linux-kernel - Re: [PATCH v3 2/2] mm: remove odd HAVE_PTE

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Message-ID: <20180411083315.GA23400@dhcp22.suse.cz>
Date:   Wed, 11 Apr 2018 10:33:15 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Laurent Dufour <ldufour@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org,
        linux-doc@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        Jerome Glisse <jglisse@...hat.com>,
        aneesh.kumar@...ux.vnet.ibm.com, akpm@...ux-foundation.org,
        mpe@...erman.id.au, benh@...nel.crashing.org, paulus@...ba.org,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S . Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <albert@...ive.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        David Rientjes <rientjes@...gle.com>,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH v3 2/2] mm: remove odd HAVE_PTE_SPECIAL

On Wed 11-04-18 10:03:36, Laurent Dufour wrote:
> @@ -881,7 +876,8 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>  
>  	if (is_zero_pfn(pfn))
>  		return NULL;
> -check_pfn:
> +
> +check_pfn: __maybe_unused
>  	if (unlikely(pfn > highest_memmap_pfn)) {
>  		print_bad_pte(vma, addr, pte, NULL);
>  		return NULL;
> @@ -891,7 +887,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
>  	 * NOTE! We still have PageReserved() pages in the page tables.
>  	 * eg. VDSO mappings can cause them to exist.
>  	 */
> -out:
> +out: __maybe_unused
>  	return pfn_to_page(pfn);

Why do we need this ugliness all of the sudden?

-- 
Michal Hocko
SUSE Labs