From: zijun_hu <zijun_hu@xxxxxxx>
correct max_distance from (base of the highest group + ai->unit_size)
to (base of the highest group + the group size)
Signed-off-by: zijun_hu <zijun_hu@xxxxxxx>
---
mm/percpu.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/mm/percpu.c b/mm/percpu.c
index fcaaac977954..ee0d1c93f070 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1963,7 +1963,8 @@ int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
void *base = (void *)ULONG_MAX;
void **areas = NULL;
struct pcpu_alloc_info *ai;
- size_t size_sum, areas_size, max_distance;
+ size_t size_sum, areas_size;
+ unsigned long max_distance;
int group, i, rc;
ai = pcpu_build_alloc_info(reserved_size, dyn_size, atom_size,
@@ -2025,17 +2026,18 @@ int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
}
/* base address is now known, determine group base offsets */
- max_distance = 0;
+ i = 0;
for (group = 0; group < ai->nr_groups; group++) {
ai->groups[group].base_offset = areas[group] - base;
- max_distance = max_t(size_t, max_distance,
- ai->groups[group].base_offset);
+ if (areas[group] > areas[i])
+ i = group;
}
- max_distance += ai->unit_size;
+ max_distance = ai->groups[i].base_offset +
+ (unsigned long)ai->unit_size * ai->groups[i].nr_units;
/* warn if maximum distance is further than 75% of vmalloc space */
if (max_distance > VMALLOC_TOTAL * 3 / 4) {
- pr_warn("max_distance=0x%zx too large for vmalloc space 0x%lx\n",
+ pr_warn("max_distance=0x%lx too large for vmalloc space 0x%lx\n",
max_distance, VMALLOC_TOTAL);
#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
/* and fail if we have fallback */
--
1.9.1
--
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