From: akpm@linux-foundation.org (Andrew Morton)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/9] mm: alloc_contig_freed_pages() added
Date: Mon, 17 Oct 2011 11:39:19 -0700 [thread overview]
Message-ID: <20111017113919.3b7ac253.akpm@linux-foundation.org> (raw)
In-Reply-To: <01b201cc8cc7$3f6117d0$be234770$%szyprowski@samsung.com>
On Mon, 17 Oct 2011 14:21:07 +0200
Marek Szyprowski <m.szyprowski@samsung.com> wrote:
> > > +
> > > +void free_contig_pages(unsigned long pfn, unsigned nr_pages)
> > > +{
> > > + struct page *page = pfn_to_page(pfn);
> > > +
> > > + while (nr_pages--) {
> > > + __free_page(page);
> > > + ++pfn;
> > > + if (likely(zone_pfn_same_memmap(pfn - 1, pfn)))
> > > + ++page;
> > > + else
> > > + page = pfn_to_page(pfn);
> > > + }
> > > +}
> >
> > You're sure these functions don't need EXPORT_SYMBOL()? Maybe the
> > design is that only DMA core calls into here (if so, that's good).
>
> Drivers should not call it, it is intended to be used by low-level DMA
> code.
OK, thanks for checking.
> Do you think that a comment about missing EXPORT_SYMBOL is
> required?
No. If someone later wants to use these from a module then we can look
at their reasons and make a decision at that time.
WARNING: multiple messages have this Message-ID (diff)
From: Andrew Morton <akpm@linux-foundation.org>
To: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-media@vger.kernel.org, linux-mm@kvack.org,
linaro-mm-sig@lists.linaro.org,
"'Michal Nazarewicz'" <mina86@mina86.com>,
"'Kyungmin Park'" <kyungmin.park@samsung.com>,
"'Russell King'" <linux@arm.linux.org.uk>,
"'KAMEZAWA Hiroyuki'" <kamezawa.hiroyu@jp.fujitsu.com>,
"'Ankita Garg'" <ankita@in.ibm.com>,
"'Daniel Walker'" <dwalker@codeaurora.org>,
"'Mel Gorman'" <mel@csn.ul.ie>, "'Arnd Bergmann'" <arnd@arndb.de>,
"'Jesse Barker'" <jesse.barker@linaro.org>,
"'Jonathan Corbet'" <corbet@lwn.net>,
"'Shariq Hasnain'" <shariq.hasnain@linaro.org>,
"'Chunsang Jeong'" <chunsang.jeong@linaro.org>,
"'Dave Hansen'" <dave@linux.vnet.ibm.com>
Subject: Re: [PATCH 2/9] mm: alloc_contig_freed_pages() added
Date: Mon, 17 Oct 2011 11:39:19 -0700 [thread overview]
Message-ID: <20111017113919.3b7ac253.akpm@linux-foundation.org> (raw)
In-Reply-To: <01b201cc8cc7$3f6117d0$be234770$%szyprowski@samsung.com>
On Mon, 17 Oct 2011 14:21:07 +0200
Marek Szyprowski <m.szyprowski@samsung.com> wrote:
> > > +
> > > +void free_contig_pages(unsigned long pfn, unsigned nr_pages)
> > > +{
> > > + struct page *page = pfn_to_page(pfn);
> > > +
> > > + while (nr_pages--) {
> > > + __free_page(page);
> > > + ++pfn;
> > > + if (likely(zone_pfn_same_memmap(pfn - 1, pfn)))
> > > + ++page;
> > > + else
> > > + page = pfn_to_page(pfn);
> > > + }
> > > +}
> >
> > You're sure these functions don't need EXPORT_SYMBOL()? Maybe the
> > design is that only DMA core calls into here (if so, that's good).
>
> Drivers should not call it, it is intended to be used by low-level DMA
> code.
OK, thanks for checking.
> Do you think that a comment about missing EXPORT_SYMBOL is
> required?
No. If someone later wants to use these from a module then we can look
at their reasons and make a decision at that time.
