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authorKefeng Wang <wangkefeng.wang@huawei.com>2022-01-19 18:07:53 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2022-01-20 08:52:52 +0200
commit20c035764626c56c4f6514936b9ee4be0f4cd962 (patch)
tree7e4c8e74744b25aec790f40b93ba321943c4a05e /arch/sparc/kernel
parent23f917169ef157aa7a6bf80d8c4aad6f1282852c (diff)
mm: percpu: add generic pcpu_populate_pte() function
With NEED_PER_CPU_PAGE_FIRST_CHUNK enabled, we need a function to populate pte, this patch adds a generic pcpu populate pte function, pcpu_populate_pte(), which is marked __weak and used on most architectures, but it is overridden on x86, which has its own implementation. Link: https://lkml.kernel.org/r/20211216112359.103822-5-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: "Rafael J. Wysocki" <rafael@kernel.org> Cc: Dennis Zhou <dennis@kernel.org> Cc: Tejun Heo <tj@kernel.org> Cc: Christoph Lameter <cl@linux.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/sparc/kernel')
-rw-r--r--arch/sparc/kernel/smp_64.c56
1 files changed, 1 insertions, 55 deletions
diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index ef815b3f0592..a1f78e9ddaf3 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -1539,59 +1539,6 @@ static int __init pcpu_cpu_to_node(int cpu)
return cpu_to_node(cpu);
}
-static void __init pcpu_populate_pte(unsigned long addr)
-{
- pgd_t *pgd = pgd_offset_k(addr);
- p4d_t *p4d;
- pud_t *pud;
- pmd_t *pmd;
-
- if (pgd_none(*pgd)) {
- pud_t *new;
-
- new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
- if (!new)
- goto err_alloc;
- pgd_populate(&init_mm, pgd, new);
- }
-
- p4d = p4d_offset(pgd, addr);
- if (p4d_none(*p4d)) {
- pud_t *new;
-
- new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
- if (!new)
- goto err_alloc;
- p4d_populate(&init_mm, p4d, new);
- }
-
- pud = pud_offset(p4d, addr);
- if (pud_none(*pud)) {
- pmd_t *new;
-
- new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
- if (!new)
- goto err_alloc;
- pud_populate(&init_mm, pud, new);
- }
-
- pmd = pmd_offset(pud, addr);
- if (!pmd_present(*pmd)) {
- pte_t *new;
-
- new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
- if (!new)
- goto err_alloc;
- pmd_populate_kernel(&init_mm, pmd, new);
- }
-
- return;
-
-err_alloc:
- panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
- __func__, PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
-}
-
void __init setup_per_cpu_areas(void)
{
unsigned long delta;
@@ -1610,8 +1557,7 @@ void __init setup_per_cpu_areas(void)
}
if (rc < 0)
rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE,
- pcpu_cpu_to_node,
- pcpu_populate_pte);
+ pcpu_cpu_to_node);
if (rc < 0)
panic("cannot initialize percpu area (err=%d)", rc);