From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
To: Anshuman Khandual <anshuman.khandual@arm.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
"linux-ia64@vger.kernel.org" <linux-ia64@vger.kernel.org>,
"linux-sh@vger.kernel.org" <linux-sh@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
James Hogan <jhogan@kernel.org>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Michal Hocko <mhocko@kernel.org>,
Dave Hansen <dave.hansen@intel.com>,
Paul Mackerras <paulus@samba.org>,
"sparclinux@vger.kernel.org" <sparclinux@vger.kernel.org>,
Dan Williams <dan.j.williams@intel.com>,
"linux-s390@vger.kernel.org" <linux-s390@vger.kernel.org>,
Jason Gunthorpe <jgg@ziepe.ca>, "x86@kernel.org" <x86@kernel.org>,
Russell King - ARM Linux <linux@armlinux.org.uk>,
Matthew Wilcox <willy@infradead.org>,
Steven Price <Steven.Price@arm.com>,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
Gerald Schaefer <gerald.schaefer@de.ibm.com>,
"linux-snps-arc@lists.infradead.org"
<linux-snps-arc@lists.infradead.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Ingo Molnar <mingo@kernel.org>, Kees Cook <keescook@chromium.org>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
Mark Brown <broonie@kernel.org>,
"Kirill A . Shutemov" <kirill@shutemov.name>,
Thomas Gleixner <tglx@linutronix.de>,
Vlastimil Babka <vbabka@suse.cz>,
Sri Krishna chowdary <schowdary@nvidia.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"linux-mips@vger.kernel.org" <linux-mips@vger.kernel.org>,
Ralf Baechle <ralf@linux-mips.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Paul Burton <paul.burton@mips.com>,
Mike Rapoport <rppt@linux.vnet.ibm.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH V8] mm/debug: Add tests validating architecture page table helpers
Date: Wed, 6 Nov 2019 18:07:44 +0000 [thread overview]
Message-ID: <b93ffe1f-b198-a042-ecd4-b0f2b0171f72@synopsys.com> (raw)
In-Reply-To: <dc2746c9-bde4-ac00-88d1-2bd1cea1f105@arm.com>
On 11/5/19 7:03 PM, Anshuman Khandual wrote:
> But should not pfn_pmd() be encapsulated inside HAVE_ARCH_TRANSPARENT_HUGEPAGE
> at the minimum (but I would say it should be available always, nonetheless) when
> the platform subscribes to THP irrespective of whether THP is enabled or not.
For ARC it was only introduced/needed when I added THP support so it is dependent
in some way.
> I could see in the file (arch/arc/include/asm/pgtable.h) that fetching pfn_pmd()
> and all other basic PMD definitions is conditional on CONFIG_TRANSPARENT_HUGEPAGE.
>
> #ifdef CONFIG_TRANSPARENT_HUGEPAGE
> #include <asm/hugepage.h>
> #endif
>
> IIUC, CONFIG_TRANSPARENT_HUGEPAGE should only encapsulate PMD page table helpers
> which are expected from generic THP code (pmd_trans_huge, pmdp_set_access_flags
> etc) but not the basic PMD helpers like pmd_pfn, pmd_mkyoung, pmd_mkdirty,
> pmd_mkclean etc.
ARC only has 2 levels of paging, so these don't make any sense in general and
needed only for THP case.
I case of arch/arm you see it is only defined in pgtable-3level.h
> Hence wondering will it be possible to accommodate following
> code change on arc platform (not even compiled) in order to fix the problem ?
I'm open to making changes in ARC code but lets do the right thing.
> */
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> +#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE
> #include <asm/hugepage.h>
> #endif
This in wrong. CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE is a just a glue toggle,
used only in Kconfig files (and not in any "C" code). It enables generic Kconfig
code to allow visibility of CONFIG_TRANSPARENT_HUGEPAGE w/o every arch needing to
do a me too.
I think you need to use CONFIG_TRANSPARENT_HUGEPAGE to guard appropriate tests. I
understand that it only
-Vineet
next prev parent reply other threads:[~2019-11-06 18:20 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-28 5:29 [PATCH V8] mm/debug: Add tests validating architecture page table helpers Anshuman Khandual
2019-10-29 10:31 ` Qian Cai
2019-11-04 2:15 ` Anshuman Khandual
2019-11-05 0:00 ` Anshuman Khandual
2019-11-05 22:30 ` Vineet Gupta
2019-11-06 3:03 ` Anshuman Khandual
2019-11-06 18:07 ` Vineet Gupta [this message]
2019-11-07 4:44 ` Anshuman Khandual
2019-11-07 19:05 ` Vineet Gupta
2019-11-08 4:27 ` Anshuman Khandual
2019-11-11 19:06 ` Vineet Gupta
2019-11-05 0:30 ` Anshuman Khandual
2019-11-05 19:36 ` Gerald Schaefer
2019-11-06 3:10 ` Anshuman Khandual
2019-11-06 3:22 ` Anshuman Khandual
2019-11-06 6:41 ` Christophe Leroy
2019-11-06 7:34 ` Anshuman Khandual
2019-11-07 12:54 ` Michael Ellerman
2019-11-07 13:22 ` Anshuman Khandual
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=b93ffe1f-b198-a042-ecd4-b0f2b0171f72@synopsys.com \
--to=vineet.gupta1@synopsys.com \
--cc=Steven.Price@arm.com \
--cc=akpm@linux-foundation.org \
--cc=anshuman.khandual@arm.com \
--cc=ard.biesheuvel@linaro.org \
--cc=broonie@kernel.org \
--cc=dan.j.williams@intel.com \
--cc=dave.hansen@intel.com \
--cc=davem@davemloft.net \
--cc=gerald.schaefer@de.ibm.com \
--cc=gregkh@linuxfoundation.org \
--cc=heiko.carstens@de.ibm.com \
--cc=jgg@ziepe.ca \
--cc=jhogan@kernel.org \
--cc=keescook@chromium.org \
--cc=kirill@shutemov.name \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-ia64@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-s390@vger.kernel.org \
--cc=linux-sh@vger.kernel.org \
--cc=linux-snps-arc@lists.infradead.org \
--cc=linux@armlinux.org.uk \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mark.rutland@arm.com \
--cc=mhocko@kernel.org \
--cc=mingo@kernel.org \
--cc=paul.burton@mips.com \
--cc=paulus@samba.org \
--cc=penguin-kernel@i-love.sakura.ne.jp \
--cc=peterz@infradead.org \
--cc=ralf@linux-mips.org \
--cc=rppt@linux.vnet.ibm.com \
--cc=schowdary@nvidia.com \
--cc=schwidefsky@de.ibm.com \
--cc=sparclinux@vger.kernel.org \
--cc=tglx@linutronix.de \
--cc=vbabka@suse.cz \
--cc=willy@infradead.org \
--cc=x86@kernel.org \
--cc=yamada.masahiro@socionext.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).