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| author | YueHaibing <yuehaibing@huawei.com> | 2019-03-08 03:26:36 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-03-08 05:31:59 +0300 |
| commit | 4169680e9f7cdbf893f8885611b3235aeda94224 (patch) | |
| tree | 872f4d1ec79495af4f8d0739b78b4a69c1ba80ca /kernel/panic.c | |
| parent | c461aed3a423dda442aad38047c3f2bb0f9e2012 (diff) | |
| download | linux-4169680e9f7cdbf893f8885611b3235aeda94224.tar.xz | |
kernel/panic.c: taint: fix debugfs_simple_attr.cocci warnings
Use DEFINE_DEBUGFS_ATTRIBUTE rather than DEFINE_SIMPLE_ATTRIBUTE for
debugfs files.
Semantic patch information:
Rationale: DEFINE_SIMPLE_ATTRIBUTE + debugfs_create_file()
imposes some significant overhead as compared to
DEFINE_DEBUGFS_ATTRIBUTE + debugfs_create_file_unsafe().
Generated by: scripts/coccinelle/api/debugfs/debugfs_simple_attr.cocci
The _unsafe() part suggests that some of them "safeness
responsibilities" are now panic.c responsibilities. The patch is OK
since panic's clear_warn_once_fops struct file_operations is safe
against removal, so we don't have to use otherwise necessary
debugfs_file_get()/debugfs_file_put().
[sergey.senozhatsky.work@gmail.com: changelog addition]
Link: http://lkml.kernel.org/r/1545990861-158097-1-git-send-email-yuehaibing@huawei.com
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Petr Mladek <pmladek@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/panic.c')
| -rw-r--r-- | kernel/panic.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/kernel/panic.c b/kernel/panic.c index f121e6ba7e11..0ae0d7332f12 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -642,16 +642,14 @@ static int clear_warn_once_set(void *data, u64 val) return 0; } -DEFINE_SIMPLE_ATTRIBUTE(clear_warn_once_fops, - NULL, - clear_warn_once_set, - "%lld\n"); +DEFINE_DEBUGFS_ATTRIBUTE(clear_warn_once_fops, NULL, clear_warn_once_set, + "%lld\n"); static __init int register_warn_debugfs(void) { /* Don't care about failure */ - debugfs_create_file("clear_warn_once", 0200, NULL, - NULL, &clear_warn_once_fops); + debugfs_create_file_unsafe("clear_warn_once", 0200, NULL, NULL, + &clear_warn_once_fops); return 0; } |