linux-kernel - Re: [PATCH 1/2] mm/vmalloc: Add interfaces to free unused page table

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Date:   Thu, 8 Mar 2018 14:07:08 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     "Kani, Toshi" <toshi.kani@....com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bp@...e.de" <bp@...e.de>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "guohanjun@...wei.com" <guohanjun@...wei.com>,
        "wxf.wang@...ilicon.com" <wxf.wang@...ilicon.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "hpa@...or.com" <hpa@...or.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "will.deacon@....com" <will.deacon@....com>,
        "Hocko, Michal" <mhocko@...e.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] mm/vmalloc: Add interfaces to free unused page table

On Thu, Mar 08, 2018 at 03:56:30PM +0000, Kani, Toshi wrote:
> On Wed, 2018-03-07 at 20:00 -0800, Matthew Wilcox wrote:
> > On Wed, Mar 07, 2018 at 11:32:26AM -0700, Toshi Kani wrote:
> > > +/**
> > > + * pud_free_pmd_page - clear pud entry and free pmd page
> > > + *
> > > + * Returns 1 on success and 0 on failure (pud not cleared).
> > > + */
> > > +int pud_free_pmd_page(pud_t *pud)
> > > +{
> > > +	return pud_none(*pud);
> > > +}
> > 
> > Wouldn't it be clearer if you returned 'bool' instead of 'int' here?
> 
> I thought about it and decided to use 'int' since all other pud/pmd/pte
> interfaces, such as pud_none() above, use 'int'.

These interfaces were introduced before we had bool ... I suspect nobody's
taken the time to go through and convert them all.