WARNING: multiple messages have this Message-ID (diff)
From: Andrew Morton <akpm@linux-foundation.org>
To: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-media@vger.kernel.org, linux-mm@kvack.org,
linaro-mm-sig@lists.linaro.org,
'Michal Nazarewicz' <mina86@mina86.com>,
'Kyungmin Park' <kyungmin.park@samsung.com>,
'Russell King' <linux@arm.linux.org.uk>,
'KAMEZAWA Hiroyuki' <kamezawa.hiroyu@jp.fujitsu.com>,
'Ankita Garg' <ankita@in.ibm.com>,
'Daniel Walker' <dwalker@codeaurora.org>,
'Mel Gorman' <mel@csn.ul.ie>, 'Arnd Bergmann' <arnd@arndb.de>,
'Jesse Barker' <jesse.barker@linaro.org>,
'Jonathan Corbet' <corbet@lwn.net>,
'Shariq Hasnain' <shariq.hasnain@linaro.org>,
'Chunsang Jeong' <chunsang.jeong@linaro.org>,
'Dave Hansen' <dave@linux.vnet.ibm.com>
Subject: Re: [PATCH 2/9] mm: alloc_contig_freed_pages() added
Date: Mon, 17 Oct 2011 11:39:19 -0700 [thread overview]
Message-ID: <20111017113919.3b7ac253.akpm@linux-foundation.org> (raw)
In-Reply-To: <01b201cc8cc7$3f6117d0$be234770$%szyprowski@samsung.com>
On Mon, 17 Oct 2011 14:21:07 +0200
Marek Szyprowski <m.szyprowski@samsung.com> wrote:
> > > +
> > > +void free_contig_pages(unsigned long pfn, unsigned nr_pages)
> > > +{
> > > + struct page *page = pfn_to_page(pfn);
> > > +
> > > + while (nr_pages--) {
> > > + __free_page(page);
> > > + ++pfn;
> > > + if (likely(zone_pfn_same_memmap(pfn - 1, pfn)))
> > > + ++page;
> > > + else
> > > + page = pfn_to_page(pfn);
> > > + }
> > > +}
> >
> > You're sure these functions don't need EXPORT_SYMBOL()? Maybe the
> > design is that only DMA core calls into here (if so, that's good).
>
> Drivers should not call it, it is intended to be used by low-level DMA
> code.
OK, thanks for checking.
> Do you think that a comment about missing EXPORT_SYMBOL is
> required?
No. If someone later wants to use these from a module then we can look
at their reasons and make a decision at that time.
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next prev parent reply other threads:[~2011-10-17 18:39 UTC|newest]
Thread overview: 182+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-06 13:54 [PATCHv16 0/9] Contiguous Memory Allocator Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-06 13:54 ` [PATCH 1/9] mm: move some functions from memory_hotplug.c to page_isolation.c Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-14 23:23 ` Andrew Morton
2011-10-14 23:23 ` Andrew Morton
2011-10-14 23:23 ` Andrew Morton
2011-10-18 12:05 ` Mel Gorman
2011-10-18 12:05 ` Mel Gorman
2011-10-18 12:05 ` Mel Gorman
2011-10-06 13:54 ` [PATCH 2/9] mm: alloc_contig_freed_pages() added Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-14 23:29 ` Andrew Morton
2011-10-14 23:29 ` Andrew Morton
2011-10-14 23:29 ` Andrew Morton
2011-10-16 8:01 ` Michal Nazarewicz
2011-10-16 8:01 ` Michal Nazarewicz
2011-10-16 8:01 ` Michal Nazarewicz
2011-10-16 8:31 ` Andrew Morton
2011-10-16 8:31 ` Andrew Morton
2011-10-16 8:31 ` Andrew Morton
