Re: [PATCH] fix alloc_large_system_hash roundup

 >  	/* rounded up to nearest power of 2 in size */
 > -	numentries = 1UL << (long_log2(numentries) + 1);
 > +	numentries = 1UL << (long_log2(2*numentries - 1));

How about just using roundup_pow_of_two()?  You could kill the comment
too then.

 - R.
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