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-rw-r--r--arch/sparc/kernel/smp_64.c12
-rw-r--r--arch/x86/kernel/setup_percpu.c51
-rw-r--r--include/linux/percpu.h16
-rw-r--r--mm/percpu.c95
4 files changed, 84 insertions, 90 deletions
diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index a42a4a744d1..b03fd362c62 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -1478,9 +1478,10 @@ void __init setup_per_cpu_areas(void)
static struct vm_struct vm;
struct pcpu_alloc_info *ai;
unsigned long delta, cpu;
- size_t size_sum, pcpu_unit_size;
+ size_t size_sum;
size_t ptrs_size;
void **ptrs;
+ int rc;
ai = pcpu_alloc_alloc_info(1, nr_cpu_ids);
@@ -1526,14 +1527,15 @@ void __init setup_per_cpu_areas(void)
pcpu_map_range(start, end, virt_to_page(ptrs[cpu]));
}
- pcpu_unit_size = pcpu_setup_first_chunk(ai, vm.addr);
+ rc = pcpu_setup_first_chunk(ai, vm.addr);
+ if (rc)
+ panic("failed to setup percpu first chunk (%d)", rc);
free_bootmem(__pa(ptrs), ptrs_size);
delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
- for_each_possible_cpu(cpu) {
- __per_cpu_offset(cpu) = delta + cpu * pcpu_unit_size;
- }
+ for_each_possible_cpu(cpu)
+ __per_cpu_offset(cpu) = delta + pcpu_unit_offsets[cpu];
/* Setup %g5 for the boot cpu. */
__local_per_cpu_offset = __per_cpu_offset(smp_processor_id());
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index db5f9c49fec..9becc5d4b51 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -157,12 +157,12 @@ static int pcpu_lpage_cpu_distance(unsigned int from, unsigned int to)
return REMOTE_DISTANCE;
}
-static ssize_t __init setup_pcpu_lpage(bool chosen)
+static int __init setup_pcpu_lpage(bool chosen)
{
size_t reserve = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
size_t dyn_size = reserve - PERCPU_FIRST_CHUNK_RESERVE;
struct pcpu_alloc_info *ai;
- ssize_t ret;
+ int rc;
/* on non-NUMA, embedding is better */
if (!chosen && !pcpu_need_numa())
@@ -196,19 +196,18 @@ static ssize_t __init setup_pcpu_lpage(bool chosen)
if (tot_size > vm_size / 5) {
pr_info("PERCPU: too large chunk size %zuMB for "
"large page remap\n", tot_size >> 20);
- ret = -EINVAL;
+ rc = -EINVAL;
goto out_free;
}
}
- ret = pcpu_lpage_first_chunk(ai, pcpu_fc_alloc, pcpu_fc_free,
- pcpul_map);
+ rc = pcpu_lpage_first_chunk(ai, pcpu_fc_alloc, pcpu_fc_free, pcpul_map);
out_free:
pcpu_free_alloc_info(ai);
- return ret;
+ return rc;
}
#else
-static ssize_t __init setup_pcpu_lpage(bool chosen)
+static int __init setup_pcpu_lpage(bool chosen)
{
return -EINVAL;
}
@@ -222,7 +221,7 @@ static ssize_t __init setup_pcpu_lpage(bool chosen)
* mapping so that it can use PMD mapping without additional TLB
* pressure.
*/
-static ssize_t __init setup_pcpu_embed(bool chosen)
+static int __init setup_pcpu_embed(bool chosen)
{
size_t reserve = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
@@ -250,7 +249,7 @@ static void __init pcpup_populate_pte(unsigned long addr)
populate_extra_pte(addr);
}
-static ssize_t __init setup_pcpu_page(void)
+static int __init setup_pcpu_page(void)
{
return pcpu_page_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
pcpu_fc_alloc, pcpu_fc_free,
@@ -274,8 +273,7 @@ void __init setup_per_cpu_areas(void)
{
unsigned int cpu;
unsigned long delta;
- size_t pcpu_unit_size;
- ssize_t ret;
+ int rc;
pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n",
NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids);
@@ -285,36 +283,33 @@ void __init setup_per_cpu_areas(void)
* of large page mappings. Please read comments on top of
* each allocator for details.
