From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl0-f70.google.com (mail-pl0-f70.google.com [209.85.160.70]) by kanga.kvack.org (Postfix) with ESMTP id 2CC606B0011 for ; Sat, 24 Mar 2018 08:25:58 -0400 (EDT) Received: by mail-pl0-f70.google.com with SMTP id 69-v6so9356901plc.18 for ; Sat, 24 Mar 2018 05:25:58 -0700 (PDT) Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65]) by mx.google.com with SMTPS id p14sor700479pfh.44.2018.03.24.05.25.57 for (Google Transport Security); Sat, 24 Mar 2018 05:25:57 -0700 (PDT) From: Jia He Subject: [PATCH v2 4/5] arm64: introduce pfn_valid_region() Date: Sat, 24 Mar 2018 05:24:41 -0700 Message-Id: <1521894282-6454-5-git-send-email-hejianet@gmail.com> In-Reply-To: <1521894282-6454-1-git-send-email-hejianet@gmail.com> References: <1521894282-6454-1-git-send-email-hejianet@gmail.com> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton , Michal Hocko , Catalin Marinas , Mel Gorman , Will Deacon , Mark Rutland , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Cc: Pavel Tatashin , Daniel Jordan , AKASHI Takahiro , Gioh Kim , Steven Sistare , Daniel Vacek , Eugeniu Rosca , Vlastimil Babka , linux-kernel@vger.kernel.org, linux-mm@kvack.org, James Morse , Ard Biesheuvel , Steve Capper , x86@kernel.org, Greg Kroah-Hartman , Kate Stewart , Philippe Ombredanne , Johannes Weiner , Kemi Wang , Petr Tesarik , YASUAKI ISHIMATSU , Andrey Ryabinin , Nikolay Borisov , Jia He , Jia He This is the preparation for further optimizing in early_pfn_valid on arm64. Signed-off-by: Jia He --- arch/arm64/include/asm/page.h | 3 ++- arch/arm64/mm/init.c | 25 ++++++++++++++++++++++++- 2 files changed, 26 insertions(+), 2 deletions(-) diff --git a/arch/arm64/include/asm/page.h b/arch/arm64/include/asm/page.h index 60d02c8..da2cba3 100644 --- a/arch/arm64/include/asm/page.h +++ b/arch/arm64/include/asm/page.h @@ -38,7 +38,8 @@ extern void clear_page(void *to); typedef struct page *pgtable_t; #ifdef CONFIG_HAVE_ARCH_PFN_VALID -extern int pfn_valid(unsigned long); +extern int pfn_valid(unsigned long pfn); +extern int pfn_valid_region(unsigned long pfn, int *last_idx); #endif #include diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 00e7b90..9122102 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -290,7 +290,30 @@ int pfn_valid(unsigned long pfn) return memblock_is_map_memory(pfn << PAGE_SHIFT); } EXPORT_SYMBOL(pfn_valid); -#endif + +int pfn_valid_region(unsigned long pfn, int *last_idx) +{ + unsigned long start_pfn, end_pfn; + struct memblock_type *type = &memblock.memory; + + if (*last_idx != -1) { + start_pfn = PFN_DOWN(type->regions[*last_idx].base); + end_pfn= PFN_DOWN(type->regions[*last_idx].base + + type->regions[*last_idx].size); + + if (pfn >= start_pfn && end_pfn < end_pfn) + return !memblock_is_nomap( + &memblock.memory.regions[*last_idx]); + } + + *last_idx = memblock_search_pfn_regions(pfn); + if (*last_idx == -1) + return false; + + return !memblock_is_nomap(&memblock.memory.regions[*last_idx]); +} +EXPORT_SYMBOL(pfn_valid_region); +#endif /*CONFIG_HAVE_ARCH_PFN_VALID*/ #ifndef CONFIG_SPARSEMEM static void __init arm64_memory_present(void) -- 2.7.4