From: Will Deacon <will.deacon@arm.com>
To: Michal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Hillf Danton <dhillf@gmail.com>,
Russell King <linux@arm.linux.org.uk>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: [PATCH] mm: hugetlb: flush dcache before returning zeroed huge page to userspace
Date: Thu, 16 Aug 2012 19:32:56 +0100 [thread overview]
Message-ID: <20120816183255.GB19401@mudshark.cambridge.arm.com> (raw)
In-Reply-To: <20120816182015.GC12578@dhcp22.suse.cz>
On Thu, Aug 16, 2012 at 07:20:15PM +0100, Michal Hocko wrote:
> On Thu 16-08-12 17:09:54, Will Deacon wrote:
> > +static inline void arch_clear_hugepage_flags(struct page *page)
> > +{
> > + flush_dcache_page(page);
> > +}
> > +
>
> Why do we need the hook for ia64? hugetlb_no_page calls clear_huge_page
> and that one calls flush_dcache_page (via clear_user_page), right?
> The same applies to copy_huge_page for COW.
You're right, these are redundant for ppc and ia64 (although ppc does have a
comment moaning about the flush). Looks like it's just sh and ARM that need to
do anything.
Cheers,
Will
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WARNING: multiple messages have this Message-ID (diff)
From: Will Deacon <will.deacon@arm.com>
To: Michal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Hillf Danton <dhillf@gmail.com>,
Russell King <linux@arm.linux.org.uk>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: [PATCH] mm: hugetlb: flush dcache before returning zeroed huge page to userspace
Date: Thu, 16 Aug 2012 19:32:56 +0100 [thread overview]
Message-ID: <20120816183255.GB19401@mudshark.cambridge.arm.com> (raw)
Message-ID: <20120816183256.VHOZ8IRxsOtUk2Dgae-sKk6camv2FnwXX9gvTN4CAIo@z> (raw)
In-Reply-To: <20120816182015.GC12578@dhcp22.suse.cz>
On Thu, Aug 16, 2012 at 07:20:15PM +0100, Michal Hocko wrote:
> On Thu 16-08-12 17:09:54, Will Deacon wrote:
> > +static inline void arch_clear_hugepage_flags(struct page *page)
> > +{
> > + flush_dcache_page(page);
> > +}
> > +
>
> Why do we need the hook for ia64? hugetlb_no_page calls clear_huge_page
> and that one calls flush_dcache_page (via clear_user_page), right?
> The same applies to copy_huge_page for COW.
You're right, these are redundant for ppc and ia64 (although ppc does have a
comment moaning about the flush). Looks like it's just sh and ARM that need to
do anything.
Cheers,
Will
next prev parent reply other threads:[~2012-08-16 18:32 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1341412376-6272-1-git-send-email-will.deacon@arm.com>
[not found] ` <20120709122523.GC4627@tiehlicka.suse.cz>
[not found] ` <20120709141324.GK7315@mudshark.cambridge.arm.com>
2012-07-09 23:57 ` [PATCH] mm: hugetlb: flush dcache before returning zeroed huge page to userspace Hugh Dickins
2012-07-10 9:45 ` Will Deacon
2012-07-10 9:45 ` Will Deacon
2012-07-10 10:42 ` Will Deacon
2012-07-10 10:42 ` Will Deacon
2012-07-11 17:48 ` Will Deacon
2012-07-11 17:48 ` Will Deacon
2012-07-12 11:16 ` Michal Hocko
2012-07-12 11:16 ` Michal Hocko
2012-07-12 11:26 ` James Bottomley
2012-07-12 11:26 ` Will Deacon
2012-07-12 11:26 ` Will Deacon
2012-07-12 11:57 ` Michal Hocko
2012-07-12 11:57 ` Michal Hocko
2012-08-07 16:03 ` Will Deacon
2012-08-07 16:03 ` Will Deacon
2012-08-08 16:26 ` Michal Hocko
2012-08-08 16:26 ` Michal Hocko
2012-08-16 16:09 ` Will Deacon
2012-08-16 16:09 ` Will Deacon
2012-08-16 17:25 ` Michal Hocko
2012-08-16 17:25 ` Michal Hocko
2012-08-16 17:34 ` Will Deacon
2012-08-16 17:34 ` Will Deacon
2012-08-16 18:06 ` Michal Hocko
2012-08-16 18:19 ` Will Deacon
2012-08-16 18:20 ` Michal Hocko
2012-08-16 18:32 ` Will Deacon [this message]
2012-08-16 18:32 ` Will Deacon
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