The patch titled
Subject: kmemleak: always register debugfs file
has been added to the -mm tree. Its filename is
kmemleak-always-register-debugfs-file.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kmemleak-always-register-debugfs-file.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kmemleak-always-register-debugfs-file.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Vincent Whitchurch <vincent.whitchurch@xxxxxxxx>
Subject: kmemleak: always register debugfs file
If kmemleak built in to the kernel, but is disabled by default, the
debugfs file is never registered. Because of this, it is not possible to
find out if the kernel is built with kmemleak support by checking for the
presence of this file. To allow this, always register the file.
After this patch, if the file doesn't exist, kmemleak is not available in
the kernel. If writing "scan" or any other value than "clear" to this
file results in EBUSY, then kmemleak is available but is disabled by
default and can be activated via the kernel command line.
Catalin: "that's also consistent with a late disabling of kmemleak when
the debugfs entry sticks around."
Link: http://lkml.kernel.org/r/20180824131220.19176-1-vincent.whitchurch@xxxxxxxx
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@xxxxxxxx>
Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kmemleak.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
--- a/mm/kmemleak.c~kmemleak-always-register-debugfs-file
+++ a/mm/kmemleak.c
@@ -2097,6 +2097,11 @@ static int __init kmemleak_late_init(voi
kmemleak_initialized = 1;
+ dentry = debugfs_create_file("kmemleak", 0644, NULL, NULL,
+ &kmemleak_fops);
+ if (!dentry)
+ pr_warn("Failed to create the debugfs kmemleak file\n");
+
if (kmemleak_error) {
/*
* Some error occurred and kmemleak was disabled. There is a
@@ -2108,10 +2113,6 @@ static int __init kmemleak_late_init(voi
return -ENOMEM;
}
- dentry = debugfs_create_file("kmemleak", 0644, NULL, NULL,
- &kmemleak_fops);
- if (!dentry)
- pr_warn("Failed to create the debugfs kmemleak file\n");
mutex_lock(&scan_mutex);
start_scan_thread();
mutex_unlock(&scan_mutex);
_
Patches currently in -mm which might be from vincent.whitchurch@xxxxxxxx are
kmemleak-always-register-debugfs-file.patch
