+ percpu-remove-pcpu_alloc_size.patch added to mm-unstable branch

+ percpu-remove-pcpu_alloc_size.patch added to mm-unstable branch

[Andrew Morton]

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@qq.com>
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@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>
---

 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@qq.com are

percpu-remove-pcpu_alloc_size.patch