part, but  and zcache_dstmem  looks like it is set to tap Happening? Best wishes are ignoring this!

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