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From: Mike Rapoport <rppt@linux.ibm.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
	Christoph Hellwig <hch@lst.de>,
	"David S. Miller" <davem@davemloft.net>,
	Dennis Zhou <dennis@kernel.org>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Greentime Hu <green.hu@gmail.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Guan Xuetao <gxt@pku.edu.cn>, Guo Ren <guoren@kernel.org>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Mark Salter <msalter@redhat.com>,
	Matt Turner <mattst88@gmail.com>,
	Max Filippov <jcmvbkbc@gmail.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Michal Simek <monstr@monstr.eu>,
	Paul Burton <paul.burton@mips.com>,
	Petr Mladek <pmladek@suse.com>, Rich Felker <dalias@libc.org>,
	Richard Weinberger <richard@nod.at>,
	Rob Herring <robh+dt@kernel.org>,
	Russell King <linux@armlinux.org.uk>,
	Stafford Horne <shorne@gmail.com>,
	Tony Luck <tony.luck@intel.com>,
	Vineet Gupta <vgupta@synopsys.com>,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
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Subject: Re: [PATCH v2 06/21] memblock: memblock_phys_alloc_try_nid(): don't panic
Date: Fri, 25 Jan 2019 21:32:52 +0200	[thread overview]
Message-ID: <20190125193252.GH31519@rapoport-lnx> (raw)
In-Reply-To: <20190125174502.GL25901@arrakis.emea.arm.com>

On Fri, Jan 25, 2019 at 05:45:02PM +0000, Catalin Marinas wrote:
> On Mon, Jan 21, 2019 at 10:03:53AM +0200, Mike Rapoport wrote:
> > diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
> > index ae34e3a..2c61ea4 100644
> > --- a/arch/arm64/mm/numa.c
> > +++ b/arch/arm64/mm/numa.c
> > @@ -237,6 +237,10 @@ static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
> >  		pr_info("Initmem setup node %d [<memory-less node>]\n", nid);
> >  
> >  	nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
> > +	if (!nd_pa)
> > +		panic("Cannot allocate %zu bytes for node %d data\n",
> > +		      nd_size, nid);
> > +
> >  	nd = __va(nd_pa);
> >  
> >  	/* report and initialize */
> 
> Does it mean that memblock_phys_alloc_try_nid() never returns valid
> physical memory starting at 0?

Yes, it does.
memblock_find_in_range_node() that is used by all allocation methods
skips the first page [1].
 
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/mm/memblock.c#n257

> -- 
> Catalin
> 

-- 
Sincerely yours,
Mike.


  reply	other threads:[~2019-01-25 19:33 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-21  8:03 [PATCH v2 00/21] Refine memblock API Mike Rapoport
2019-01-21  8:03 ` [PATCH v2 01/21] openrisc: prefer memblock APIs returning virtual address Mike Rapoport
2019-01-27  3:07   ` Stafford Horne
2019-01-21  8:03 ` [PATCH v2 02/21] powerpc: use memblock functions " Mike Rapoport
2019-01-29  9:52   ` Michael Ellerman
2019-01-21  8:03 ` [PATCH v2 03/21] memblock: replace memblock_alloc_base(ANYWHERE) with memblock_phys_alloc Mike Rapoport
2019-01-21  8:03 ` [PATCH v2 04/21] memblock: drop memblock_alloc_base_nid() Mike Rapoport
2019-01-21  8:03 ` [PATCH v2 05/21] memblock: emphasize that memblock_alloc_range() returns a physical address Mike Rapoport
2019-01-21  8:03 ` [PATCH v2 06/21] memblock: memblock_phys_alloc_try_nid(): don't panic Mike Rapoport
2019-01-25 17:45   ` Catalin Marinas
2019-01-25 19:32     ` Mike Rapoport [this message]
2019-01-29  9:56   ` Michael Ellerman
2019-01-29  9:58     ` Michael Ellerman
2019-01-21  8:03 ` [PATCH v2 07/21] memblock: memblock_phys_alloc(): " Mike Rapoport
2019-01-21  8:03 ` [PATCH v2 08/21] memblock: drop __memblock_alloc_base() Mike Rapoport
2019-01-21  8:03 ` [PATCH v2 09/21] memblock: drop memblock_alloc_base() Mike Rapoport
2019-01-29 10:29   ` Michael Ellerman
2019-01-21  8:03 ` [PATCH v2 10/21] memblock: refactor internal allocation functions Mike Rapoport
2019-02-03  9:39   ` Michael Ellerman
2019-02-03 10:04     ` Mike Rapoport
2019-01-21  8:03 ` [PATCH v2 11/21] memblock: make memblock_find_in_range_node() and choose_memblock_flags() static Mike Rapoport
2019-01-21  8:03 ` [PATCH v2 12/21] arch: use memblock_alloc() instead of memblock_alloc_from(size, align, 0) Mike Rapoport
2019-01-21  8:04 ` [PATCH v2 13/21] arch: don't memset(0) memory returned by memblock_alloc() Mike Rapoport
2019-01-21  8:04 ` [PATCH v2 14/21] ia64: add checks for the return value of memblock_alloc*() Mike Rapoport
2019-01-21  8:04 ` [PATCH v2 15/21] sparc: " Mike Rapoport
2019-01-21  8:04 ` [PATCH v2 16/21] mm/percpu: " Mike Rapoport
2019-01-21  8:04 ` [PATCH v2 17/21] init/main: " Mike Rapoport
2019-01-21  8:04 ` [PATCH v2 18/21] swiotlb: " Mike Rapoport
2019-01-21  8:04 ` [PATCH v2 19/21] treewide: " Mike Rapoport
2019-01-21 17:18   ` Rob Herring
2019-01-31  6:07   ` Christophe Leroy
2019-01-31  6:41     ` Mike Rapoport
2019-01-31  6:44       ` Christophe Leroy
2019-01-31  7:07         ` Christophe Leroy
2019-01-31  7:14           ` Mike Rapoport
2019-01-21  8:04 ` [PATCH v2 20/21] memblock: memblock_alloc_try_nid: don't panic Mike Rapoport
2019-01-21  8:04 ` [PATCH v2 21/21] memblock: drop memblock_alloc_*_nopanic() variants Mike Rapoport
2019-01-30 13:38   ` Petr Mladek
2019-09-24 17:52 ` [PATCH v2 00/21] Refine memblock API Adam Ford

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