Commit 3f5ebb1c authored by Ma Wupeng's avatar Ma Wupeng Committed by Wang Wensheng
Browse files

mm: Introduce reliable_debug=S to control shmem use mirrored memory 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4SK3S


CVE: NA

--------------------------------

Introduce reliable_debug=S to control shmem use mirrored memory.

Signed-off-by: default avatarMa Wupeng <mawupeng1@huawei.com>
Reviewed-by: default avatarKefeng Wang <wangkefeng.wang@huawei.com>
parent f30c7817

Documentation/admin-guide/kernel-parameters.txt

+2 −1
Original line number Diff line number Diff line
@@ -4786,11 +4786,12 @@ 
			See Documentation/admin-guide/cgroup-v1/cpusets.rst.



	reliable_debug=	[ARM64]

			Format: [F][,P]

			Format: [F][,S][,P]

			Only works with CONFIG_MEMORY_RELIABLE and

			"kernelcore=reliable" is configured.

			F: User memory allocation(special user task, tmpfs) will

			not allocate memory from non-mirrored region if failed.

			S: The shmem does not use the reliable memory.

			P: Page cache does not use the reliable memory.



	reserve=	[KNL,BUGS] Force kernel to ignore I/O ports or memory

mm/mem_reliable.c

+4 −0
Original line number Diff line number Diff line
@@ -345,6 +345,10 @@ static int __init setup_reliable_debug(char *str) 
			reliable_allow_fallback = false;

			pr_info("disable memory reliable fallback\n");

			break;

		case 'S':

			shmem_reliable = false;

			pr_info("disable shmem use reliable memory\n");

			break;

		case 'P':

			pagecache_use_reliable_mem = false;

			pr_info("disable page cache use reliable memory\n");