linux-kernel - Re: [RFC REBASED 3/5] powerpc/mm/slice: implement slice_check_range

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Message-Id: <87k1uy7vbr.fsf@linux.vnet.ibm.com>
Date:   Tue, 27 Feb 2018 12:50:08 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Nicholas Piggin <npiggin@...il.com>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC REBASED 3/5] powerpc/mm/slice: implement slice_check_range_fits

Christophe Leroy <christophe.leroy@....fr> writes:
 +	if ((start + len) > SLICE_LOW_TOP) {
> +		unsigned long start_index = GET_HIGH_SLICE_INDEX(start);
> +		unsigned long align_end = ALIGN(end, (1UL << SLICE_HIGH_SHIFT));
> +		unsigned long count = GET_HIGH_SLICE_INDEX(align_end) - start_index;
> +		unsigned long i;
>  
> -	slice_bitmap_and(result, mask->high_slices, available->high_slices,
> -			 slice_count);
> +		for (i = start_index; i < start_index + count; i++) {
> +			if (!test_bit(i, available->high_slices))
> +				return false;
> +		}
> +	}

why not bitmap_equal here instead of test_bit in loop?
>  
> -	return (mask->low_slices & available->low_slices) == mask->low_slices &&
> -		slice_bitmap_equal(result, mask->high_slices, slice_count);
> +	return true;
>  }

-aneesh