[PATCH v2 02/28] arc: introduce arch_zone_limits_init()
From: Mike Rapoport <rppt@kernel.org>
Date: 2026-01-02 07:00:53
Also in:
linux-alpha, linux-cxl, linux-doc, linux-m68k, linux-mips, linux-mm, linux-riscv, linux-s390, linux-sh, linux-um, lkml, loongarch, sparclinux
Subsystem:
synopsys arc architecture, the rest · Maintainers:
Vineet Gupta, Linus Torvalds
From: "Mike Rapoport (Microsoft)" <rppt@kernel.org> Move calculations of zone limits to a dedicated arch_zone_limits_init() function. Later MM core will use this function as an architecture specific callback during nodes and zones initialization and thus there won't be a need to call free_area_init() from every architecture. Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org> --- arch/arc/mm/init.c | 34 ++++++++++++++++++++-------------- 1 file changed, 20 insertions(+), 14 deletions(-)
diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
index a73cc94f806e..ff7974d38011 100644
--- a/arch/arc/mm/init.c
+++ b/arch/arc/mm/init.c@@ -75,6 +75,25 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size) base, TO_MB(size), !in_use ? "Not used":""); } +void __init arch_zone_limits_init(unsigned long *max_zone_pfn) +{ + /*----------------- node/zones setup --------------------------*/ + max_zone_pfn[ZONE_NORMAL] = max_low_pfn; + +#ifdef CONFIG_HIGHMEM + /* + * max_high_pfn should be ok here for both HIGHMEM and HIGHMEM+PAE. + * For HIGHMEM without PAE max_high_pfn should be less than + * min_low_pfn to guarantee that these two regions don't overlap. + * For PAE case highmem is greater than lowmem, so it is natural + * to use max_high_pfn. + * + * In both cases, holes should be handled by pfn_valid(). + */ + max_zone_pfn[ZONE_HIGHMEM] = max_high_pfn; +#endif +} + /* * First memory setup routine called from setup_arch() * 1. setup swapper's mm @init_mm
@@ -122,9 +141,6 @@ void __init setup_arch_memory(void) memblock_dump_all(); - /*----------------- node/zones setup --------------------------*/ - max_zone_pfn[ZONE_NORMAL] = max_low_pfn; - #ifdef CONFIG_HIGHMEM /* * On ARC (w/o PAE) HIGHMEM addresses are actually smaller (0 based)
@@ -139,21 +155,11 @@ 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); - /* - * max_high_pfn should be ok here for both HIGHMEM and HIGHMEM+PAE. - * For HIGHMEM without PAE max_high_pfn should be less than - * min_low_pfn to guarantee that these two regions don't overlap. - * For PAE case highmem is greater than lowmem, so it is natural - * to use max_high_pfn. - * - * In both cases, holes should be handled by pfn_valid(). - */ - max_zone_pfn[ZONE_HIGHMEM] = max_high_pfn; - arch_pfn_offset = min(min_low_pfn, min_high_pfn); kmap_init(); #endif /* CONFIG_HIGHMEM */ + arch_zone_limits_init(max_zone_pfn); free_area_init(max_zone_pfn); }
--
2.51.0