yf13 commented on PR #12041:
URL: https://github.com/apache/nuttx/pull/12041#issuecomment-2062917969

   > 
   > Yes, the caller pass byte unit, but it is round up to page unit internally.
   
   This helper is for callers like `fb_mmap()` to use, where byte unit looks 
more natural. The helper can do VM allocation, unit conversion and do looping 
call to up_shmat internally, these processing may take a dozen of LOCs. By 
wrapping them in the helper, the caller side can be simpler.
   


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