From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Andrew Morton <akpm@linux-foundation.org>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Mel Gorman <mgorman@suse.de>,
Matthew Wilcox <matthew.r.wilcox@intel.com>,
Minchan Kim <minchan@kernel.org>,
linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH v2 09/12] mm,thp: reduce ifdef'ery for THP in generic code
Date: Fri, 9 Oct 2015 15:58:11 +0530 [thread overview]
Message-ID: <561796BB.8040905@synopsys.com> (raw)
In-Reply-To: <20151009095359.GA7971@node>
On Friday 09 October 2015 03:23 PM, Kirill A. Shutemov wrote:
> On Tue, Sep 22, 2015 at 04:04:53PM +0530, Vineet Gupta wrote:
>> > - pgtable-generic.c: Fold individual #ifdef for each helper into a top
>> > level #ifdef. Makes code more readable
> Makes sense.
>
>> > - Per Andrew's suggestion removed the dummy implementations for !THP
>> > in asm-generic/page-table.h to have build time failures vs. runtime.
> I'm not sure it's a good idea. This can lead to unnecessary #ifdefs where
> otherwise call to helper would be eliminated by compiler as dead code.
>
> What about dummy helpers with BUILD_BUG()?
>
You are right after all. It is not so much related to __HAVE_ARCH_PMDP_xyz, but
the fact that generic code can call them under PageTransHuge(). So better to
provide stubs with BUILD_BUG
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next prev parent reply other threads:[~2015-10-09 10:28 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-22 10:34 [PATCH v2 00/12] THP support for ARC Vineet Gupta
2015-09-22 10:34 ` [PATCH v2 01/12] ARC: mm: switch pgtable_to to pte_t * Vineet Gupta
2015-09-22 10:34 ` [PATCH v2 02/12] ARC: mm: pte flags comsetic cleanups, comments Vineet Gupta
2015-09-22 10:34 ` [PATCH v2 03/12] ARC: mm: Introduce PTE_SPECIAL Vineet Gupta
2015-09-22 10:34 ` [PATCH v2 04/12] Documentation/features/vm: pte_special now supported by ARC Vineet Gupta
2015-09-22 10:34 ` [PATCH v2 05/12] ARCv2: mm: THP support Vineet Gupta
2015-09-22 10:34 ` [PATCH v2 06/12] ARCv2: mm: THP: boot validation/reporting Vineet Gupta
2015-09-22 10:34 ` [PATCH v2 07/12] Documentation/features/vm: THP now supported by ARC Vineet Gupta
2015-09-22 10:34 ` [PATCH v2 08/12] mm: move some code around Vineet Gupta
2015-10-09 9:48 ` Kirill A. Shutemov
2015-10-09 10:01 ` Vineet Gupta
2015-09-22 10:34 ` [PATCH v2 09/12] mm,thp: reduce ifdef'ery for THP in generic code Vineet Gupta
2015-10-09 9:53 ` Kirill A. Shutemov
2015-10-09 10:10 ` Vineet Gupta
2015-10-09 10:28 ` Vineet Gupta [this message]
2015-09-22 10:34 ` [PATCH v2 10/12] mm,thp: introduce flush_pmd_tlb_range Vineet Gupta
2015-10-09 10:08 ` Kirill A. Shutemov
2015-10-09 10:54 ` Vineet Gupta
2015-09-22 10:34 ` [PATCH v2 11/12] ARCv2: mm: THP: Implement flush_pmd_tlb_range() optimization Vineet Gupta
2015-09-22 10:34 ` [PATCH v2 12/12] ARCv2: Add a DT which enables THP Vineet Gupta
2015-10-01 6:02 ` [PATCH v2 00/12] THP support for ARC Vineet Gupta
2015-10-09 9:33 ` Vineet Gupta
2015-10-09 10:10 ` Kirill A. Shutemov
2015-10-09 11:29 ` Vineet Gupta
2015-10-09 11:43 ` Kirill A. Shutemov
2015-10-09 11:52 ` Vineet Gupta
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