linux-kernel - Re: [PATCH v6 10/10] mm/memory_hotplug: Cleanup __remove

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Message-ID: <20200204131353.GJ22482@gate.crashing.org>
Date:   Tue, 4 Feb 2020 07:13:53 -0600
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     Oscar Salvador <osalvador@...e.de>, linux-s390@...r.kernel.org,
        Michal Hocko <mhocko@...e.com>, linux-ia64@...r.kernel.org,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        linux-sh@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Wei Yang <richardw.yang@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linuxppc-dev@...ts.ozlabs.org,
        Dan Williams <dan.j.williams@...el.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 10/10] mm/memory_hotplug: Cleanup __remove_pages()

On Tue, Feb 04, 2020 at 01:41:06PM +0100, David Hildenbrand wrote:
> On 04.02.20 10:46, Oscar Salvador wrote:
> > I have to confess that it took me while to wrap around my head
> > with the new min() change, but looks ok:
> 
> It's a pattern commonly used in compilers and emulators to calculate the
> number of bytes to the next block/alignment. (we're missing a macro
> (like we have ALIGN_UP/IS_ALIGNED) for that - but it's hard to come up
> with a good name (e.g., SIZE_TO_NEXT_ALIGN) .

You can just write the easy to understand

  ...  ALIGN_UP(x) - x  ...

which is better *without* having a separate name.  Does that not
generate good machine code for you?


Segher