From: Mike Rapoport <rppt@kernel.org> To: linux-kernel@vger.kernel.org Cc: Rich Felker <dalias@libc.org>, linux-ia64@vger.kernel.org, linux-doc@vger.kernel.org, Catalin Marinas <catalin.marinas@arm.com>, Heiko Carstens <heiko.carstens@de.ibm.com>, Michal Hocko <mhocko@kernel.org>, "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>, Max Filippov <jcmvbkbc@gmail.com>, Guo Ren <guoren@kernel.org>, linux-csky@vger.kernel.org, linux-parisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-riscv@lists.infradead.org, Mike Rapoport <rppt@linux.ibm.com>, Greg Ungerer <gerg@linux-m68k.org>, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, linux-c6x-dev@linux-c6x.org, Baoquan He <bhe@redhat.com>, Jonathan Corbet <corbet@lwn.net>, linux-sh@vger.kernel.org, Michael Ellerman <mpe@ellerman.id.au>, Helge Deller <deller@gmx.de>, x86@kernel.org, Russell King <linux@armlinux.org.uk>, Ley Foon Tan <ley.foon.tan@in> Subject: [PATCH 17/21] mm: free_area_init: allow defining max_zone_pfn in descending order Date: Sun, 12 Apr 2020 22:48:55 +0300 Message-ID: <20200412194859.12663-18-rppt@kernel.org> (raw) In-Reply-To: <20200412194859.12663-1-rppt@kernel.org> From: Mike Rapoport <rppt@linux.ibm.com> Some architectures (e.g. ARC) have the ZONE_HIGHMEM zone below the ZONE_NORMAL. Allowing free_area_init() parse max_zone_pfn array even it is sorted in descending order allows using free_area_init() on such architectures. Add top -> down traversal of max_zone_pfn array in free_area_init() and use the latter in ARC node/zone initialization. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> --- arch/arc/mm/init.c | 36 +++++++----------------------------- mm/page_alloc.c | 24 +++++++++++++++++++----- 2 files changed, 26 insertions(+), 34 deletions(-) diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c index 0920c969c466..41eb9be1653c 100644 --- a/arch/arc/mm/init.c +++ b/arch/arc/mm/init.c @@ -63,11 +63,13 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size) low_mem_sz = size; in_use = 1; + memblock_add_node(base, size, 0); } else { #ifdef CONFIG_HIGHMEM high_mem_start = base; high_mem_sz = size; in_use = 1; + memblock_add_node(base, size, 1); #endif } @@ -83,8 +85,7 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size) */ void __init setup_arch_memory(void) { - unsigned long zones_size[MAX_NR_ZONES]; - unsigned long zones_holes[MAX_NR_ZONES]; + unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 }; init_mm.start_code = (unsigned long)_text; init_mm.end_code = (unsigned long)_etext; @@ -115,7 +116,6 @@ void __init setup_arch_memory(void) * the crash */ - memblock_add_node(low_mem_start, low_mem_sz, 0); memblock_reserve(CONFIG_LINUX_LINK_BASE, __pa(_end) - CONFIG_LINUX_LINK_BASE); @@ -133,22 +133,7 @@ void __init setup_arch_memory(void) memblock_dump_all(); /*----------------- node/zones setup --------------------------*/ - memset(zones_size, 0, sizeof(zones_size)); - memset(zones_holes, 0, sizeof(zones_holes)); - - zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn; - zones_holes[ZONE_NORMAL] = 0; - - /* - * We can't use the helper free_area_init(zones[]) because it uses - * PAGE_OFFSET to compute the @min_low_pfn which would be wrong - * when our kernel doesn't start at PAGE_OFFSET, i.e. - * PAGE_OFFSET != CONFIG_LINUX_RAM_BASE - */ - free_area_init_node(0, /* node-id */ - zones_size, /* num pages per zone */ - min_low_pfn, /* first pfn of node */ - zones_holes); /* holes */ + max_zone_pfn[ZONE_NORMAL] = max_low_pfn; #ifdef CONFIG_HIGHMEM /* @@ -168,20 +153,13 @@ void __init setup_arch_memory(void) min_high_pfn = PFN_DOWN(high_mem_start); max_high_pfn = PFN_DOWN(high_mem_start + high_mem_sz); - zones_size[ZONE_NORMAL] = 0; - zones_holes[ZONE_NORMAL] = 0; - - zones_size[ZONE_HIGHMEM] = max_high_pfn - min_high_pfn; - zones_holes[ZONE_HIGHMEM] = 0; - - free_area_init_node(1, /* node-id */ - zones_size, /* num pages per zone */ - min_high_pfn, /* first pfn of node */ - zones_holes); /* holes */ + max_zone_pfn[ZONE_HIGHMEM] = max_high_pfn; high_memory = (void *)(min_high_pfn << PAGE_SHIFT); kmap_init(); #endif + + free_area_init(max_zone_pfn); } /* diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 343d87b8697d..376434c7a78b 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -7429,7 +7429,8 @@ static void check_for_memory(pg_data_t *pgdat, int