linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Anshuman Khandual <anshuman.khandual@arm.com>
To: Mike Rapoport <rppt@kernel.org>, linux-arm-kernel@lists.infradead.org
Cc: Ard Biesheuvel <ardb@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	David Hildenbrand <david@redhat.com>,
	Marc Zyngier <maz@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Mike Rapoport <rppt@linux.ibm.com>, Will Deacon <will@kernel.org>,
	kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org
Subject: Re: [RFC/RFT PATCH 1/3] memblock: update initialization of reserved pages
Date: Thu, 8 Apr 2021 10:46:18 +0530	[thread overview]
Message-ID: <064dad68-ca9f-14d3-7859-5321001fbca4@arm.com> (raw)
In-Reply-To: <20210407172607.8812-2-rppt@kernel.org>



On 4/7/21 10:56 PM, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@linux.ibm.com>
> 
> The struct pages representing a reserved memory region are initialized
> using reserve_bootmem_range() function. This function is called for each
> reserved region just before the memory is freed from memblock to the buddy
> page allocator.
> 
> The struct pages for MEMBLOCK_NOMAP regions are kept with the default
> values set by the memory map initialization which makes it necessary to
> have a special treatment for such pages in pfn_valid() and
> pfn_valid_within().
> 
> Split out initialization of the reserved pages to a function with a
> meaningful name and treat the MEMBLOCK_NOMAP regions the same way as the
> reserved regions and mark struct pages for the NOMAP regions as
> PageReserved.

This would definitely need updating the comment for MEMBLOCK_NOMAP definition
in include/linux/memblock.h just to make the semantics is clear, though arm64
is currently the only user for MEMBLOCK_NOMAP.

> 
> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> ---
>  mm/memblock.c | 23 +++++++++++++++++++++--
>  1 file changed, 21 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/memblock.c b/mm/memblock.c
> index afaefa8fc6ab..6b7ea9d86310 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -2002,6 +2002,26 @@ static unsigned long __init __free_memory_core(phys_addr_t start,
>  	return end_pfn - start_pfn;
>  }
>  
> +static void __init memmap_init_reserved_pages(void)
> +{
> +	struct memblock_region *region;
> +	phys_addr_t start, end;
> +	u64 i;
> +
> +	/* initialize struct pages for the reserved regions */
> +	for_each_reserved_mem_range(i, &start, &end)
> +		reserve_bootmem_region(start, end);
> +
> +	/* and also treat struct pages for the NOMAP regions as PageReserved */
> +	for_each_mem_region(region) {
> +		if (memblock_is_nomap(region)) {
> +			start = region->base;
> +			end = start + region->size;
> +			reserve_bootmem_region(start, end);
> +		}
> +	}
> +}
> +
>  static unsigned long __init free_low_memory_core_early(void)
>  {
>  	unsigned long count = 0;
> @@ -2010,8 +2030,7 @@ static unsigned long __init free_low_memory_core_early(void)
>  
>  	memblock_clear_hotplug(0, -1);
>  
> -	for_each_reserved_mem_range(i, &start, &end)
> -		reserve_bootmem_region(start, end);
> +	memmap_init_reserved_pages();
>  
>  	/*
>  	 * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
> 

  reply	other threads:[~2021-04-08  5:15 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-07 17:26 [RFC/RFT PATCH 0/3] arm64: drop pfn_valid_within() and simplify pfn_valid() Mike Rapoport
2021-04-07 17:26 ` [RFC/RFT PATCH 1/3] memblock: update initialization of reserved pages Mike Rapoport
2021-04-08  5:16   ` Anshuman Khandual [this message]
2021-04-08  5:48     ` Mike Rapoport
2021-04-14 15:12   ` David Hildenbrand
2021-04-14 15:27     ` Ard Biesheuvel
2021-04-14 15:52       ` David Hildenbrand
2021-04-14 20:24         ` Mike Rapoport
2021-04-15  9:30           ` David Hildenbrand
2021-04-16 11:44             ` Mike Rapoport
2021-04-16 11:54               ` David Hildenbrand
2021-04-14 20:11       ` Mike Rapoport
2021-04-14 20:06     ` Mike Rapoport
2021-04-07 17:26 ` [RFC/RFT PATCH 2/3] arm64: decouple check whether pfn is normal memory from pfn_valid() Mike Rapoport
2021-04-08  5:14   ` Anshuman Khandual
2021-04-08  6:00     ` Mike Rapoport
2021-04-14 15:58     ` David Hildenbrand
2021-04-14 20:29       ` Mike Rapoport
2021-04-15  9:31         ` David Hildenbrand
2021-04-16 11:40           ` Mike Rapoport
2021-04-07 17:26 ` [RFC/RFT PATCH 3/3] arm64: drop pfn_valid_within() and simplify pfn_valid() Mike Rapoport
2021-04-08  5:12   ` Anshuman Khandual
2021-04-08  6:17     ` Mike Rapoport
2021-04-08  5:19 ` [RFC/RFT PATCH 0/3] " Anshuman Khandual
2021-04-08  6:27   ` Mike Rapoport

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=064dad68-ca9f-14d3-7859-5321001fbca4@arm.com \
    --to=anshuman.khandual@arm.com \
    --cc=ardb@kernel.org \
    --cc=catalin.marinas@arm.com \
    --cc=david@redhat.com \
    --cc=kvmarm@lists.cs.columbia.edu \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=mark.rutland@arm.com \
    --cc=maz@kernel.org \
    --cc=rppt@kernel.org \
    --cc=rppt@linux.ibm.com \
    --cc=will@kernel.org \
    --subject='Re: [RFC/RFT PATCH 1/3] memblock: update initialization of reserved pages' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).