Re: [RFC PATCH 20/29] memblock: replace __alloc_bootmem with memblock_alloc_from

From: Mike Rapoport
Date: Thu Sep 06 2018 - 08:58:17 EST

On Thu, Sep 06, 2018 at 10:52:05AM +0200, Michal Hocko wrote:
> On Wed 05-09-18 18:59:35, Mike Rapoport wrote:
> > The conversion is done using the following semantic patch:
> >
> > @@
> > expression e1, e2, e3;
> > @@
> > - __alloc_bootmem(e1, e2, e3)
> > + memblock_alloc(e1, e2, e3)
>
> This is not that straightforward. memblock_virt_alloc with 0 alignment
> uses SMP_CACHE_BYTES implicitly. I do not see this being handled here.
> I do not expect this should cause any problems, it would be worse other
> way around, but it should be at least documented.

Huh, I've copied the contents of the wrong coccinelle script to the
changelog. This should have been

- __alloc_bootmem(e1, e2, e3)
+ memblock_alloc_from(e1, e2, e3)

Or if replace e1, e2, e3 with more meaningful names

- __alloc_bootmem(size, align, goal)
+ memblock_alloc_from(size, align, min_addr)

That said, the parameters have the exact mapping and the same meaning, so
the alignment and the goal requirements will be handled.

I'll update all the scripts in the changelogs with normal names and add
more elaborate descriptions for all patches.

> > Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
> > ---
> > arch/alpha/kernel/core_cia.c | 2 +-
> > arch/alpha/kernel/pci_iommu.c | 4 ++--
> > arch/alpha/kernel/setup.c | 2 +-
> > arch/ia64/kernel/mca.c | 4 ++--
> > arch/ia64/mm/contig.c | 5 +++--
> > arch/mips/kernel/traps.c | 2 +-
> > arch/sparc/kernel/prom_32.c | 2 +-
> > arch/sparc/kernel/smp_64.c | 10 +++++-----
> > arch/sparc/mm/init_32.c | 2 +-
> > arch/sparc/mm/init_64.c | 9 ++++++---
> > arch/sparc/mm/srmmu.c | 10 +++++-----
> > include/linux/bootmem.h | 8 ++++++++
> > 12 files changed, 36 insertions(+), 24 deletions(-)
> >
> > diff --git a/arch/alpha/kernel/core_cia.c b/arch/alpha/kernel/core_cia.c
> > index 4b38386..026ee95 100644
> > --- a/arch/alpha/kernel/core_cia.c
> > +++ b/arch/alpha/kernel/core_cia.c
> > @@ -331,7 +331,7 @@ cia_prepare_tbia_workaround(int window)
> > long i;
> >
> > /* Use minimal 1K map. */
> > - ppte = __alloc_bootmem(CIA_BROKEN_TBIA_SIZE, 32768, 0);
> > + ppte = memblock_alloc_from(CIA_BROKEN_TBIA_SIZE, 32768, 0);
> > pte = (virt_to_phys(ppte) >> (PAGE_SHIFT - 1)) | 1;
> >
> > for (i = 0; i < CIA_BROKEN_TBIA_SIZE / sizeof(unsigned long); ++i)
> > diff --git a/arch/alpha/kernel/pci_iommu.c b/arch/alpha/kernel/pci_iommu.c
> > index b52d76f..0c05493 100644
> > --- a/arch/alpha/kernel/pci_iommu.c
> > +++ b/arch/alpha/kernel/pci_iommu.c
> > @@ -87,13 +87,13 @@ iommu_arena_new_node(int nid, struct pci_controller *hose, dma_addr_t base,
> > printk("%s: couldn't allocate arena ptes from node %d\n"
> > " falling back to system-wide allocation\n",
> > __func__, nid);
> > - arena->ptes = __alloc_bootmem(mem_size, align, 0);
> > + arena->ptes = memblock_alloc_from(mem_size, align, 0);
> > }
> >
> > #else /* CONFIG_DISCONTIGMEM */
> >
> > arena = alloc_bootmem(sizeof(*arena));
> > - arena->ptes = __alloc_bootmem(mem_size, align, 0);
> > + arena->ptes = memblock_alloc_from(mem_size, align, 0);
> >
> > #endif /* CONFIG_DISCONTIGMEM */
> >
> > diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c
> > index 4f0d944..64c06a0 100644
> > --- a/arch/alpha/kernel/setup.c
> > +++ b/arch/alpha/kernel/setup.c
> > @@ -294,7 +294,7 @@ move_initrd(unsigned long mem_limit)
> > unsigned long size;
> >
> > size = initrd_end - initrd_start;
> > - start = __alloc_bootmem(PAGE_ALIGN(size), PAGE_SIZE, 0);
> > + start = memblock_alloc_from(PAGE_ALIGN(size), PAGE_SIZE, 0);
> > if (!start || __pa(start) + size > mem_limit) {
> > initrd_start = initrd_end = 0;
> > return NULL;
> > diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
> > index 6115464..5586926 100644
> > --- a/arch/ia64/kernel/mca.c
> > +++ b/arch/ia64/kernel/mca.c
> > @@ -1835,8 +1835,8 @@ format_mca_init_stack(void *mca_data, unsigned long offset,
> > /* Caller prevents this from being called after init */
> > static void * __ref mca_bootmem(void)
> > {
> > - return __alloc_bootmem(sizeof(struct ia64_mca_cpu),
> > - KERNEL_STACK_SIZE, 0);
> > + return memblock_alloc_from(sizeof(struct ia64_mca_cpu),
> > + KERNEL_STACK_SIZE, 0);
> > }
> >
> > /* Do per-CPU MCA-related initialization. */
> > diff --git a/arch/ia64/mm/contig.c b/arch/ia64/mm/contig.c
> > index e2e40bb..9e5c23a 100644
> > --- a/arch/ia64/mm/contig.c
> > +++ b/arch/ia64/mm/contig.c
> > @@ -85,8 +85,9 @@ void *per_cpu_init(void)
> > static inline void
> > alloc_per_cpu_data(void)
> > {
> > - cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * num_possible_cpus(),
> > - PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
> > + cpu_data = memblock_alloc_from(PERCPU_PAGE_SIZE * num_possible_cpus(),
> > + PERCPU_PAGE_SIZE,
> > + __pa(MAX_DMA_ADDRESS));
> > }
> >
> > /**
> > diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
> > index 576aeef..31566d5 100644
> > --- a/arch/mips/kernel/traps.c
> > +++ b/arch/mips/kernel/traps.c
> > @@ -2261,7 +2261,7 @@ void __init trap_init(void)
> > phys_addr_t ebase_pa;
> >
> > ebase = (unsigned long)
> > - __alloc_bootmem(size, 1 << fls(size), 0);
> > + memblock_alloc_from(size, 1 << fls(size), 0);
> >
> > /*
> > * Try to ensure ebase resides in KSeg0 if possible.
> > diff --git a/arch/sparc/kernel/prom_32.c b/arch/sparc/kernel/prom_32.c
> > index b51cbb9..4389944 100644
> > --- a/arch/sparc/kernel/prom_32.c
> > +++ b/arch/sparc/kernel/prom_32.c
> > @@ -32,7 +32,7 @@ void * __init prom_early_alloc(unsigned long size)
> > {
> > void *ret;
> >
> > - ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
> > + ret = memblock_alloc_from(size, SMP_CACHE_BYTES, 0UL);
> > if (ret != NULL)
> > memset(ret, 0, size);
> >
> > diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
> > index 83ff88d..337febd 100644
> > --- a/arch/sparc/kernel/smp_64.c
> > +++ b/arch/sparc/kernel/smp_64.c
> > @@ -1588,7 +1588,7 @@ static void * __init pcpu_alloc_bootmem(unsigned int cpu, size_t size,
> > void *ptr;
> >
> > if (!node_online(node) || !NODE_DATA(node)) {
> > - ptr = __alloc_bootmem(size, align, goal);
> > + ptr = memblock_alloc_from(size, align, goal);
> > pr_info("cpu %d has no node %d or node-local memory\n",
> > cpu, node);
> > pr_debug("per cpu data for cpu%d %lu bytes at %016lx\n",
