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Do not create the x86/init_pkru debugfs file if the CPU doesn't support PKRU. 

Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-mm-2021-06-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 mm update from Ingo Molnar:
 "Do not create the x86/init_pkru debugfs file if the CPU doesn't
  support PKRU"

* tag 'x86-mm-2021-06-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/pkeys: Skip 'init_pkru' debugfs file creation when pkeys not supported
This commit is contained in:
Linus Torvalds 2021-06-28 13:27:46 -07:00
parent e98e8864b0 314a1e1eab
commit 5f498328a9
1 changed files with 4 additions and 0 deletions
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4
arch/x86/mm/pkeys.c
View File

@ -192,6 +192,10 @@ static const struct file_operations fops_init_pkru = {
static int __init create_init_pkru_value(void)
{
/* Do not expose the file if pkeys are not supported. */
if (!cpu_feature_enabled(X86_FEATURE_OSPKE))
return 0;
debugfs_create_file("init_pkru", S_IRUSR | S_IWUSR,
arch_debugfs_dir, NULL, &fops_init_pkru);
return 0;