nid) void __init free_area_init(unsigned long *max_zone_pfn) { unsigned long start_pfn, end_pfn; - int i, nid; + int i, nid, zone; + bool descending = false; /* Record where the zone boundaries are */ memset(arch_zone_lowest_possible_pfn, 0, @@ -7439,13 +7440,26 @@ void __init free_area_init(unsigned long *max_zone_pfn) start_pfn = find_min_pfn_with_active_regions(); + /* + * Some architecturs, e.g. ARC may have ZONE_HIGHMEM below + * ZONE_NORMAL. For such cases we allow max_zone_pfn sorted in the + * descending order + */ + if (MAX_NR_ZONES > 1 && max_zone_pfn[0] > max_zone_pfn[1]) + descending = true; + for (i = 0; i < MAX_NR_ZONES; i++) { - if (i == ZONE_MOVABLE) + if (descending) + zone = MAX_NR_ZONES - i - 1; + else + zone = i; + + if (zone == ZONE_MOVABLE) continue; - end_pfn = max(max_zone_pfn[i], start_pfn); - arch_zone_lowest_possible_pfn[i] = start_pfn; - arch_zone_highest_possible_pfn[i] = end_pfn; + end_pfn = max(max_zone_pfn[zone], start_pfn); + arch_zone_lowest_possible_pfn[zone] = start_pfn; + arch_zone_highest_possible_pfn[zone] = end_pfn; start_pfn = end_pfn; } -- 2.25.1
next prev parent reply index Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-04-12 19:48 [PATCH 00/21] mm: rework free_area_init*() funcitons Mike Rapoport 2020-04-12 19:48 ` [PATCH 01/21] mm: memblock: replace dereferences of memblock_region.nid with API calls Mike Rapoport 2020-04-21 2:06 ` Baoquan He 2020-04-12 19:48 ` [PATCH 02/21] mm: make early_pfn_to_nid() and related defintions close to each other Mike Rapoport 2020-04-21 2:24 ` Baoquan He 2020-04-21 8:49 ` Mike Rapoport 2020-04-21 8:49 ` Mike Rapoport 2020-04-21 9:33 ` Baoquan He 2020-04-21 3:31 ` Baoquan He 2020-04-21 8:39 ` Mike Rapoport 2020-04-21 8:39 ` Mike Rapoport 2020-04-12 19:48 ` [PATCH 03/21] mm: remove CONFIG_HAVE_MEMBLOCK_NODE_MAP option Mike Rapoport 2020-04-21 4:23 ` Baoquan He 2020-04-21 9:09 ` Mike Rapoport 2020-04-21 9:09 ` Mike Rapoport 2020-04-21 9:45 ` Baoquan He 2020-04-12 19:48 ` [PATCH 04/21] mm: free_area_init: use maximal zone PFNs rather than zone sizes Mike Rapoport 2020-04-22 23:41 ` Baoquan He 2020-06-15 3:53 ` Greg Ungerer 2020-06-15 6:22 ` Mike Rapoport 2020-06-15 6:22 ` Mike Rapoport 2020-06-15 7:17 ` Greg Ungerer 2020-04-12 19:48 ` [PATCH 05/21] mm: use free_area_init() instead of free_area_init_nodes() Mike Rapoport 2020-04-23 0:02 ` Baoquan He 2020-04-12 19:48 ` [PATCH 06/21] alpha: simplify detection of memory zone boundaries Mike Rapoport 2020-04-12 19:48 ` [PATCH 07/21] arm: " Mike Rapoport 2020-04-12 19:48 ` [PATCH 08/21] arm64: simplify detection of memory zone boundaries for UMA configs Mike Rapoport 2020-04-12 19:48 ` [PATCH 09/21] csky: simplify detection of memory zone boundaries Mike Rapoport 2020-04-12 19:48 ` [PATCH 10/21] m68k: mm: " Mike Rapoport 2020-04-12 19:48 ` [PATCH 11/21] parisc: " Mike Rapoport 2020-04-12 19:48 ` [PATCH 12/21] sparc32: " Mike Rapoport 2020-04-12 19:48 ` [PATCH 13/21] unicore32: " Mike Rapoport 2020-04-12 19:48 ` [PATCH 14/21] xtensa: " Mike Rapoport 2020-04-12 19:48 ` [PATCH 15/21] mm: memmap_init: iterate over memblock regions rather that check each PFN Mike Rapoport 2020-04-20 14:26 ` Qian Cai 2020-04-24 7:22 ` David Hildenbrand 2020-04-25 16:49 ` Mike Rapoport 2020-04-25 16:49 ` Mike Rapoport 2020-04-12 19:48 ` [PATCH 16/21] mm: remove early_pfn_in_nid() and CONFIG_NODES_SPAN_OTHER_NODES Mike Rapoport 2020-04-23 1:13 ` Baoquan He 2020-04-23 5:50 ` Mike Rapoport 2020-04-23 5:50 ` Mike Rapoport 2020-05-18 21:38 ` Hoan Tran 2020-04-12 19:48 ` Mike Rapoport [this message] 2020-04-23 2:53 ` [PATCH 17/21] mm: free_area_init: allow defining max_zone_pfn in descending order Baoquan He 2020-04-23 2:57 ` Baoquan He 2020-04-23 5:55 ` Mike Rapoport 2020-04-23 5:55 ` Mike Rapoport 2020-04-24 0:33 ` Baoquan He 2020-04-12 19:48 ` [PATCH 18/21] mm: rename free_area_init_node() to free_area_init_memoryless_node() Mike Rapoport 2020-04-23 3:14 ` Baoquan He 2020-04-23 6:18 ` Mike Rapoport 2020-04-23 6:18 ` Mike Rapoport 2020-04-12 19:48 ` [PATCH 19/21] mm: clean up free_area_init_node() and its helpers Mike Rapoport 2020-04-12 19:48 ` [PATCH 20/21] mm: simplify find_min_pfn_with_active_regions() Mike Rapoport 2020-04-12 19:48 ` [PATCH 21/21] docs/vm: update memory-models documentation Mike Rapoport
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