> > @@ -1601,7 +1601,7 @@ static void * __init pcpu_alloc_bootmem(unsigned int cpu, size_t size,
> > }
> > return ptr;
> > #else
> > - return __alloc_bootmem(size, align, goal);
> > + return memblock_alloc_from(size, align, goal);
> > #endif
> > }
> >
> > @@ -1627,7 +1627,7 @@ static void __init pcpu_populate_pte(unsigned long addr)
> > if (pgd_none(*pgd)) {
> > pud_t *new;
> >
> > - new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
> > + new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
> > pgd_populate(&init_mm, pgd, new);
> > }
> >
> > @@ -1635,7 +1635,7 @@ static void __init pcpu_populate_pte(unsigned long addr)
> > if (pud_none(*pud)) {
> > pmd_t *new;
> >
> > - new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
> > + new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
> > pud_populate(&init_mm, pud, new);
> > }
> >
> > @@ -1643,7 +1643,7 @@ static void __init pcpu_populate_pte(unsigned long addr)
> > if (!pmd_present(*pmd)) {
> > pte_t *new;
> >
> > - new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
> > + new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
> > pmd_populate_kernel(&init_mm, pmd, new);
> > }
> > }
> > diff --git a/arch/sparc/mm/init_32.c b/arch/sparc/mm/init_32.c
> > index 92634d4..885dd38 100644
> > --- a/arch/sparc/mm/init_32.c
> > +++ b/arch/sparc/mm/init_32.c
> > @@ -265,7 +265,7 @@ void __init mem_init(void)
> > i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
> > i += 1;
> > sparc_valid_addr_bitmap = (unsigned long *)
> > - __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
> > + memblock_alloc_from(i << 2, SMP_CACHE_BYTES, 0UL);
> >
> > if (sparc_valid_addr_bitmap == NULL) {
> > prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
> > diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
> > index 578ec3d..51cd583 100644
> > --- a/arch/sparc/mm/init_64.c
> > +++ b/arch/sparc/mm/init_64.c
> > @@ -1810,7 +1810,8 @@ static unsigned long __ref kernel_map_range(unsigned long pstart,
> > if (pgd_none(*pgd)) {
> > pud_t *new;
> >
> > - new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
> > + new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE,
> > + PAGE_SIZE);
> > alloc_bytes += PAGE_SIZE;
> > pgd_populate(&init_mm, pgd, new);
> > }
> > @@ -1822,7 +1823,8 @@ static unsigned long __ref kernel_map_range(unsigned long pstart,
> > vstart = kernel_map_hugepud(vstart, vend, pud);
> > continue;
> > }
> > - new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
> > + new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE,
> > + PAGE_SIZE);
> > alloc_bytes += PAGE_SIZE;
> > pud_populate(&init_mm, pud, new);
> > }
> > @@ -1835,7 +1837,8 @@ static unsigned long __ref kernel_map_range(unsigned long pstart,
> > vstart = kernel_map_hugepmd(vstart, vend, pmd);
> > continue;
> > }
> > - new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
> > + new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE,
> > + PAGE_SIZE);
> > alloc_bytes += PAGE_SIZE;
> > pmd_populate_kernel(&init_mm, pmd, new);
> > }
> > diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
> > index be9cb00..b48fea5 100644
> > --- a/arch/sparc/mm/srmmu.c
> > +++ b/arch/sparc/mm/srmmu.c
> > @@ -303,13 +303,13 @@ static void __init srmmu_nocache_init(void)
> >
> > bitmap_bits = srmmu_nocache_size >> SRMMU_NOCACHE_BITMAP_SHIFT;
> >
> > - srmmu_nocache_pool = __alloc_bootmem(srmmu_nocache_size,
> > - SRMMU_NOCACHE_ALIGN_MAX, 0UL);
> > + srmmu_nocache_pool = memblock_alloc_from(srmmu_nocache_size,
> > + SRMMU_NOCACHE_ALIGN_MAX, 0UL);
> > memset(srmmu_nocache_pool, 0, srmmu_nocache_size);
> >
> > srmmu_nocache_bitmap =
> > - __alloc_bootmem(BITS_TO_LONGS(bitmap_bits) * sizeof(long),
> > - SMP_CACHE_BYTES, 0UL);
> > + memblock_alloc_from(BITS_TO_LONGS(bitmap_bits) * sizeof(long),
> > + SMP_CACHE_BYTES, 0UL);
> > bit_map_init(&srmmu_nocache_map, srmmu_nocache_bitmap, bitmap_bits);
> >
> > srmmu_swapper_pg_dir = __srmmu_get_nocache(SRMMU_PGD_TABLE_SIZE, SRMMU_PGD_TABLE_SIZE);
> > @@ -467,7 +467,7 @@ static void __init sparc_context_init(int numctx)
> > unsigned long size;
> >
> > size = numctx * sizeof(struct ctx_list);
> > - ctx_list_pool = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
> > + ctx_list_pool = memblock_alloc_from(size, SMP_CACHE_BYTES, 0UL);
> >
> > for (ctx = 0; ctx < numctx; ctx++) {
> > struct ctx_list *clist;
> > diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h
> > index 3896af2..c97c105 100644
> > --- a/include/linux/bootmem.h
> > +++ b/include/linux/bootmem.h
> > @@ -122,6 +122,14 @@ static inline void * __init memblock_alloc_raw(
> > NUMA_NO_NODE);
> > }
> >
> > +static inline void * __init memblock_alloc_from(
> > + phys_addr_t size, phys_addr_t align, phys_addr_t min_addr)
> > +{
> > + return memblock_alloc_try_nid(size, align, min_addr,
> > + BOOTMEM_ALLOC_ACCESSIBLE,
> > + NUMA_NO_NODE);
> > +}
> > +
> > static inline void * __init memblock_alloc_nopanic(
> > phys_addr_t size, phys_addr_t align)
> > {
> > --
> > 2.7.4
> >
>
> --
> Michal Hocko
> SUSE Labs
>

--
Sincerely yours,
Mike.