*/
- ret = -EINVAL;
+ rc = -EINVAL;
if (pcpu_chosen_fc != PCPU_FC_AUTO) {
if (pcpu_chosen_fc != PCPU_FC_PAGE) {
if (pcpu_chosen_fc == PCPU_FC_LPAGE)
- ret = setup_pcpu_lpage(true);
+ rc = setup_pcpu_lpage(true);
else
- ret = setup_pcpu_embed(true);
+ rc = setup_pcpu_embed(true);
- if (ret < 0)
- pr_warning("PERCPU: %s allocator failed (%zd), "
+ if (rc < 0)
+ pr_warning("PERCPU: %s allocator failed (%d), "
"falling back to page size\n",
- pcpu_fc_names[pcpu_chosen_fc], ret);
+ pcpu_fc_names[pcpu_chosen_fc], rc);
}
} else {
- ret = setup_pcpu_lpage(false);
- if (ret < 0)
- ret = setup_pcpu_embed(false);
+ rc = setup_pcpu_lpage(false);
+ if (rc < 0)
+ rc = setup_pcpu_embed(false);
}
- if (ret < 0)
- ret = setup_pcpu_page();
- if (ret < 0)
- panic("cannot initialize percpu area (err=%zd)", ret);
-
- pcpu_unit_size = ret;
+ if (rc < 0)
+ rc = setup_pcpu_page();
+ if (rc < 0)
+ panic("cannot initialize percpu area (err=%d)", rc);
/* alrighty, percpu areas up and running */
delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
for_each_possible_cpu(cpu) {
- per_cpu_offset(cpu) =
- delta + pcpu_unit_map[cpu] * pcpu_unit_size;
+ per_cpu_offset(cpu) = delta + pcpu_unit_offsets[cpu];
per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu);
per_cpu(cpu_number, cpu) = cpu;
setup_percpu_segment(cpu);
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 77b86be8ce4..a7ec840f596 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -57,7 +57,7 @@
#endif
extern void *pcpu_base_addr;
-extern const int *pcpu_unit_map;
+extern const unsigned long *pcpu_unit_offsets;
struct pcpu_group_info {
int nr_units; /* aligned # of units */
@@ -106,25 +106,23 @@ extern struct pcpu_alloc_info * __init pcpu_build_alloc_info(
size_t atom_size,
pcpu_fc_cpu_distance_fn_t cpu_distance_fn);
-extern size_t __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
- void *base_addr);
+extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
+ void *base_addr);
#ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK
-extern ssize_t __init pcpu_embed_first_chunk(
- size_t reserved_size, ssize_t dyn_size);
+extern int __init pcpu_embed_first_chunk(size_t reserved_size,
+ ssize_t dyn_size);
#endif
#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
-extern ssize_t __init pcpu_page_first_chunk(
- size_t reserved_size,
+extern int __init pcpu_page_first_chunk(size_t reserved_size,
pcpu_fc_alloc_fn_t alloc_fn,
pcpu_fc_free_fn_t free_fn,
pcpu_fc_populate_pte_fn_t populate_pte_fn);
#endif
#ifdef CONFIG_NEED_PER_CPU_LPAGE_FIRST_CHUNK
-extern ssize_t __init pcpu_lpage_first_chunk(
- const struct pcpu_alloc_info *ai,
+extern int __init pcpu_lpage_first_chunk(const struct pcpu_alloc_info *ai,
pcpu_fc_alloc_fn_t alloc_fn,
pcpu_fc_free_fn_t free_fn,
pcpu_fc_map_fn_t map_fn);
diff --git a/mm/percpu.c b/mm/percpu.c
index 99f7fa68272..653b02c4020 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -117,8 +117,8 @@ static unsigned int pcpu_last_unit_cpu __read_mostly;
void *pcpu_base_addr __read_mostly;
EXPORT_SYMBOL_GPL(pcpu_base_addr);
-/* cpu -> unit map */
-const int *pcpu_unit_map __read_mostly;
+static const int *pcpu_unit_map __read_mostly; /* cpu -> unit */
+const unsigned long *pcpu_unit_offsets __read_mostly; /* cpu -> unit offset */
/*
* The first chunk which always exists. Note that unlike other
@@ -196,8 +196,8 @@ static int pcpu_page_idx(unsigned int cpu, int page_idx)
static unsigned long pcpu_chunk_addr(struct pcpu_chunk *chunk,
unsigned int cpu, int page_idx)
{
- return (unsigned long)chunk->vm->addr +
- (pcpu_page_idx(cpu, page_idx) << PAGE_SHIFT);
+ return (unsigned long)chunk->vm->addr + pcpu_unit_offsets[cpu] +
+ (page_idx << PAGE_SHIFT);
}
static struct page *pcpu_chunk_page(struct pcpu_chunk *chunk,
@@ -341,7 +341,7 @@ static struct pcpu_chunk *pcpu_chunk_addr_search(void *addr)
* space. Note that any possible cpu id can be used here, so
* there's no need to worry about preemption or cpu hotplug.
*/
- addr += pcpu_unit_map[smp_processor_id()] * pcpu_unit_size;
+ addr += pcpu_unit_offsets[smp_processor_id()];
return pcpu_get_page_chunk(vmalloc_to_page(addr));
}
@@ -1560,17 +1560,17 @@ static void pcpu_dump_alloc_info(const char *lvl,
* and available for dynamic allocation like any other chunks.
