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Date: Fri, 13 Sep 2013 15:19:07 +0200 From: Peter Zijlstra <peterz@...radead.org> To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> Cc: Alex Thorlton <athorlton@....com>, Ingo Molnar <mingo@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>, Naoya Horiguchi <n-horiguchi@...jp.nec.com>, "Eric W . Biederman" <ebiederm@...ssion.com>, "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>, Al Viro <viro@...iv.linux.org.uk>, Andi Kleen <ak@...ux.intel.com>, Andrea Arcangeli <aarcange@...hat.com>, Dave Hansen <dave.hansen@...el.com>, Dave Jones <davej@...hat.com>, David Howells <dhowells@...hat.com>, Frederic Weisbecker <fweisbec@...il.com>, Johannes Weiner <hannes@...xchg.org>, Kees Cook <keescook@...omium.org>, Mel Gorman <mgorman@...e.de>, Michael Kerrisk <mtk.manpages@...il.com>, Oleg Nesterov <oleg@...hat.com>, Rik van Riel <riel@...hat.com>, Robin Holt <robinmholt@...il.com>, Sedat Dilek <sedat.dilek@...il.com>, Srikar Dronamraju <srikar@...ux.vnet.ibm.com>, Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: Re: [PATCH 3/9] mm: introduce api for split page table lock for PMD level On Fri, Sep 13, 2013 at 04:06:10PM +0300, Kirill A. Shutemov wrote: > Basic api, backed by mm->page_table_lock for now. Actual implementation > will be added later. > > Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com> > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com> > --- > include/linux/mm.h | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index 6cf8ddb..d4361e7 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -1294,6 +1294,19 @@ static inline void pgtable_page_dtor(struct page *page) > ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ > NULL: pte_offset_kernel(pmd, address)) > > +static inline spinlock_t *huge_pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) > +{ > + return &mm->page_table_lock; > +} > + > + > +static inline spinlock_t *huge_pmd_lock(struct mm_struct *mm, pmd_t *pmd) > +{ > + spinlock_t *ptl = huge_pmd_lockptr(mm, pmd); > + spin_lock(ptl); > + return ptl; > +} Why not call the thing pmd_lock()? The pmd bit differentiates it from pte_lock() enough IMIO. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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