[PATCH v2 5/6] arch: simplify several early memory allocations

Mike Rapoport
2018-12-03T15:58:04Z

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().

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
---
arch/arm/mm/mmu.c | 4 +---
arch/c6x/mm/dma-coherent.c | 9 ++-------
arch/nds32/mm/init.c | 12 ++++--------
arch/powerpc/kernel/setup-common.c | 4 ++--
arch/powerpc/mm/pgtable_32.c | 4 +---
arch/powerpc/mm/ppc_mmu_32.c | 3 +--
arch/powerpc/platforms/powernv/opal.c | 3 +--
arch/sparc/kernel/prom_64.c | 7 ++-----
arch/sparc/mm/init_64.c | 9 +++------
arch/unicore32/mm/mmu.c | 4 +---
10 files changed, 18 insertions(+), 41 deletions(-)

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index f5cc1cc..0a04c9a5 100644
--- a/arch/arm/mm/mmu.c
+++ b/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)
diff --git a/arch/c6x/mm/dma-coherent.c b/arch/c6x/mm/dma-coherent.c
index 01305c7..ffc49e2 100644
--- a/arch/c6x/mm/dma-coherent.c
+++ b/arch/c6x/mm/dma-coherent.c
@@ -118,8 +118,6 @@ void arch_dma_free(struct device *dev, size_t size, void *vaddr,
*/
void __init coherent_mem_init(phys_addr_t start, u32 size)
{
- phys_addr_t bitmap_phys;
-
if (!size)
return;

@@ -135,11 +133,8 @@ void __init coherent_mem_init(phys_addr_t start, u32 size)
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,
diff --git a/arch/nds32/mm/init.c b/arch/nds32/mm/init.c
index 131104b..9f19be8 100644
--- a/arch/nds32/mm/init.c
+++ b/arch/nds32/mm/init.c
@@ -80,8 +80,7 @@ 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 */
@@ -113,8 +112,7 @@ 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
@@ -126,8 +124,7 @@ 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 */
@@ -152,8 +149,7 @@ 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);
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 93ee370..8f6c763 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/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;
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index bda3c6f..9931e68 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -50,9 +50,7 @@ __ref pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
if (slab_is_available()) {
pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
} else {
- pte = __va(memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE));
- if (pte)
- clear_page(pte);
+ pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
}
return pte;
}
diff --git a/arch/powerpc/mm/ppc_mmu_32.c b/arch/powerpc/mm/ppc_mmu_32.c
index f6f575b..fddf823 100644
--- a/arch/powerpc/mm/ppc_mmu_32.c
+++ b/arch/powerpc/mm/ppc_mmu_32.c
@@ -224,8 +224,7 @@ 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);
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index beed86f..29ee2ea 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -171,8 +171,7 @@ int __init early_init_dt_scan_recoverable_ranges(unsigned long node,
/*
* 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 =
diff --git a/arch/sparc/kernel/prom_64.c b/arch/sparc/kernel/prom_64.c
index c37955d..2a17665 100644
--- a/arch/sparc/kernel/prom_64.c
+++ b/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;
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index 3c8aac2..52884f4 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -1089,16 +1089,13 @@ static void __init allocate_node_data(int nid)
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
diff --git a/arch/unicore32/mm/mmu.c b/arch/unicore32/mm/mmu.c
index 040a8c2..50d8c1a 100644
--- a/arch/unicore32/mm/mmu.c
+++ b/arch/unicore32/mm/mmu.c
@@ -143,9 +143,7 @@ static void __init build_mem_type_table(void)

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,
--
2.7.4