2011-10-16 9:39 ` Michal Nazarewicz
2011-10-16 9:39 ` Michal Nazarewicz
2011-10-16 9:39 ` Michal Nazarewicz
2011-10-17 12:21 ` Marek Szyprowski
2011-10-17 12:21 ` Marek Szyprowski
2011-10-17 12:21 ` Marek Szyprowski
2011-10-17 18:39 ` Andrew Morton [this message]
2011-10-17 18:39 ` Andrew Morton
2011-10-17 18:39 ` Andrew Morton
2011-10-18 12:21 ` Mel Gorman
2011-10-18 12:21 ` Mel Gorman
2011-10-18 12:21 ` Mel Gorman
2011-10-18 17:26 ` Michal Nazarewicz
2011-10-18 17:26 ` Michal Nazarewicz
2011-10-18 17:26 ` Michal Nazarewicz
2011-10-18 17:48 ` Dave Hansen
2011-10-18 17:48 ` Dave Hansen
2011-10-18 17:48 ` Dave Hansen
2011-10-18 18:00 ` Michal Nazarewicz
2011-10-18 18:00 ` Michal Nazarewicz
2011-10-18 18:00 ` Michal Nazarewicz
2011-10-21 10:06 ` Mel Gorman
2011-10-21 10:06 ` Mel Gorman
2011-10-21 10:06 ` Mel Gorman
2011-10-24 1:00 ` Michal Nazarewicz
2011-10-24 1:00 ` Michal Nazarewicz
2011-10-24 1:00 ` Michal Nazarewicz
2011-10-24 4:05 ` Michal Nazarewicz
2011-10-24 4:05 ` Michal Nazarewicz
2011-10-24 4:05 ` Michal Nazarewicz
2011-10-24 4:05 ` Michal Nazarewicz
2011-11-01 15:04 ` Mel Gorman
2011-11-01 15:04 ` Mel Gorman
2011-11-01 15:04 ` Mel Gorman
2011-11-01 18:06 ` Michal Nazarewicz
2011-11-01 18:06 ` Michal Nazarewicz
2011-11-01 18:06 ` Michal Nazarewicz
2011-11-01 18:47 ` Mel Gorman
2011-11-01 18:47 ` Mel Gorman
2011-11-01 18:47 ` Mel Gorman
2011-10-24 4:05 ` Michal Nazarewicz
2011-10-24 4:05 ` Michal Nazarewicz
2011-10-06 13:54 ` [PATCH 3/9] mm: alloc_contig_range() added Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-14 23:35 ` Andrew Morton
2011-10-14 23:35 ` Andrew Morton
2011-10-14 23:35 ` Andrew Morton
2011-10-18 12:38 ` Mel Gorman
2011-10-18 12:38 ` Mel Gorman
2011-10-18 12:38 ` Mel Gorman
2011-10-06 13:54 ` [PATCH 4/9] mm: MIGRATE_CMA migration type added Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-14 23:38 ` Andrew Morton
2011-10-14 23:38 ` Andrew Morton
2011-10-14 23:38 ` Andrew Morton
2011-10-18 13:08 ` Mel Gorman
2011-10-18 13:08 ` Mel Gorman
2011-10-18 13:08 ` Mel Gorman
2011-10-24 19:32 ` Michal Nazarewicz
2011-10-24 19:32 ` Michal Nazarewicz
2011-10-24 19:32 ` Michal Nazarewicz
2011-10-27 9:10 ` Michal Nazarewicz
2011-10-27 9:10 ` Michal Nazarewicz
2011-10-27 9:10 ` Michal Nazarewicz
2011-10-06 13:54 ` [PATCH 5/9] mm: MIGRATE_CMA isolation functions added Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-06 13:54 ` [PATCH 6/9] drivers: add Contiguous Memory Allocator Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-14 23:57 ` Andrew Morton
2011-10-14 23:57 ` Andrew Morton
2011-10-14 23:57 ` Andrew Morton
2011-10-16 10:08 ` Russell King - ARM Linux
2011-10-16 10:08 ` Russell King - ARM Linux
2011-10-16 10:08 ` Russell King - ARM Linux
2011-10-18 13:43 ` Mel Gorman
2011-10-18 13:43 ` Mel Gorman
2011-10-18 13:43 ` Mel Gorman
2011-10-24 19:39 ` Michal Nazarewicz
2011-10-24 19:39 ` Michal Nazarewicz
2011-10-24 19:39 ` Michal Nazarewicz
2011-11-04 10:41 ` Marek Szyprowski