*
* RETURNS:
- * The determined pcpu_unit_size which can be used to initialize
- * percpu access.
+ * 0 on success, -errno on failure.
*/
-size_t __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
- void *base_addr)
+int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
+ void *base_addr)
{
static struct vm_struct first_vm;
static int smap[2], dmap[2];
size_t dyn_size = ai->dyn_size;
size_t size_sum = ai->static_size + ai->reserved_size + dyn_size;
struct pcpu_chunk *schunk, *dchunk = NULL;
+ unsigned long *unit_off;
unsigned int cpu;
int *unit_map;
int group, unit, i;
@@ -1587,8 +1587,9 @@ size_t __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
pcpu_dump_alloc_info(KERN_DEBUG, ai);
- /* determine number of units and verify and initialize pcpu_unit_map */
+ /* determine number of units and initialize unit_map and base */
unit_map = alloc_bootmem(nr_cpu_ids * sizeof(unit_map[0]));
+ unit_off = alloc_bootmem(nr_cpu_ids * sizeof(unit_off[0]));
for (cpu = 0; cpu < nr_cpu_ids; cpu++)
unit_map[cpu] = NR_CPUS;
@@ -1606,6 +1607,8 @@ size_t __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
BUG_ON(unit_map[cpu] != NR_CPUS);
unit_map[cpu] = unit + i;
+ unit_off[cpu] = gi->base_offset + i * ai->unit_size;
+
if (pcpu_first_unit_cpu == NR_CPUS)
pcpu_first_unit_cpu = cpu;
}
@@ -1617,6 +1620,7 @@ size_t __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
BUG_ON(unit_map[cpu] == NR_CPUS);
pcpu_unit_map = unit_map;
+ pcpu_unit_offsets = unit_off;
/* determine basic parameters */
pcpu_unit_pages = ai->unit_size >> PAGE_SHIFT;
@@ -1688,7 +1692,7 @@ size_t __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
/* we're done */
pcpu_base_addr = schunk->vm->addr;
- return pcpu_unit_size;
+ return 0;
}
const char *pcpu_fc_names[PCPU_FC_NR] __initdata = {
@@ -1748,16 +1752,15 @@ early_param("percpu_alloc", percpu_alloc_setup);
* size, the leftover is returned to the bootmem allocator.
*
* RETURNS:
- * The determined pcpu_unit_size which can be used to initialize
- * percpu access on success, -errno on failure.
+ * 0 on success, -errno on failure.
*/
-ssize_t __init pcpu_embed_first_chunk(size_t reserved_size, ssize_t dyn_size)
+int __init pcpu_embed_first_chunk(size_t reserved_size, ssize_t dyn_size)
{
struct pcpu_alloc_info *ai;
size_t size_sum, chunk_size;
void *base;
int unit;
- ssize_t ret;
+ int rc;
ai = pcpu_build_alloc_info(reserved_size, dyn_size, PAGE_SIZE, NULL);
if (IS_ERR(ai))
@@ -1773,7 +1776,7 @@ ssize_t __init pcpu_embed_first_chunk(size_t reserved_size, ssize_t dyn_size)
if (!base) {
pr_warning("PERCPU: failed to allocate %zu bytes for "
"embedding\n", chunk_size);
- ret = -ENOMEM;
+ rc = -ENOMEM;
goto out_free_ai;
}
@@ -1790,10 +1793,10 @@ ssize_t __init pcpu_embed_first_chunk(size_t reserved_size, ssize_t dyn_size)
PFN_DOWN(size_sum), base, ai->static_size, ai->reserved_size,
ai->dyn_size, ai->unit_size);
- ret = pcpu_setup_first_chunk(ai, base);
+ rc = pcpu_setup_first_chunk(ai, base);
out_free_ai:
pcpu_free_alloc_info(ai);
- return ret;
+ return rc;
}
#endif /* CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK ||
!CONFIG_HAVE_SETUP_PER_CPU_AREA */
@@ -1813,13 +1816,12 @@ out_free_ai:
* page-by-page into vmalloc area.
*
* RETURNS:
- * The determined pcpu_unit_size which can be used to initialize
- * percpu access on success, -errno on failure.
+ * 0 on success, -errno on failure.
