The patch titled
Subject: percpu: remove pcpu_alloc_size()
has been added to the -mm mm-unstable branch. Its filename is
percpu-remove-pcpu_alloc_size.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/percpu-remove-pcpu_alloc_size.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Jianhui Zhou <912460177@xxxxxx>
Subject: percpu: remove pcpu_alloc_size()
Date: Wed, 7 Aug 2024 15:44:48 +0800
pcpu_alloc_size() was added in 7ac5c53e0073 "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@xxxxxx
Signed-off-by: Jianhui Zhou <912460177@xxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Dennis Zhou <dennis@xxxxxxxxxx>
Cc: JonasZhou <JonasZhou@xxxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/percpu.h | 1 -
mm/percpu.c | 31 -------------------------------
2 files changed, 32 deletions(-)
--- a/include/linux/percpu.h~percpu-remove-pcpu_alloc_size
+++ a/include/linux/percpu.h
@@ -135,7 +135,6 @@ extern void __init setup_per_cpu_areas(v
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))
--- a/mm/percpu.c~percpu-remove-pcpu_alloc_size
+++ a/mm/percpu.c
@@ -2217,37 +2217,6 @@ static void pcpu_balance_workfn(struct w
}
/**
- * 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
*
_
Patches currently in -mm which might be from 912460177@xxxxxx are
percpu-remove-pcpu_alloc_size.patch