2011-11-04 10:41 ` Marek Szyprowski
2011-11-04 10:41 ` Marek Szyprowski
2011-10-06 13:54 ` [PATCH 7/7] ARM: integrate CMA with DMA-mapping subsystem Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-06 14:18 ` Marek Szyprowski
2011-10-06 14:18 ` Marek Szyprowski
2011-10-06 14:18 ` Marek Szyprowski
2011-10-15 0:03 ` Andrew Morton
2011-10-15 0:03 ` Andrew Morton
2011-10-15 0:03 ` Andrew Morton
2011-10-06 13:54 ` [PATCH 7/9] X86: " Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-06 13:54 ` [PATCH 8/9] ARM: " Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-14 4:33 ` [Linaro-mm-sig] " Subash Patel
2011-10-14 4:33 ` Subash Patel
2011-10-14 4:33 ` Subash Patel
2011-10-14 9:14 ` Marek Szyprowski
2011-10-14 9:14 ` Marek Szyprowski
2011-10-14 9:14 ` Marek Szyprowski
2011-10-06 13:54 ` [PATCH 9/9] ARM: Samsung: use CMA for 2 memory banks for s5p-mfc device Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-06 13:54 ` Marek Szyprowski
2011-10-07 16:27 ` [PATCHv16 0/9] Contiguous Memory Allocator Arnd Bergmann
2011-10-07 16:27 ` Arnd Bergmann
2011-10-07 16:27 ` Arnd Bergmann
2011-10-10 6:58 ` [Linaro-mm-sig] " Ohad Ben-Cohen
2011-10-10 6:58 ` Ohad Ben-Cohen
2011-10-10 6:58 ` Ohad Ben-Cohen
2011-10-10 12:02 ` Clark, Rob
2011-10-10 12:02 ` Clark, Rob
2011-10-10 12:02 ` Clark, Rob
2011-10-10 22:56 ` Andrew Morton
2011-10-10 22:56 ` Andrew Morton
2011-10-10 22:56 ` Andrew Morton
2011-10-11 6:57 ` Marek Szyprowski
2011-10-11 6:57 ` Marek Szyprowski
2011-10-11 6:57 ` Marek Szyprowski
2011-10-11 13:52 ` Arnd Bergmann
2011-10-11 13:52 ` Arnd Bergmann
2011-10-11 13:52 ` Arnd Bergmann
2011-10-14 23:19 ` Andrew Morton
2011-10-14 23:19 ` Andrew Morton
2011-10-14 23:19 ` Andrew Morton
2011-10-15 14:24 ` Arnd Bergmann
2011-10-15 14:24 ` Arnd Bergmann
2011-10-15 14:24 ` Arnd Bergmann
2011-10-10 12:07 ` [Linaro-mm-sig] " Maxime Coquelin
2011-10-10 12:07 ` Maxime Coquelin
2011-10-10 12:07 ` Maxime Coquelin
2011-10-11 7:17 ` Marek Szyprowski
2011-10-11 7:17 ` Marek Szyprowski
2011-10-11 7:17 ` Marek Szyprowski
2011-10-11 7:30 ` Maxime Coquelin
2011-10-11 7:30 ` Maxime Coquelin
2011-10-11 10:50 ` Marek Szyprowski
2011-10-11 10:50 ` Marek Szyprowski
2011-10-11 10:50 ` Marek Szyprowski
2011-10-11 11:25 ` Maxime Coquelin
2011-10-11 11:25 ` Maxime Coquelin
2011-10-11 13:05 ` Marek Szyprowski
2011-10-11 13:05 ` Marek Szyprowski
2011-10-11 13:05 ` Marek Szyprowski
2011-10-12 11:08 ` [PATCH] fixup: mm: alloc_contig_range: increase min_free_kbytes during allocation Marek Szyprowski
2011-10-12 11:08 ` Marek Szyprowski
2011-10-12 13:01 ` Maxime Coquelin
2011-10-12 13:01 ` Maxime Coquelin
-- strict thread matches above, loose matches on Subject: below --
2011-08-12 10:58 [PATCHv14 0/9] Contiguous Memory Allocator Marek Szyprowski
2011-08-12 10:58 ` [PATCH 2/9] mm: alloc_contig_freed_pages() added Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
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