diff options
| -rw-r--r-- | lib/alloc_tag.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c index 715315f5d9ba..f79217427d81 100644 --- a/lib/alloc_tag.c +++ b/lib/alloc_tag.c @@ -766,6 +766,20 @@ struct page_ext_operations page_alloc_tagging_ops = { EXPORT_SYMBOL(page_alloc_tagging_ops); #ifdef CONFIG_SYSCTL +/* + * Not using proc_do_static_key() directly to prevent enabling profiling + * after it was shut down. + */ +static int proc_mem_profiling_handler(const struct ctl_table *table, int write, + void *buffer, size_t *lenp, loff_t *ppos) +{ + if (!mem_profiling_support && write) + return -EINVAL; + + return proc_do_static_key(table, write, buffer, lenp, ppos); +} + + static struct ctl_table memory_allocation_profiling_sysctls[] = { { .procname = "mem_profiling", @@ -775,7 +789,7 @@ static struct ctl_table memory_allocation_profiling_sysctls[] = { #else .mode = 0644, #endif - .proc_handler = proc_do_static_key, + .proc_handler = proc_mem_profiling_handler, }, }; |