linux-kernel - Re: [PATCH] mm/numa_memblks: Use SZ_1M macro to denote bytes to MB conversion

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Message-ID: <CALzOmR2zOpiN_u1GfudY8QKWOf=w3ytOPuK-dznY7bqKJgJGnA@mail.gmail.com>
Date: Wed, 20 Aug 2025 06:09:14 +0530
From: Pratyush Brahma <pratyush.brahma@....qualcomm.com>
To: Mike Rapoport <rppt@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/numa_memblks: Use SZ_1M macro to denote bytes to MB conversion

On Tue, Aug 19, 2025 at 8:11 PM Mike Rapoport <rppt@...nel.org> wrote:
>
> On Tue, Aug 19, 2025 at 02:21:44PM +0530, pratyush.brahma@....qualcomm.com wrote:
> > From: Pratyush Brahma <pratyush.brahma@....qualcomm.com>
> >
> > Replace the manual bitwise conversion of bytes to MB with
> > SZ_1M macro, a standard macro used within the mm subsystem,
> > to improve readability.
>
> There are few others:
>
> $ git grep '>> 20' mm/
> mm/memblock.c:          mem_size_mb = memblock_phys_mem_size() >> 20;
> mm/memblock.c:                 (nr_pages << PAGE_SHIFT) >> 20, mem_size_mb);
> mm/numa_emulation.c:           nid, eb->start, eb->end - 1, (eb->end - eb->start) >> 20);
> mm/numa_emulation.c:                    size >> 20, min_size >> 20);
>
> It makes sense to replace all of them in one patch.
Thanks for checking. Will send an updated patch in the next iteration.
>
> > Signed-off-by: Pratyush Brahma <pratyush.brahma@....qualcomm.com>
> > ---
> >  mm/numa_memblks.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/mm/numa_memblks.c b/mm/numa_memblks.c
> > index 541a99c4071a67e5b0ef66f4136dee268a880003..a47aa262a33366337c38ccc7c7064da818523dd2 100644
> > --- a/mm/numa_memblks.c
> > +++ b/mm/numa_memblks.c
> > @@ -427,9 +427,9 @@ static int __init numa_register_meminfo(struct numa_meminfo *mi)
> >               unsigned long pfn_align = node_map_pfn_alignment();
> >
> >               if (pfn_align && pfn_align < PAGES_PER_SECTION) {
> > -                     unsigned long node_align_mb = PFN_PHYS(pfn_align) >> 20;
> > +                     unsigned long node_align_mb = PFN_PHYS(pfn_align) / SZ_1M;
> >
> > -                     unsigned long sect_align_mb = PFN_PHYS(PAGES_PER_SECTION) >> 20;
> > +                     unsigned long sect_align_mb = PFN_PHYS(PAGES_PER_SECTION) / SZ_1M;
> >
> >                       pr_warn("Node alignment %luMB < min %luMB, rejecting NUMA config\n",
> >                               node_align_mb, sect_align_mb);
> >
> > ---
> > base-commit: c17b750b3ad9f45f2b6f7e6f7f4679844244f0b9
> > change-id: 20250819-numa-memblks-refac-7b4b5017b598
> >
> > Best regards,
> > --
> > Pratyush Brahma <pratyush.brahma@....qualcomm.com>
> >
>
> --
> Sincerely yours,
> Mike.
Thanks & Regards
Pratyush