Re: [PATCH 3/5] iomap: simplify iomap_init() with PAGE_SECTORS

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 4/21/23 4:02 PM, Luis Chamberlain wrote:
> On Fri, Apr 21, 2023 at 09:14:00PM +0100, Matthew Wilcox wrote:
>> On Fri, Apr 21, 2023 at 12:58:05PM -0700, Luis Chamberlain wrote:
>>> Just use the PAGE_SECTORS generic define. This produces no functional
>>> changes. While at it use left shift to simplify this even further.
>>
>> How is FOO << 2 simpler than FOO * 4?
>>
>>> -	return bioset_init(&iomap_ioend_bioset, 4 * (PAGE_SIZE / SECTOR_SIZE),
>>> +	return bioset_init(&iomap_ioend_bioset, PAGE_SECTORS << 2,
> 
> We could just do:
> 
> 
> -	return bioset_init(&iomap_ioend_bioset, 4 * (PAGE_SIZE / SECTOR_SIZE),
> +	return bioset_init(&iomap_ioend_bioset, 4 * PAGE_SECTORS,
> 
> The shift just seemed optimal if we're just going to change it.

It's going to generate the same code, but the multiplication is arguably
easier to read (or harder to misread).

-- 
Jens Axboe





[Index of Archives]     [Linux RAID]     [Linux SCSI]     [Linux ATA RAID]     [IDE]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Device Mapper]

  Powered by Linux