From: Mike Rapoport <rppt@xxxxxxxxxxxxx> Subject: arch: simplify several early memory allocations There are several early memory allocations in arch/ code that use memblock_phys_alloc() to allocate memory, convert the returned physical address to the virtual address and then set the allocated memory to zero. Exactly the same behaviour can be achieved simply by calling memblock_alloc(): it allocates the memory in the same way as memblock_phys_alloc(), then it performs the phys_to_virt() conversion and clears the allocated memory. Replace the longer sequence with a simpler call to memblock_alloc(). Link: http://lkml.kernel.org/r/1546248566-14910-6-git-send-email-rppt@xxxxxxxxxxxxx Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx> Cc: "David S. Miller" <davem@xxxxxxxxxxxxx> Cc: Greentime Hu <green.hu@xxxxxxxxx> Cc: Guan Xuetao <gxt@xxxxxxxxxx> Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx> Cc: Jonas Bonn <jonas@xxxxxxxxxxxx> Cc: Mark Salter <msalter@xxxxxxxxxx> Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxx> Cc: Michal Simek <michal.simek@xxxxxxxxxx> Cc: Michal Simek <monstr@xxxxxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: Rich Felker <dalias@xxxxxxxx> Cc: Russell King <linux@xxxxxxxxxxxxxxx> Cc: Stafford Horne <shorne@xxxxxxxxx> Cc: Stefan Kristiansson <stefan.kristiansson@xxxxxxxxxxxxx> Cc: Vincent Chen <deanbo422@xxxxxxxxx> Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- --- a/arch/arm/mm/mmu.c~arch-simplify-several-early-memory-allocations +++ a/arch/arm/mm/mmu.c @@ -721,9 +721,7 @@ EXPORT_SYMBOL(phys_mem_access_prot); static void __init *early_alloc_aligned(unsigned long sz, unsigned long align) { - void *ptr = __va(memblock_phys_alloc(sz, align)); - memset(ptr, 0, sz); - return ptr; + return memblock_alloc(sz, align); } static void __init *early_alloc(unsigned long sz) --- a/arch/c6x/mm/dma-coherent.c~arch-simplify-several-early-memory-allocations +++ a/arch/c6x/mm/dma-coherent.c @@ -121,8 +121,6 @@ void arch_dma_free(struct device *dev, s */ void __init coherent_mem_init(phys_addr_t start, u32 size) { - phys_addr_t bitmap_phys; - if (!size) return; @@ -138,11 +136,8 @@ void __init coherent_mem_init(phys_addr_ if (dma_size & (PAGE_SIZE - 1)) ++dma_pages; - bitmap_phys = memblock_phys_alloc(BITS_TO_LONGS(dma_pages) * sizeof(long), - sizeof(long)); - - dma_bitmap = phys_to_virt(bitmap_phys); - memset(dma_bitmap, 0, dma_pages * PAGE_SIZE); + dma_bitmap = memblock_alloc(BITS_TO_LONGS(dma_pages) * sizeof(long), + sizeof(long)); } static void c6x_dma_sync(struct device *dev, phys_addr_t paddr, size_t size, --- a/arch/nds32/mm/init.c~arch-simplify-several-early-memory-allocations +++ a/arch/nds32/mm/init.c @@ -78,8 +78,7 @@ static void __init map_ram(void) } /* Alloc one page for holding PTE's... */ - pte = (pte_t *) __va(memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE)); - memset(pte, 0, PAGE_SIZE); + pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE); set_pmd(pme, __pmd(__pa(pte) + _PAGE_KERNEL_TABLE)); /* Fill the newly allocated page with PTE'S */ @@ -111,8 +110,7 @@ static void __init fixedrange_init(void) pgd = swapper_pg_dir + pgd_index(vaddr); pud = pud_offset(pgd, vaddr); pmd = pmd_offset(pud, vaddr); - fixmap_pmd_p = (pmd_t *) __va(memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE)); - memset(fixmap_pmd_p, 0, PAGE_SIZE); + fixmap_pmd_p = memblock_alloc(PAGE_SIZE, PAGE_SIZE); set_pmd(pmd, __pmd(__pa(fixmap_pmd_p) + _PAGE_KERNEL_TABLE)); #ifdef CONFIG_HIGHMEM @@ -124,8 +122,7 @@ static void __init fixedrange_init(void) pgd = swapper_pg_dir + pgd_index(vaddr); pud = pud_offset(pgd, vaddr); pmd = pmd_offset(pud, vaddr); - pte = (pte_t *) __va(memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE)); - memset(pte, 0, PAGE_SIZE); + pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE); set_pmd(pmd, __pmd(__pa(pte) + _PAGE_KERNEL_TABLE)); pkmap_page_table = pte; #endif /* CONFIG_HIGHMEM */ @@ -150,8 +147,7 @@ void __init paging_init(void) fixedrange_init(); /* allocate space for empty_zero_page */ - zero_page = __va(memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE)); - memset(zero_page, 0, PAGE_SIZE); + zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE); zone_sizes_init(); empty_zero_page = virt_to_page(zero_page); --- a/arch/powerpc/kernel/setup-common.c~arch-simplify-several-early-memory-allocations +++ a/arch/powerpc/kernel/setup-common.c @@ -459,8 +459,8 @@ void __init smp_setup_cpu_maps(void) DBG("smp_setup_cpu_maps()\n"); - cpu_to_phys_id = __va(memblock_phys_alloc(nr_cpu_ids * sizeof(u32), __alignof__(u32))); - memset(cpu_to_phys_id, 0, nr_cpu_ids * sizeof(u32)); + cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32), + __alignof__(u32)); for_each_node_by_type(dn, "cpu") { const __be32 *intserv; --- a/arch/powerpc/mm/ppc_mmu_32.c~arch-simplify-several-early-memory-allocations +++ a/arch/powerpc/mm/ppc_mmu_32.c @@ -211,8 +211,7 @@ void __init MMU_init_hw(void) * Find some memory for the hash table. */ if ( ppc_md.progress ) ppc_md.progress("hash:find piece", 0x322); - Hash = __va(memblock_phys_alloc(Hash_size, Hash_size)); - memset(Hash, 0, Hash_size); + Hash = memblock_alloc(Hash_size, Hash_size); _SDR1 = __pa(Hash) | SDR1_LOW_BITS; Hash_end = (struct hash_pte *) ((unsigned long)Hash + Hash_size); --- a/arch/powerpc/platforms/powernv/opal.c~arch-simplify-several-early-memory-allocations +++ a/arch/powerpc/platforms/powernv/opal.c @@ -171,8 +171,7 @@ int __init early_init_dt_scan_recoverabl /* * Allocate a buffer to hold the MC recoverable ranges. */ - mc_recoverable_range =__va(memblock_phys_alloc(size, __alignof__(u64))); - memset(mc_recoverable_range, 0, size); + mc_recoverable_range = memblock_alloc(size, __alignof__(u64)); for (i = 0; i < mc_recoverable_range_len; i++) { mc_recoverable_range[i].start_addr = --- a/arch/s390/numa/numa.c~arch-simplify-several-early-memory-allocations +++ a/arch/s390/numa/numa.c @@ -62,11 +62,7 @@ int numa_debug_enabled; */ static __init pg_data_t *alloc_node_data(void) { - pg_data_t *res; - - res = (pg_data_t *) memblock_phys_alloc(sizeof(pg_data_t), 8); - memset(res, 0, sizeof(pg_data_t)); - return res; + return memblock_alloc(sizeof(pg_data_t), 8); } /* --- a/arch/sparc/kernel/prom_64.c~arch-simplify-several-early-memory-allocations +++ a/arch/sparc/kernel/prom_64.c @@ -34,16 +34,13 @@ void * __init prom_early_alloc(unsigned long size) { - unsigned long paddr = memblock_phys_alloc(size, SMP_CACHE_BYTES); - void *ret; + void *ret = memblock_alloc(size, SMP_CACHE_BYTES); - if (!paddr) { + if (!ret) { prom_printf("prom_early_alloc(%lu) failed\n", size); prom_halt(); } - ret = __va(paddr); - memset(ret, 0, size); prom_early_allocated += size; return ret; --- a/arch/sparc/mm/init_64.c~arch-simplify-several-early-memory-allocations +++ a/arch/sparc/mm/init_64.c @@ -1089,16 +1089,13 @@ static void __init allocate_node_data(in struct pglist_data *p; unsigned long start_pfn, end_pfn; #ifdef CONFIG_NEED_MULTIPLE_NODES - unsigned long paddr; - paddr = memblock_phys_alloc_try_nid(sizeof(struct pglist_data), - SMP_CACHE_BYTES, nid); - if (!paddr) { + NODE_DATA(nid) = memblock_alloc_node(sizeof(struct pglist_data), + SMP_CACHE_BYTES, nid); + if (!NODE_DATA(nid)) { prom_printf("Cannot allocate pglist_data for nid[%d]\n", nid); prom_halt(); } - NODE_DATA(nid) = __va(paddr); - memset(NODE_DATA(nid), 0, sizeof(struct pglist_data)); NODE_DATA(nid)->node_id = nid; #endif --- a/arch/unicore32/mm/mmu.c~arch-simplify-several-early-memory-allocations +++ a/arch/unicore32/mm/mmu.c @@ -143,9 +143,7 @@ static void __init build_mem_type_table( static void __init *early_alloc(unsigned long sz) { - void *ptr = __va(memblock_phys_alloc(sz, sz)); - memset(ptr, 0, sz); - return ptr; + return memblock_alloc(sz, sz); } static pte_t * __init early_pte_alloc(pmd_t *pmd, unsigned long addr, _
