linux-kernel - mm: percpu: increase PERCPU_MODULE_RESERVE to avoid allocation failure

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Message-ID: <bcfb90b2cecf43d7a0760ebaddde10d8@honor.com>
Date: Tue, 22 Apr 2025 11:39:30 +0000
From: gaoxu <gaoxu2@...or.com>
To: Andrew Morton <akpm@...ux-foundation.org>, Dennis Zhou
	<dennis@...nel.org>, Tejun Heo <tj@...nel.org>, Christoph Lameter
	<cl@...ux.com>
CC: "linux-mm@...ck.org" <linux-mm@...ck.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "surenb@...gle.com" <surenb@...gle.com>,
	yipengxiang <yipengxiang@...or.com>, gaoxu <gaoxu2@...or.com>
Subject: mm: percpu: increase PERCPU_MODULE_RESERVE to avoid allocation
 failure

In android16-6.12, enabling CONFIG_MEM_ALLOC_PROFILING causes some modules
to fail to load during boot because of failed percpu memory allocation.

[811:modprobe]percpu: allocation failed, size=5200 align=8 atomic=0, alloc
from reserved chunk failed
[811:modprobe]Call trace:
[811:modprobe] dump_backtrace+0xfc/0x17c
[811:modprobe] show_stack+0x18/0x28
[811:modprobe] dump_stack_lvl+0x40/0xc0
[811:modprobe] dump_stack+0x18/0x24
[811:modprobe] pcpu_alloc_noprof+0x96c/0xb58
[811:modprobe] percpu_modalloc+0x50/0xec
[811:modprobe] load_module+0x1158/0x153c
[811:modprobe] __arm64_sys_finit_module+0x23c/0x340
[811:modprobe] invoke_syscall+0x58/0x10c
[811:modprobe] el0_svc_common+0xa8/0xdc
[811:modprobe] do_el0_svc+0x1c/0x28
[811:modprobe] el0_svc+0x40/0x90
[811:modprobe] el0t_64_sync_handler+0x70/0xbc
[811:modprobe] el0t_64_sync+0x1a8/0x1ac
[811:modprobe]ipam: Could not allocate 5200 bytes percpu data

Increase PERCPU_MODULE_RESERVE to resolve this issue.

Signed-off-by: gao xu <gaoxu2@...or.com>
---
 include/linux/percpu.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 52b5ea663..765c7f562 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -16,7 +16,7 @@
 /* enough to cover all DEFINE_PER_CPUs in modules */
 #ifdef CONFIG_MODULES
 #ifdef CONFIG_MEM_ALLOC_PROFILING
-#define PERCPU_MODULE_RESERVE		(8 << 13)
+#define PERCPU_MODULE_RESERVE		(8 << 14)
 #else
 #define PERCPU_MODULE_RESERVE		(8 << 10)
 #endif
-- 
2.17.1