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percpu: remove pcpu_alloc_size()

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pcpu_alloc_size() was added in 7ac5c53e00 "mm/percpu.c: introduce
pcpu_alloc_size()", which is used to get the allocated memory size in bpf.
However, pcpu_alloc_size() is no longer used in "bpf: Use c->unit_size to
select target cache during free" because its actuall allocated memory size
may change at runtime due to its slab merging mechanism.  Therefore,
pcpu_alloc_size() can be removed.

Link: https://lkml.kernel.org/r/tencent_AD5C50E8D78C07A3CE539BD5F6BF39706507@qq.com
Signed-off-by: Jianhui Zhou <912460177@qq.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: JonasZhou <JonasZhou@zhaoxin.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jianhui Zhou 2024-08-07 15:44:48 +08:00 committed by Andrew Morton
parent 43c9074e6f
commit 47baed6a13
2 changed files with 0 additions and 32 deletions
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1
include/linux/percpu.h
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@ -135,7 +135,6 @@ extern void __init setup_per_cpu_areas(void);
extern void __percpu *pcpu_alloc_noprof(size_t size, size_t align, bool reserved,
gfp_t gfp) __alloc_size(1);
extern size_t pcpu_alloc_size(void __percpu *__pdata);
#define __alloc_percpu_gfp(_size, _align, _gfp) \
alloc_hooks(pcpu_alloc_noprof(_size, _align, false, _gfp))

31
mm/percpu.c
View File

@ -2216,37 +2216,6 @@ static void pcpu_balance_workfn(struct work_struct *work)
mutex_unlock(&pcpu_alloc_mutex);
}
/**
* pcpu_alloc_size - the size of the dynamic percpu area
* @ptr: pointer to the dynamic percpu area
*
* Returns the size of the @ptr allocation. This is undefined for statically
* defined percpu variables as there is no corresponding chunk->bound_map.
*
* RETURNS:
* The size of the dynamic percpu area.
*
* CONTEXT:
* Can be called from atomic context.
*/
size_t pcpu_alloc_size(void __percpu *ptr)
{
struct pcpu_chunk *chunk;
unsigned long bit_off, end;
void *addr;
if (!ptr)
return 0;
addr = __pcpu_ptr_to_addr(ptr);
/* No pcpu_lock here: ptr has not been freed, so chunk is still alive */
chunk = pcpu_chunk_addr_search(addr);
bit_off = (addr - chunk->base_addr) / PCPU_MIN_ALLOC_SIZE;
end = find_next_bit(chunk->bound_map, pcpu_chunk_map_bits(chunk),
bit_off + 1);
return (end - bit_off) * PCPU_MIN_ALLOC_SIZE;
}
/**
* free_percpu - free percpu area
* @ptr: pointer to area to free