*/
-ssize_t __init pcpu_page_first_chunk(size_t reserved_size,
- pcpu_fc_alloc_fn_t alloc_fn,
- pcpu_fc_free_fn_t free_fn,
- pcpu_fc_populate_pte_fn_t populate_pte_fn)
+int __init pcpu_page_first_chunk(size_t reserved_size,
+ pcpu_fc_alloc_fn_t alloc_fn,
+ pcpu_fc_free_fn_t free_fn,
+ pcpu_fc_populate_pte_fn_t populate_pte_fn)
{
static struct vm_struct vm;
struct pcpu_alloc_info *ai;
@@ -1827,8 +1829,7 @@ ssize_t __init pcpu_page_first_chunk(size_t reserved_size,
int unit_pages;
size_t pages_size;
struct page **pages;
- int unit, i, j;
- ssize_t ret;
+ int unit, i, j, rc;
snprintf(psize_str, sizeof(psize_str), "%luK", PAGE_SIZE >> 10);
@@ -1874,10 +1875,10 @@ ssize_t __init pcpu_page_first_chunk(size_t reserved_size,
populate_pte_fn(unit_addr + (i << PAGE_SHIFT));
/* pte already populated, the following shouldn't fail */
- ret = __pcpu_map_pages(unit_addr, &pages[unit * unit_pages],
- unit_pages);
- if (ret < 0)
- panic("failed to map percpu area, err=%zd\n", ret);
+ rc = __pcpu_map_pages(unit_addr, &pages[unit * unit_pages],
+ unit_pages);
+ if (rc < 0)
+ panic("failed to map percpu area, err=%d\n", rc);
/*
* FIXME: Archs with virtual cache should flush local
@@ -1896,17 +1897,17 @@ ssize_t __init pcpu_page_first_chunk(size_t reserved_size,
unit_pages, psize_str, vm.addr, ai->static_size,
ai->reserved_size, ai->dyn_size);
- ret = pcpu_setup_first_chunk(ai, vm.addr);
+ rc = pcpu_setup_first_chunk(ai, vm.addr);
goto out_free_ar;
enomem:
while (--j >= 0)
free_fn(page_address(pages[j]), PAGE_SIZE);
- ret = -ENOMEM;
+ rc = -ENOMEM;
out_free_ar:
free_bootmem(__pa(pages), pages_size);
pcpu_free_alloc_info(ai);
- return ret;
+ return rc;
}
#endif /* CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK */
@@ -1977,20 +1978,18 @@ static int __init pcpul_cpu_to_unit(int cpu, const struct pcpu_alloc_info *ai)
* pcpu_lpage_remapped().
*
* RETURNS:
- * The determined pcpu_unit_size which can be used to initialize
- * percpu access on success, -errno on failure.
+ * 0 on success, -errno on failure.
*/
-ssize_t __init pcpu_lpage_first_chunk(const struct pcpu_alloc_info *ai,
- pcpu_fc_alloc_fn_t alloc_fn,
- pcpu_fc_free_fn_t free_fn,
- pcpu_fc_map_fn_t map_fn)
+int __init pcpu_lpage_first_chunk(const struct pcpu_alloc_info *ai,
+ pcpu_fc_alloc_fn_t alloc_fn,
+ pcpu_fc_free_fn_t free_fn,
+ pcpu_fc_map_fn_t map_fn)
{
static struct vm_struct vm;
const size_t lpage_size = ai->atom_size;
size_t chunk_size, map_size;
unsigned int cpu;
- ssize_t ret;
- int i, j, unit, nr_units;
+ int i, j, unit, nr_units, rc;
nr_units = 0;
for (i = 0; i < ai->nr_groups; i++)
@@ -2070,7 +2069,7 @@ ssize_t __init pcpu_lpage_first_chunk(const struct pcpu_alloc_info *ai,
vm.addr, ai->static_size, ai->reserved_size, ai->dyn_size,
ai->unit_size);
- ret = pcpu_setup_first_chunk(ai, vm.addr);
+ rc = pcpu_setup_first_chunk(ai, vm.addr);
/*
* Sort pcpul_map array for pcpu_lpage_remapped(). Unmapped
@@ -2094,7 +2093,7 @@ ssize_t __init pcpu_lpage_first_chunk(const struct pcpu_alloc_info *ai,
while (pcpul_nr_lpages && !pcpul_map[pcpul_nr_lpages - 1].ptr)
pcpul_nr_lpages--;
- return ret;
+ return rc;
enomem:
for (i = 0; i < pcpul_nr_lpages; i++)
@@ -2166,21 +2165,21 @@ EXPORT_SYMBOL(__per_cpu_offset);
void __init setup_per_cpu_areas(void)
{
- ssize_t unit_size;
unsigned long delta;
unsigned int cpu;
+ int rc;
/*
* Always reserve area for module percpu variables. That's
* what the legacy allocator did.
*/
- unit_size = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
- PERCPU_DYNAMIC_RESERVE);
- if (unit_size < 0)
+ rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
+ PERCPU_DYNAMIC_RESERVE);
+ if (rc < 0)
panic("Failed to initialized percpu areas.");
delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
for_each_possible_cpu(cpu)
- __per_cpu_offset[cpu] = delta + cpu * unit_size;
+ __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
}
#endif /* CONFIG_HAVE_SETUP_PER_CPU_AREA */
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-12 00:22:18 +0000