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Code Issues Releases Wiki Activity

lib/alloc_tag: do not register sysctl interface when CONFIG_SYSCTL=n

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Memory allocation profiling is trying to register sysctl interface even
when CONFIG_SYSCTL=n, resulting in proc_do_static_key() being undefined. 
Prevent that by skipping sysctl registration for such configurations.

Link: https://lkml.kernel.org/r/20240601233831.617124-1-surenb@google.com
Fixes: 22d407b164 ("lib: add allocation tagging support for memory allocation profiling")
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202405280616.wcOGWJEj-lkp@intel.com/
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Kees Cook <keescook@chromium.org>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Suren Baghdasaryan 2024-06-01 16:38:31 -07:00 committed by Andrew Morton
parent 3ab85f4046
commit c944bf60c1
1 changed files with 13 additions and 3 deletions
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16
lib/alloc_tag.c
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@ -227,6 +227,7 @@ struct page_ext_operations page_alloc_tagging_ops = {
};
EXPORT_SYMBOL(page_alloc_tagging_ops);
#ifdef CONFIG_SYSCTL
static struct ctl_table memory_allocation_profiling_sysctls[] = {
{
.procname = "mem_profiling",
@ -241,6 +242,17 @@ static struct ctl_table memory_allocation_profiling_sysctls[] = {
{ }
};
static void __init sysctl_init(void)
{
if (!mem_profiling_support)
memory_allocation_profiling_sysctls[0].mode = 0444;
register_sysctl_init("vm", memory_allocation_profiling_sysctls);
}
#else /* CONFIG_SYSCTL */
static inline void sysctl_init(void) {}
#endif /* CONFIG_SYSCTL */
static int __init alloc_tag_init(void)
{
const struct codetag_type_desc desc = {
@ -253,9 +265,7 @@ static int __init alloc_tag_init(void)
if (IS_ERR(alloc_tag_cttype))
return PTR_ERR(alloc_tag_cttype);
if (!mem_profiling_support)
memory_allocation_profiling_sysctls[0].mode = 0444;
register_sysctl_init("vm", memory_allocation_profiling_sysctls);
sysctl_init();
procfs_init();
return 0;