linux-kernel - Re: [PATCH V7] mm/debug: Add tests validating architecture page table helpers

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Message-ID: <ccdd4f7a-c7dc-ca10-d30c-0bc05c7136c7@arm.com>
Date:   Fri, 25 Oct 2019 09:16:07 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Qian Cai <cai@....pw>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Dan Williams <dan.j.williams@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michal Hocko <mhocko@...nel.org>,
        Mark Rutland <Mark.Rutland@....com>,
        Mark Brown <broonie@...nel.org>,
        Steven Price <Steven.Price@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Kees Cook <keescook@...omium.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Matthew Wilcox <willy@...radead.org>,
        Sri Krishna chowdary <schowdary@...dia.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Vineet Gupta <vgupta@...opsys.com>,
        James Hogan <jhogan@...nel.org>,
        Paul Burton <paul.burton@...s.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Ingo Molnar <mingo@...nel.org>,
        linux-snps-arc@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V7] mm/debug: Add tests validating architecture page table
 helpers



On 10/24/2019 10:21 PM, Qian Cai wrote:
> 
> 
>> On Oct 24, 2019, at 10:50 AM, Anshuman Khandual <Anshuman.Khandual@....com> wrote:
>>
>> Changes in V7:
>>
>> - Memory allocation and free routines for mapped pages have been droped
>> - Mapped pfns are derived from standard kernel text symbol per Matthew
>> - Moved debug_vm_pgtaable() after page_alloc_init_late() per Michal and Qian 
>> - Updated the commit message per Michal
>> - Updated W=1 GCC warning problem on x86 per Qian Cai
> 
> It would be interesting to know if you actually tested  out to see if the warning went away. As far I can tell, the GCC is quite stubborn there, so I am not going to insist.
> 

Nothing specific. But just tested this with x86 defconfig with relevant configs
which are required for this test. Not sure if it involved W=1. The problem is,
there is no other or better way to have both the conditional checks in place
while also reducing the chances this warning. IMHO both the conditional checks
are required.