linux-kernel - Re: [PATCH 1/2] mm, memory_hotplug: cleanup memory offline path

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Date:   Thu, 4 Apr 2019 17:40:09 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     David Hildenbrand <david@...hat.com>
Cc:     akpm@...ux-foundation.org, mhocko@...e.com,
        dan.j.williams@...el.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH 1/2] mm, memory_hotplug: cleanup memory offline path

On Thu, Apr 04, 2019 at 04:47:43PM +0200, David Hildenbrand wrote:
> On 04.04.19 15:25, Oscar Salvador wrote:
> > On Thu, Apr 04, 2019 at 03:18:00PM +0200, David Hildenbrand wrote:
> >>> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> >>> index f206b8b66af1..d8a3e9554aec 100644
> >>> --- a/mm/memory_hotplug.c
> >>> +++ b/mm/memory_hotplug.c
> >>> @@ -1451,15 +1451,11 @@ static int
> >>>  offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages,
> >>>  			void *data)
> >>>  {
> >>> -	__offline_isolated_pages(start, start + nr_pages);
> >>> -	return 0;
> >>> -}
> >>> +	unsigned long offlined_pages;
> >>>  
> >>> -static void
> >>> -offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
> >>> -{
> >>> -	walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL,
> >>> -				offline_isolated_pages_cb);
> >>> +	offlined_pages = __offline_isolated_pages(start, start + nr_pages);
> >>> +	*(unsigned long *)data += offlined_pages;
> >>
> >> unsigned long *offlined_pages = data;
> >>
> >> *offlined_pages += __offline_isolated_pages(start, start + nr_pages);
> > 
> > Yeah, more readable.
> > 
> >> Only nits
> > 
> > About the identation, I double checked the code and it looks fine to me.
> > In [1] looks fine too, might be your mail client?
> > 
> > [1] https://patchwork.kernel.org/patch/10885571/
> 
> Double checked, alignment on the parameter on the new line is very weird.

Uhm, are not you confused because we removed the "while (off...)", and
"ret =" gets idented right below "/*check again*".

Try to apply the patch and check whether you still see the issue.
I just checked out the branch and it looks fine to me.

> And both lines cross 80 lines per line ... nit :)

Yeah, 81 characters, but I decided to go with that rather than start doing
tricky things to accomplish 80 characters.
Maybe Andrew agrees, or he might slap me.

-- 
Oscar Salvador
SUSE L3