linux-kernel - Re: [PATCH 2/3] mm/sparse: Optimize sparse_add_one

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Date:   Wed, 20 Mar 2019 16:03:34 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Mike Rapoport <rppt@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        pasha.tatashin@...cle.com, mhocko@...e.com,
        rppt@...ux.vnet.ibm.com, richard.weiyang@...il.com,
        linux-mm@...ck.org
Subject: Re: [PATCH 2/3] mm/sparse: Optimize sparse_add_one_section()

On 03/20/19 at 09:56am, Mike Rapoport wrote:
> > diff --git a/mm/sparse.c b/mm/sparse.c
> > index 0a0f82c5d969..054b99f74181 100644
> > --- a/mm/sparse.c
> > +++ b/mm/sparse.c
> > @@ -697,16 +697,17 @@ int __meminit sparse_add_one_section(int nid, unsigned long start_pfn,
> >  	ret = sparse_index_init(section_nr, nid);
> >  	if (ret < 0 && ret != -EEXIST)
> >  		return ret;
> > -	ret = 0;
> > -	memmap = kmalloc_section_memmap(section_nr, nid, altmap);
> > -	if (!memmap)
> > -		return -ENOMEM;
> > +
> >  	usemap = __kmalloc_section_usemap();
> > -	if (!usemap) {
> > -		__kfree_section_memmap(memmap, altmap);
> > +	if (!usemap)
> > +		return -ENOMEM;
> > +	memmap = kmalloc_section_memmap(section_nr, nid, altmap);
> > +	if (!memmap) {
> > +		kfree(usemap);
> 
> If you are anyway changing this why not to switch to goto's for error
> handling?

OK, I am fine to switch to 'goto'. Will update and repost. Thanks.

> 
> >  		return -ENOMEM;
> >  	}
> > 
> > +	ret = 0;
> >  	ms = __pfn_to_section(start_pfn);
> >  	if (ms->section_mem_map & SECTION_MARKED_PRESENT) {
> >  		ret = -EEXIST;
> > -- 
> > 2.17.2
> > 
> 
> -- 
> Sincerely yours,
> Mike.
>