From f278809475f6835b56de78b28dc2cc0c7e2c20a4 Mon Sep 17 00:00:00 2001 From: Aaron Thompson Date: Thu, 20 Nov 2025 10:26:33 +0000 Subject: debugfs: Remove broken no-mount mode debugfs access modes were added in Linux 5.10 (Dec 2020) [1], but the no-mount mode has behaved effectively the same as the off mode since Linux 5.12 (Apr 2021) [2]. The only difference is the specific error code returned by the debugfs_create_* functions, which is -ENOENT in no-mount mode and -EPERM in off mode. Given that no-mount hasn't worked for several years with no complaints, just remove it. [1] a24c6f7bc923 ("debugfs: Add access restriction option") [2] bc6de804d36b ("debugfs: be more robust at handling improper input in debugfs_lookup()") 56348560d495 ("debugfs: do not attempt to create a new file before the filesystem is initalized") Signed-off-by: Aaron Thompson Link: https://patch.msgid.link/20251120102222.18371-3-dev@null.aaront.org Signed-off-by: Greg Kroah-Hartman --- lib/Kconfig.debug | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) (limited to 'lib') diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 3034e294d50d..d9ab42916143 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -679,7 +679,7 @@ choice help This selects the default access restrictions for debugfs. It can be overridden with kernel command line option - debugfs=[on,no-mount,off]. The restrictions apply for API access + debugfs=[on,off]. The restrictions apply for API access and filesystem registration. config DEBUG_FS_ALLOW_ALL @@ -688,13 +688,6 @@ config DEBUG_FS_ALLOW_ALL No restrictions apply. Both API and filesystem registration is on. This is the normal default operation. -config DEBUG_FS_DISALLOW_MOUNT - bool "Do not register debugfs as filesystem" - help - The API is open but filesystem is not loaded. Clients can still do - their work and read with debug tools that do not need - debugfs filesystem. - config DEBUG_FS_ALLOW_NONE bool "No access" help -- cgit v1.2.3