Re: [PATCH AUTOSEL 5.0 015/262] memblock: memblock_phys_alloc_try_nid(): don't panic

[Mike Rapoport <rppt@linux.ibm.com>]

Hi,

On Wed, Mar 27, 2019 at 01:57:50PM -0400, Sasha Levin wrote:
> From: Mike Rapoport <rppt@linux.ibm.com>
> 
> [ Upstream commit 337555744e6e39dd1d87698c6084dd88a606d60a ]
> 
> The memblock_phys_alloc_try_nid() function tries to allocate memory from
> the requested node and then falls back to allocation from any node in
> the system.  The memblock_alloc_base() fallback used by this function
> panics if the allocation fails.
> 
> Replace the memblock_alloc_base() fallback with the direct call to
> memblock_alloc_range_nid() and update the memblock_phys_alloc_try_nid()
> callers to check the returned value and panic in case of error.

This is a part of memblock refactoring, I don't think it should be applied
to -stable.
 
> Link: http://lkml.kernel.org/r/1548057848-15136-7-git-send-email-rppt@linux.ibm.com
> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> Acked-by: Michael Ellerman <mpe@ellerman.id.au>		[powerpc]
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Christophe Leroy <christophe.leroy@c-s.fr>
> Cc: Christoph Hellwig <hch@lst.de>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Dennis Zhou <dennis@kernel.org>
> Cc: Geert Uytterhoeven <geert@linux-m68k.org>
> Cc: Greentime Hu <green.hu@gmail.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Guan Xuetao <gxt@pku.edu.cn>
> Cc: Guo Ren <guoren@kernel.org>
> Cc: Guo Ren <ren_guo@c-sky.com>				[c-sky]
> Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
> Cc: Juergen Gross <jgross@suse.com>			[Xen]
> Cc: Mark Salter <msalter@redhat.com>
> Cc: Matt Turner <mattst88@gmail.com>
> Cc: Max Filippov <jcmvbkbc@gmail.com>
> Cc: Michal Simek <monstr@monstr.eu>
> Cc: Paul Burton <paul.burton@mips.com>
> Cc: Petr Mladek <pmladek@suse.com>
> Cc: Richard Weinberger <richard@nod.at>
> Cc: Rich Felker <dalias@libc.org>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Rob Herring <robh@kernel.org>
> Cc: Russell King <linux@armlinux.org.uk>
> Cc: Stafford Horne <shorne@gmail.com>
> Cc: Tony Luck <tony.luck@intel.com>
> Cc: Vineet Gupta <vgupta@synopsys.com>
> Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
>  arch/arm64/mm/numa.c   | 4 ++++
>  arch/powerpc/mm/numa.c | 4 ++++
>  mm/memblock.c          | 4 +++-
>  3 files changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
> index ae34e3a1cef1..2c61ea4e290b 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 */
> diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
> index 87f0dd004295..8ec2ed30d44c 100644
> --- a/arch/powerpc/mm/numa.c
> +++ b/arch/powerpc/mm/numa.c
> @@ -788,6 +788,10 @@ static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
>  	int tnid;
>  
>  	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 */
> diff --git a/mm/memblock.c b/mm/memblock.c
> index ea31045ba704..d5923df56acc 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -1342,7 +1342,9 @@ phys_addr_t __init memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t ali
>  
>  	if (res)
>  		return res;
> -	return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
> +	return memblock_alloc_range_nid(size, align, 0,
> +					MEMBLOCK_ALLOC_ACCESSIBLE,
> +					NUMA_NO_NODE, MEMBLOCK_NONE);
>  }
>  
>  /**
> -- 
> 2.19.1
> 

-- 
Sincerely yours,
Mike.