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Merge branch 'for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu

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Pull percpu updates from Dennis Zhou:
 "A couple of updates to clean up the code with no change in behavior"

* 'for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu:
  percpu: Use struct_size() helper
  percpu: fix typo in pcpu_setup_first_chunk() comment
  percpu: Make pcpu_setup_first_chunk() void function
This commit is contained in:
Linus Torvalds 2019-09-17 15:58:50 -07:00
commit 1902314157
4 changed files with 12 additions and 23 deletions
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5
arch/ia64/mm/contig.c
View File

@ -134,10 +134,7 @@ setup_per_cpu_areas(void)
ai->atom_size = PAGE_SIZE;
ai->alloc_size = PERCPU_PAGE_SIZE;
rc = pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]);
if (rc)
panic("failed to setup percpu area (err=%d)", rc);
pcpu_setup_first_chunk(ai, __per_cpu_start + __per_cpu_offset[0]);
pcpu_free_alloc_info(ai);
}
#else

5
arch/ia64/mm/discontig.c
View File

@ -245,10 +245,7 @@ void __init setup_per_cpu_areas(void)
gi->cpu_map = &cpu_map[unit];
}
rc = pcpu_setup_first_chunk(ai, base);
if (rc)
panic("failed to setup percpu area (err=%d)", rc);
pcpu_setup_first_chunk(ai, base);
pcpu_free_alloc_info(ai);
}
#endif

2
include/linux/percpu.h
View File

@ -105,7 +105,7 @@ extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
int nr_units);
extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);
extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
extern void __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
void *base_addr);
#ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK

23
mm/percpu.c
View File

@ -2125,7 +2125,7 @@ struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
void *ptr;
int unit;
base_size = ALIGN(sizeof(*ai) + nr_groups * sizeof(ai->groups[0]),
base_size = ALIGN(struct_size(ai, groups, nr_groups),
__alignof__(ai->groups[0].cpu_map[0]));
ai_size = base_size + nr_units * sizeof(ai->groups[0].cpu_map[0]);
@ -2220,7 +2220,7 @@ static void pcpu_dump_alloc_info(const char *lvl,
* @base_addr: mapped address
*
* Initialize the first percpu chunk which contains the kernel static
* perpcu area. This function is to be called from arch percpu area
* percpu area. This function is to be called from arch percpu area
* setup path.
*
* @ai contains all information necessary to initialize the first
@ -2267,12 +2267,9 @@ static void pcpu_dump_alloc_info(const char *lvl,
* share the same vm, but use offset regions in the area allocation map.
* The chunk serving the dynamic region is circulated in the chunk slots
* and available for dynamic allocation like any other chunk.
*
* RETURNS:
* 0 on success, -errno on failure.
*/
int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
void *base_addr)
void __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
void *base_addr)
{
size_t size_sum = ai->static_size + ai->reserved_size + ai->dyn_size;
size_t static_size, dyn_size;
@ -2457,7 +2454,6 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
/* we're done */
pcpu_base_addr = base_addr;
return 0;
}
#ifdef CONFIG_SMP
@ -2710,7 +2706,7 @@ int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
struct pcpu_alloc_info *ai;
size_t size_sum, areas_size;
unsigned long max_distance;
int group, i, highest_group, rc;
int group, i, highest_group, rc = 0;
ai = pcpu_build_alloc_info(reserved_size, dyn_size, atom_size,
cpu_distance_fn);
@ -2795,7 +2791,7 @@ int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
PFN_DOWN(size_sum), ai->static_size, ai->reserved_size,
ai->dyn_size, ai->unit_size);
rc = pcpu_setup_first_chunk(ai, base);
pcpu_setup_first_chunk(ai, base);
goto out_free;
out_free_areas:
@ -2839,7 +2835,7 @@ int __init pcpu_page_first_chunk(size_t reserved_size,
int unit_pages;
size_t pages_size;
struct page **pages;
int unit, i, j, rc;
int unit, i, j, rc = 0;
int upa;
int nr_g0_units;
@ -2920,7 +2916,7 @@ int __init pcpu_page_first_chunk(size_t reserved_size,
unit_pages, psize_str, ai->static_size,
ai->reserved_size, ai->dyn_size);
rc = pcpu_setup_first_chunk(ai, vm.addr);
pcpu_setup_first_chunk(ai, vm.addr);
goto out_free_ar;
enomem:
@ -3014,8 +3010,7 @@ void __init setup_per_cpu_areas(void)
ai->groups[0].nr_units = 1;
ai->groups[0].cpu_map[0] = 0;
if (pcpu_setup_first_chunk(ai, fc) < 0)
panic("Failed to initialize percpu areas.");
pcpu_setup_first_chunk(ai, fc);
pcpu_free_alloc_info(ai);
}