linux-kernel - Re: [PATCH 02/16] mm: Prepare for FAULT_FLAG

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Message-ID: <20170809100835.5kz3zf5sd3oqrrj4@node.shutemov.name>
Date:   Wed, 9 Aug 2017 13:08:35 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Laurent Dufour <ldufour@...ux.vnet.ibm.com>
Cc:     paulmck@...ux.vnet.ibm.com, peterz@...radead.org,
        akpm@...ux-foundation.org, ak@...ux.intel.com, mhocko@...nel.org,
        dave@...olabs.net, jack@...e.cz,
        Matthew Wilcox <willy@...radead.org>, benh@...nel.crashing.org,
        mpe@...erman.id.au, paulus@...ba.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, hpa@...or.com,
        Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        haren@...ux.vnet.ibm.com, khandual@...ux.vnet.ibm.com,
        npiggin@...il.com, bsingharora@...il.com,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org
Subject: Re: [PATCH 02/16] mm: Prepare for FAULT_FLAG_SPECULATIVE

On Tue, Aug 08, 2017 at 04:35:35PM +0200, Laurent Dufour wrote:
> @@ -2295,7 +2302,11 @@ static int wp_page_copy(struct vm_fault *vmf)
>  	/*
>  	 * Re-check the pte - we dropped the lock
>  	 */
> -	vmf->pte = pte_offset_map_lock(mm, vmf->pmd, vmf->address, &vmf->ptl);
> +	if (!pte_map_lock(vmf)) {
> +		mem_cgroup_cancel_charge(new_page, memcg, false);
> +		ret = VM_FAULT_RETRY;
> +		goto oom_free_new;

With the change, label is misleading.

> +	}
>  	if (likely(pte_same(*vmf->pte, vmf->orig_pte))) {
>  		if (old_page) {
>  			if (!PageAnon(old_page)) {

-- 
 Kirill A. Shutemov