The following commit has been merged into the locking/core branch of tip: Commit-ID: e36299efe7d749976fbdaaf756dee6ef32543c2c Gitweb: https://git.kernel.org/tip/e36299efe7d749976fbdaaf756dee6ef32543c2c Author: Marco Elver <elver@xxxxxxxxxx> AuthorDate: Wed, 03 Mar 2021 10:38:45 +01:00 Committer: Paul E. McKenney <paulmck@xxxxxxxxxx> CommitterDate: Mon, 08 Mar 2021 14:27:43 -08:00 kcsan, debugfs: Move debugfs file creation out of early init Commit 56348560d495 ("debugfs: do not attempt to create a new file before the filesystem is initalized") forbids creating new debugfs files until debugfs is fully initialized. This means that KCSAN's debugfs file creation, which happened at the end of __init(), no longer works. And was apparently never supposed to work! However, there is no reason to create KCSAN's debugfs file so early. This commit therefore moves its creation to a late_initcall() callback. Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx> Cc: stable <stable@xxxxxxxxxxxxxxx> Fixes: 56348560d495 ("debugfs: do not attempt to create a new file before the filesystem is initalized") Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Marco Elver <elver@xxxxxxxxxx> Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx> --- kernel/kcsan/core.c | 2 -- kernel/kcsan/debugfs.c | 4 +++- kernel/kcsan/kcsan.h | 5 ----- 3 files changed, 3 insertions(+), 8 deletions(-) diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c index 3bf98db..23e7acb 100644 --- a/kernel/kcsan/core.c +++ b/kernel/kcsan/core.c @@ -639,8 +639,6 @@ void __init kcsan_init(void) BUG_ON(!in_task()); - kcsan_debugfs_init(); - for_each_possible_cpu(cpu) per_cpu(kcsan_rand_state, cpu) = (u32)get_cycles(); diff --git a/kernel/kcsan/debugfs.c b/kernel/kcsan/debugfs.c index 3c8093a..209ad8d 100644 --- a/kernel/kcsan/debugfs.c +++ b/kernel/kcsan/debugfs.c @@ -261,7 +261,9 @@ static const struct file_operations debugfs_ops = .release = single_release }; -void __init kcsan_debugfs_init(void) +static void __init kcsan_debugfs_init(void) { debugfs_create_file("kcsan", 0644, NULL, NULL, &debugfs_ops); } + +late_initcall(kcsan_debugfs_init); diff --git a/kernel/kcsan/kcsan.h b/kernel/kcsan/kcsan.h index 8d4bf34..87ccdb3 100644 --- a/kernel/kcsan/kcsan.h +++ b/kernel/kcsan/kcsan.h @@ -31,11 +31,6 @@ void kcsan_save_irqtrace(struct task_struct *task); void kcsan_restore_irqtrace(struct task_struct *task); /* - * Initialize debugfs file. - */ -void kcsan_debugfs_init(void); - -/* * Statistics counters displayed via debugfs; should only be modified in * slow-paths. */
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