[PATCH 16/21] mm/percpu: add checks for the return value of memblock_alloc*()

Mike Rapoport
2019-01-16T13:44:16Z

Add panic() calls if memblock_alloc() returns NULL.

The panic() format duplicates the one used by memblock itself and in order
to avoid explosion with long parameters list replace open coded allocation
size calculations with a local variable.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
---
mm/percpu.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++--------------
1 file changed, 56 insertions(+), 17 deletions(-)

diff --git a/mm/percpu.c b/mm/percpu.c
index db86282..5998b03 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1086,6 +1086,7 @@ static struct pcpu_chunk * __init pcpu_alloc_first_chunk(unsigned long tmp_addr,
struct pcpu_chunk *chunk;
unsigned long aligned_addr, lcm_align;
int start_offset, offset_bits, region_size, region_bits;
+ size_t alloc_size;

/* region calculations */
aligned_addr = tmp_addr & PAGE_MASK;
@@ -1101,9 +1102,12 @@ static struct pcpu_chunk * __init pcpu_alloc_first_chunk(unsigned long tmp_addr,
region_size = ALIGN(start_offset + map_size, lcm_align);

/* allocate chunk */
- chunk = memblock_alloc(sizeof(struct pcpu_chunk) +
- BITS_TO_LONGS(region_size >> PAGE_SHIFT),
- SMP_CACHE_BYTES);
+ alloc_size = sizeof(struct pcpu_chunk) +
+ BITS_TO_LONGS(region_size >> PAGE_SHIFT);
+ chunk = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
+ if (!chunk)
+ panic("%s: Failed to allocate %zu bytes\n", __func__,
+ alloc_size);

INIT_LIST_HEAD(&chunk->list);

@@ -1114,12 +1118,25 @@ static struct pcpu_chunk * __init pcpu_alloc_first_chunk(unsigned long tmp_addr,
chunk->nr_pages = region_size >> PAGE_SHIFT;
region_bits = pcpu_chunk_map_bits(chunk);

- chunk->alloc_map = memblock_alloc(BITS_TO_LONGS(region_bits) * sizeof(chunk->alloc_map[0]),
- SMP_CACHE_BYTES);
- chunk->bound_map = memblock_alloc(BITS_TO_LONGS(region_bits + 1) * sizeof(chunk->bound_map[0]),
- SMP_CACHE_BYTES);
- chunk->md_blocks = memblock_alloc(pcpu_chunk_nr_blocks(chunk) * sizeof(chunk->md_blocks[0]),
- SMP_CACHE_BYTES);
+ alloc_size = BITS_TO_LONGS(region_bits) * sizeof(chunk->alloc_map[0]);
+ chunk->alloc_map = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
+ if (!chunk->alloc_map)
+ panic("%s: Failed to allocate %zu bytes\n", __func__,
+ alloc_size);
+
+ alloc_size + BITS_TO_LONGS(region_bits + 1) * sizeof(chunk->bound_map[0]);
+ chunk->bound_map = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
+ if (!chunk->bound_map)
+ panic("%s: Failed to allocate %zu bytes\n", __func__,
+ alloc_size);
+
+ alloc_size = pcpu_chunk_nr_blocks(chunk) * sizeof(chunk->md_blocks[0]);
+ chunk->md_blocks = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
+ if (!chunk->md_blocks)
+ panic("%s: Failed to allocate %zu bytes\n", __func__,
+ alloc_size);
+
pcpu_init_md_blocks(chunk);

/* manage populated page bitmap */
@@ -2044,6 +2061,7 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
int group, unit, i;
int map_size;
unsigned long tmp_addr;
+ size_t alloc_size;

#define PCPU_SETUP_BUG_ON(cond) do { \
if (unlikely(cond)) { \
@@ -2075,14 +2093,29 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
PCPU_SETUP_BUG_ON(pcpu_verify_alloc_info(ai) < 0);

/* process group information and build config tables accordingly */
- group_offsets = memblock_alloc(ai->nr_groups * sizeof(group_offsets[0]),
- SMP_CACHE_BYTES);
- group_sizes = memblock_alloc(ai->nr_groups * sizeof(group_sizes[0]),
- SMP_CACHE_BYTES);
- unit_map = memblock_alloc(nr_cpu_ids * sizeof(unit_map[0]),
- SMP_CACHE_BYTES);
- unit_off = memblock_alloc(nr_cpu_ids * sizeof(unit_off[0]),
- SMP_CACHE_BYTES);
+ alloc_size = ai->nr_groups * sizeof(group_offsets[0]);
+ group_offsets = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
+ if (!group_offsets)
+ panic("%s: Failed to allocate %zu bytes\n", __func__,
+ alloc_size);
+
+ alloc_size = ai->nr_groups * sizeof(group_sizes[0]);
+ group_sizes = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
+ if (!group_sizes)
+ panic("%s: Failed to allocate %zu bytes\n", __func__,
+ alloc_size);
+
+ alloc_size = nr_cpu_ids * sizeof(unit_map[0]);
+ unit_map = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
+ if (!unit_map)
+ panic("%s: Failed to allocate %zu bytes\n", __func__,
+ alloc_size);
+
+ alloc_size = nr_cpu_ids * sizeof(unit_off[0]);
+ unit_off = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
+ if (!unit_off)
+ panic("%s: Failed to allocate %zu bytes\n", __func__,
+ alloc_size);

for (cpu = 0; cpu < nr_cpu_ids; cpu++)
unit_map[cpu] = UINT_MAX;
@@ -2148,6 +2181,9 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
pcpu_nr_slots = __pcpu_size_to_slot(pcpu_unit_size) + 2;
pcpu_slot = memblock_alloc(pcpu_nr_slots * sizeof(pcpu_slot[0]),
SMP_CACHE_BYTES);
+ if (!pcpu_slot)
+ panic("%s: Failed to allocate %zu bytes\n", __func__,
+ pcpu_nr_slots * sizeof(pcpu_slot[0]));
for (i = 0; i < pcpu_nr_slots; i++)
INIT_LIST_HEAD(&pcpu_slot[i]);

@@ -2602,6 +2638,9 @@ int __init pcpu_page_first_chunk(size_t reserved_size,
pages_size = PFN_ALIGN(unit_pages * num_possible_cpus() *
sizeof(pages[0]));
pages = memblock_alloc(pages_size, SMP_CACHE_BYTES);
+ if (!pages)
+ panic("%s: Failed to allocate %zu bytes\n", __func__,
+ pages_size);

/* allocate pages */
j = 0;
--
2.7.4