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alloc_tag: check mem_profiling_support in alloc_tag_init

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If mem_profiling_support is false, for example by
sysctl.vm.mem_profiling=never, alloc_tag_init should skip module tags
allocation, codetag type registration and procfs init.

Link: https://lkml.kernel.org/r/20250513182602.121843-1-cachen@purestorage.com
Signed-off-by: Casey Chen <cachen@purestorage.com>
Reviewed-by: Yuanyuan Zhong <yzhong@purestorage.com>
Acked-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Casey Chen 2025-05-13 12:26:02 -06:00 committed by Andrew Morton
parent 6a4b3551ba
commit 780138b123
1 changed files with 19 additions and 15 deletions
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34
lib/alloc_tag.c
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@ -244,17 +244,6 @@ static void shutdown_mem_profiling(bool remove_file)
mem_profiling_support = false; mem_profiling_support = false;
} }
static void __init procfs_init(void)
{
if (!mem_profiling_support)
return;
if (!proc_create_seq(ALLOCINFO_FILE_NAME, 0400, NULL, &allocinfo_seq_op)) {
pr_err("Failed to create %s file\n", ALLOCINFO_FILE_NAME);
shutdown_mem_profiling(false);
}
}
void __init alloc_tag_sec_init(void) void __init alloc_tag_sec_init(void)
{ {
struct alloc_tag *last_codetag; struct alloc_tag *last_codetag;
@ -762,19 +751,34 @@ static int __init alloc_tag_init(void)
}; };
int res; int res;
sysctl_init();
if (!mem_profiling_support) {
pr_info("Memory allocation profiling is not supported!\n");
return 0;
}
if (!proc_create_seq(ALLOCINFO_FILE_NAME, 0400, NULL, &allocinfo_seq_op)) {
pr_err("Failed to create %s file\n", ALLOCINFO_FILE_NAME);
shutdown_mem_profiling(false);
return -ENOMEM;
}
res = alloc_mod_tags_mem(); res = alloc_mod_tags_mem();
if (res) if (res) {
pr_err("Failed to reserve address space for module tags, errno = %d\n", res);
shutdown_mem_profiling(true);
return res; return res;
}
alloc_tag_cttype = codetag_register_type(&desc); alloc_tag_cttype = codetag_register_type(&desc);
if (IS_ERR(alloc_tag_cttype)) { if (IS_ERR(alloc_tag_cttype)) {
pr_err("Allocation tags registration failed, errno = %ld\n", PTR_ERR(alloc_tag_cttype));
free_mod_tags_mem(); free_mod_tags_mem();
shutdown_mem_profiling(true);
return PTR_ERR(alloc_tag_cttype); return PTR_ERR(alloc_tag_cttype);
} }
sysctl_init();
procfs_init();
return 0; return 0;
} }
module_init(alloc_tag_init); module_init(alloc_tag_init);