On 2021/11/30 6:49, Dennis Zhou wrote:
On Sun, Nov 21, 2021 at 05:35:57PM +0800, Kefeng Wang wrote:
When NEED_PER_CPU_PAGE_FIRST_CHUNK enabled, we need a function to
populate pte, add a generic pcpu populate pte function and switch
to use it.
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
---
arch/powerpc/kernel/setup_64.c | 47 +--------------------
arch/sparc/kernel/smp_64.c | 57 +------------------------
arch/x86/kernel/setup_percpu.c | 5 +--
drivers/base/arch_numa.c | 51 +---------------------
include/linux/percpu.h | 5 +--
mm/percpu.c | 77 +++++++++++++++++++++++++++++++---
6 files changed, 79 insertions(+), 163 deletions(-)
...
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index cd672bd46241..4eadbe45078e 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -101,7 +101,7 @@ static int __init pcpu_cpu_to_node(int cpu)
return IS_ENABLED(CONFIG_NUMA) ? early_cpu_to_node(cpu) : NUMA_NO_NODE;
}
-static void __init pcpup_populate_pte(unsigned long addr)
+void __init pcpu_populate_pte(unsigned long addr)
{
populate_extra_pte(addr);
}
@@ -163,8 +163,7 @@ void __init setup_per_cpu_areas(void)
}
if (rc < 0)
rc = pcpu_page_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
- pcpu_cpu_to_node,
- pcpup_populate_pte);
+ pcpu_cpu_to_node);
x86 has it's own implementation that differs for 32 bit. I'm not
confident this is correct to drop in as a replacement for x86, so I'd
prefer to keep populate_pte_fn() around.
The x86's pcpup_populate_pte() version is not dropped.
We define a __weak pcpu_populate_pte function in mm/percpu.c,
and there is a own version on x86, so no function change on x86.
I will add this into changelog,
arch/x86/kernel/setup_percpu.c: void __init pcpu_populate_pte(unsigned
long addr)
include/linux/percpu.h: void __init
pcpu_populate_pte(unsigned long addr);
mm/percpu.c: void __init __weak
pcpu_populate_pte(unsigned long addr)
mm/percpu.c: pcpu_populate_pte(unit_addr + (i << PAGE_SHIFT));
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index d73c97ef4ff4..f1ec5ad1351c 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -95,7 +95,6 @@ extern const char * const pcpu_fc_names[PCPU_FC_NR];
extern enum pcpu_fc pcpu_chosen_fc;
typedef int (pcpu_fc_cpu_to_node_fn_t)(int cpu);
-typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);
extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
@@ -113,9 +112,9 @@ extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
#endif
#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
+void __init pcpu_populate_pte(unsigned long addr);
extern int __init pcpu_page_first_chunk(size_t reserved_size,
- pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn,
- pcpu_fc_populate_pte_fn_t populate_pte_fn);
+ pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn);
#endif
extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align) __alloc_size(1);
diff --git a/mm/percpu.c b/mm/percpu.c
index efaa1cbaf73d..d907daed04eb 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -3162,11 +3162,80 @@ int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
#endif /* BUILD_EMBED_FIRST_CHUNK */
...
+void __init __weak 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)) {
+ p4d_t *new;
+
+ new = memblock_alloc_from(P4D_TABLE_SIZE, P4D_TABLE_SIZE, PAGE_SIZE);
It's unnecessary to specify a min_addr to memblock_alloc_from() as it
won't allocate 0 anyway. So please use memblock_alloc() instead.
ok, will use memblock_alloc in this function
