From: Mike Rapoport <rppt@xxxxxxxxxxxxx> Subject: arm, xtensa: simplify initialization of high memory pages free_highpages() in both arm and xtensa essentially open-code for_each_free_mem_range() loop to detect high memory pages that were not reserved and that should be initialized and passed to the buddy allocator. Replace open-coded implementation of for_each_free_mem_range() with usage of memblock API to simplify the code. Link: https://lkml.kernel.org/r/20200818151634.14343-4-rppt@xxxxxxxxxx Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx> Reviewed-by: Max Filippov <jcmvbkbc@xxxxxxxxx> [xtensa] Tested-by: Max Filippov <jcmvbkbc@xxxxxxxxx> [xtensa] Cc: Andy Lutomirski <luto@xxxxxxxxxx> Cc: Baoquan He <bhe@xxxxxxxxxx> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Christoph Hellwig <hch@xxxxxx> Cc: Daniel Axtens <dja@xxxxxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> Cc: Emil Renner Berthing <kernel@xxxxxxxx> Cc: Hari Bathini <hbathini@xxxxxxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Cc: Michal Simek <monstr@xxxxxxxxx> Cc: Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx> Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Russell King <linux@xxxxxxxxxxxxxxx> Cc: Stafford Horne <shorne@xxxxxxxxx> Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Will Deacon <will@xxxxxxxxxx> Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/arm/mm/init.c | 48 +++++----------------------------- arch/xtensa/mm/init.c | 55 +++++++--------------------------------- 2 files changed, 18 insertions(+), 85 deletions(-) --- a/arch/arm/mm/init.c~arm-xtensa-simplify-initialization-of-high-memory-pages +++ a/arch/arm/mm/init.c @@ -347,61 +347,29 @@ static void __init free_unused_memmap(vo #endif } -#ifdef CONFIG_HIGHMEM -static inline void free_area_high(unsigned long pfn, unsigned long end) -{ - for (; pfn < end; pfn++) - free_highmem_page(pfn_to_page(pfn)); -} -#endif - static void __init free_highpages(void) { #ifdef CONFIG_HIGHMEM unsigned long max_low = max_low_pfn; - struct memblock_region *mem, *res; + phys_addr_t range_start, range_end; + u64 i; /* set highmem page free */ - for_each_memblock(memory, mem) { - unsigned long start = memblock_region_memory_base_pfn(mem); - unsigned long end = memblock_region_memory_end_pfn(mem); + for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, + &range_start, &range_end, NULL) { + unsigned long start = PHYS_PFN(range_start); + unsigned long end = PHYS_PFN(range_end); /* Ignore complete lowmem entries */ if (end <= max_low) continue; - if (memblock_is_nomap(mem)) - continue; - /* Truncate partial highmem entries */ if (start < max_low) start = max_low; - /* Find and exclude any reserved regions */ - for_each_memblock(reserved, res) { - unsigned long res_start, res_end; - - res_start = memblock_region_reserved_base_pfn(res); - res_end = memblock_region_reserved_end_pfn(res); - - if (res_end < start) - continue; - if (res_start < start) - res_start = start; - if (res_start > end) - res_start = end; - if (res_end > end) - res_end = end; - if (res_start != start) - free_area_high(start, res_start); - start = res_end; - if (start == end) - break; - } - - /* And now free anything which remains */ - if (start < end) - free_area_high(start, end); + for (; start < end; start++) + free_highmem_page(pfn_to_page(start)); } #endif } --- a/arch/xtensa/mm/init.c~arm-xtensa-simplify-initialization-of-high-memory-pages +++ a/arch/xtensa/mm/init.c @@ -79,67 +79,32 @@ void __init zones_init(void) free_area_init(max_zone_pfn); } -#ifdef CONFIG_HIGHMEM -static void __init free_area_high(unsigned long pfn, unsigned long end) -{ - for (; pfn < end; pfn++) - free_highmem_page(pfn_to_page(pfn)); -} - static void __init free_highpages(void) { +#ifdef CONFIG_HIGHMEM unsigned long max_low = max_low_pfn; - struct memblock_region *mem, *res; + phys_addr_t range_start, range_end; + u64 i; - reset_all_zones_managed_pages(); /* set highmem page free */ - for_each_memblock(memory, mem) { - unsigned long start = memblock_region_memory_base_pfn(mem); - unsigned long end = memblock_region_memory_end_pfn(mem); + for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, + &range_start, &range_end, NULL) { + unsigned long start = PHYS_PFN(range_start); + unsigned long end = PHYS_PFN(range_end); /* Ignore complete lowmem entries */ if (end <= max_low) continue; - if (memblock_is_nomap(mem)) - continue; - /* Truncate partial highmem entries */ if (start < max_low) start = max_low; - /* Find and exclude any reserved regions */ - for_each_memblock(reserved, res) { - unsigned long res_start, res_end; - - res_start = memblock_region_reserved_base_pfn(res); - res_end = memblock_region_reserved_end_pfn(res); - - if (res_end < start) - continue; - if (res_start < start) - res_start = start; - if (res_start > end) - res_start = end; - if (res_end > end) - res_end = end; - if (res_start != start) - free_area_high(start, res_start); - start = res_end; - if (start == end) - break; - } - - /* And now free anything which remains */ - if (start < end) - free_area_high(start, end); + for (; start < end; start++) + free_highmem_page(pfn_to_page(start)); } -} -#else -static void __init free_highpages(void) -{ -} #endif +} /* * Initialize memory pages. _
