linux-kernel - Re: + mm-revert-thp-make-madv_hugepage-check-for-mm-def

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Message-ID: <20140226180807.GB25644@redhat.com>
Date:	Wed, 26 Feb 2014 19:08:07 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Christian Borntraeger <borntraeger@...ibm.com>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, schwidefsky@...ibm.com,
	rientjes@...gle.com, riel@...hat.com, pbonzini@...hat.com,
	mingo@...nel.org, mgorman@...e.de, kirill.shutemov@...ux.intel.com,
	heiko.carstens@...ibm.com, hannes@...xchg.org,
	gerald.schaefer@...ibm.com, ebiederm@...ssion.com,
	aarcange@...hat.com, athorlton@....com
Subject: Re: +
	mm-revert-thp-make-madv_hugepage-check-for-mm-def_flags.patch added
	to -mm tree

On 02/26, Peter Zijlstra wrote:
>
> On Wed, Feb 26, 2014 at 04:31:44PM +0100, Oleg Nesterov wrote:
> >  		/*
> > @@ -1977,8 +1975,12 @@ int hugepage_madvise(struct vm_area_stru
> >  		 */
> >  		if (*vm_flags & (VM_HUGEPAGE | VM_NO_THP))
> >  			return -EINVAL;
> > -		if (mm->def_flags & VM_NOHUGEPAGE)
> > +
> > +#ifdef CONFIG_S390
>
> Do we want a comment here, explaining why s390 is special again?

Yes, yes, sure. Especially because this is (hopefully) the temporary
hack.

Oleg.

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