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Message-ID: <CAKv+Gu9x9bCvrHtXULtvk=bef3Yz0KsdQ8am7GuZj40cohodmQ@mail.gmail.com>
Date: Mon, 2 Apr 2018 08:59:03 +0200
From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
To: Jia He <hejianet@...il.com>
Cc: Russell King <linux@...linux.org.uk>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Mark Rutland <mark.rutland@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
Michal Hocko <mhocko@...e.com>,
Wei Yang <richard.weiyang@...il.com>,
Kees Cook <keescook@...omium.org>,
Laura Abbott <labbott@...hat.com>,
Vladimir Murzin <vladimir.murzin@....com>,
Philip Derrin <philip@....systems>,
Grygorii Strashko <grygorii.strashko@...aro.org>,
AKASHI Takahiro <takahiro.akashi@...aro.org>,
James Morse <james.morse@....com>,
Steve Capper <steve.capper@....com>,
Pavel Tatashin <pasha.tatashin@...cle.com>,
Gioh Kim <gi-oh.kim@...fitbricks.com>,
Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>,
Johannes Weiner <hannes@...xchg.org>,
Kemi Wang <kemi.wang@...el.com>,
Petr Tesarik <ptesarik@...e.com>,
YASUAKI ISHIMATSU <yasu.isimatu@...il.com>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Nikolay Borisov <nborisov@...e.com>,
Daniel Jordan <daniel.m.jordan@...cle.com>,
Daniel Vacek <neelx@...hat.com>,
Eugeniu Rosca <erosca@...adit-jv.com>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux-MM <linux-mm@...ck.org>, Jia He <jia.he@...-semitech.com>
Subject: Re: [PATCH v5 4/5] arm64: introduce pfn_valid_region()
On 2 April 2018 at 04:30, Jia He <hejianet@...il.com> wrote:
> This is the preparation for further optimizing in early_pfn_valid
> on arm and arm64.
>
Same as before
- please share the code between ARM and arm64. if necessary, you can
invent a new HAVE_ARCH_xxx symbol that is only defined by ARM and
arm64
- please explain what the patch does and more importantly, why
> Signed-off-by: Jia He <jia.he@...-semitech.com>
> ---
> arch/arm/include/asm/page.h | 3 ++-
> arch/arm/mm/init.c | 24 ++++++++++++++++++++++++
> arch/arm64/include/asm/page.h | 3 ++-
> arch/arm64/mm/init.c | 24 ++++++++++++++++++++++++
> 4 files changed, 52 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/include/asm/page.h b/arch/arm/include/asm/page.h
> index f38909c..3bd810e 100644
> --- a/arch/arm/include/asm/page.h
> +++ b/arch/arm/include/asm/page.h
> @@ -158,9 +158,10 @@ typedef struct page *pgtable_t;
>
> #ifdef CONFIG_HAVE_ARCH_PFN_VALID
> extern int early_region_idx;
> -extern int pfn_valid(unsigned long);
> +extern int pfn_valid(unsigned long pfn);
> extern unsigned long memblock_next_valid_pfn(unsigned long pfn);
> #define skip_to_last_invalid_pfn(pfn) (memblock_next_valid_pfn(pfn) - 1)
> +extern int pfn_valid_region(unsigned long pfn);
> #endif
>
> #include <asm/memory.h>
> diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
> index 06ed190..bdcbf58 100644
> --- a/arch/arm/mm/init.c
> +++ b/arch/arm/mm/init.c
> @@ -201,6 +201,30 @@ int pfn_valid(unsigned long pfn)
> }
> EXPORT_SYMBOL(pfn_valid);
>
> +int pfn_valid_region(unsigned long pfn)
> +{
> + unsigned long start_pfn, end_pfn;
> + struct memblock_type *type = &memblock.memory;
> + struct memblock_region *regions = type->regions;
> +
> + if (early_region_idx != -1) {
> + start_pfn = PFN_DOWN(regions[early_region_idx].base);
> + end_pfn = PFN_DOWN(regions[early_region_idx].base +
> + regions[early_region_idx].size);
> +
> + if (pfn >= start_pfn && pfn < end_pfn)
> + return !memblock_is_nomap(
> + ®ions[early_region_idx]);
> + }
> +
> + early_region_idx = memblock_search_pfn_regions(pfn);
> + if (early_region_idx == -1)
> + return false;
> +
> + return !memblock_is_nomap(®ions[early_region_idx]);
> +}
> +EXPORT_SYMBOL(pfn_valid_region);
> +
> /* HAVE_MEMBLOCK is always enabled on arm */
> unsigned long __init_memblock memblock_next_valid_pfn(unsigned long pfn)
> {
> diff --git a/arch/arm64/include/asm/page.h b/arch/arm64/include/asm/page.h
> index f0d8c8e5..7087b63 100644
> --- a/arch/arm64/include/asm/page.h
> +++ b/arch/arm64/include/asm/page.h
> @@ -39,9 +39,10 @@ typedef struct page *pgtable_t;
>
> #ifdef CONFIG_HAVE_ARCH_PFN_VALID
> extern int early_region_idx;
> -extern int pfn_valid(unsigned long);
> +extern int pfn_valid(unsigned long pfn);
> extern unsigned long memblock_next_valid_pfn(unsigned long pfn);
> #define skip_to_last_invalid_pfn(pfn) (memblock_next_valid_pfn(pfn) - 1)
> +extern int pfn_valid_region(unsigned long pfn);
> #endif
>
> #include <asm/memory.h>
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index 342e4e2..a1646b6 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -293,6 +293,30 @@ int pfn_valid(unsigned long pfn)
> }
> EXPORT_SYMBOL(pfn_valid);
>
> +int pfn_valid_region(unsigned long pfn)
> +{
> + unsigned long start_pfn, end_pfn;
> + struct memblock_type *type = &memblock.memory;
> + struct memblock_region *regions = type->regions;
> +
> + if (early_region_idx != -1) {
> + start_pfn = PFN_DOWN(regions[early_region_idx].base);
> + end_pfn = PFN_DOWN(regions[early_region_idx].base +
> + regions[early_region_idx].size);
> +
> + if (pfn >= start_pfn && pfn < end_pfn)
> + return !memblock_is_nomap(
> + ®ions[early_region_idx]);
> + }
> +
> + early_region_idx = memblock_search_pfn_regions(pfn);
> + if (early_region_idx == -1)
> + return false;
> +
> + return !memblock_is_nomap(®ions[early_region_idx]);
> +}
> +EXPORT_SYMBOL(pfn_valid_region);
> +
> /* HAVE_MEMBLOCK is always enabled on arm64 */
> unsigned long __init_memblock memblock_next_valid_pfn(unsigned long pfn)
> {
> --
> 2.7.4
>
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