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

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Message-ID: <fd1be042-c957-feb3-05d5-11244a3626da@c-s.fr>
Date:   Wed, 11 Apr 2018 10:59:58 +0200
From:   Christophe LEROY <christophe.leroy@....fr>
To:     Laurent Dufour <ldufour@...ux.vnet.ibm.com>,
        Michal Hocko <mhocko@...nel.org>
Cc:     Rich Felker <dalias@...c.org>, linux-doc@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Will Deacon <will.deacon@....com>, x86@...nel.org,
        linux-mm@...ck.org, paulus@...ba.org, sparclinux@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Jonathan Corbet <corbet@....net>, linux-sh@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        linux-snps-arc@...ts.infradead.org,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        David Rientjes <rientjes@...gle.com>,
        Robin Murphy <robin.murphy@....com>,
        Jerome Glisse <jglisse@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org,
        Vineet Gupta <vgupta@...opsys.com>,
        linux-kernel@...r.kernel.org, aneesh.kumar@...ux.vnet.ibm.com,
        Albert Ou <albert@...ive.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        akpm@...ux-foundation.org, linuxppc-dev@...ts.ozlabs.org,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH v3 2/2] mm: remove odd HAVE_PTE_SPECIAL



Le 11/04/2018 à 10:41, Laurent Dufour a écrit :
> On 11/04/2018 10:33, Michal Hocko wrote:
>> 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?
> Indeed the compiler doesn't complaint but in theory it should since these
> labels are not used depending on CONFIG_ARCH_HAS_PTE_SPECIAL.

Why should it complain ?

Regards
Christophe

>