From: Anand K Mistry <amistry@google.com>
To: linux-kernel@vger.kernel.org
Cc: Anand K Mistry <amistry@google.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>
Subject: [PATCH 1/1] debugfs: Add a helper to export atomic64_t values
Date: Fri, 30 Oct 2020 18:04:42 +1100 [thread overview]
Message-ID: <20201030180403.1.I9c36fd7a0e4d52e300c1004a0f6f2fc705e2b065@changeid> (raw)
In-Reply-To: <20201030070442.457739-1-amistry@google.com>
This mirrors support for exporting atomic_t values.
Signed-off-by: Anand K Mistry <amistry@google.com>
---
fs/debugfs/file.c | 37 +++++++++++++++++++++++++++++++++++++
include/linux/debugfs.h | 6 ++++++
2 files changed, 43 insertions(+)
diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index a768a09430c3..798bd3bdedec 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -770,6 +770,43 @@ void debugfs_create_atomic_t(const char *name, umode_t mode,
}
EXPORT_SYMBOL_GPL(debugfs_create_atomic_t);
+static int debugfs_atomic64_t_set(void *data, u64 val)
+{
+ atomic64_set((atomic64_t *)data, val);
+ return 0;
+}
+static int debugfs_atomic64_t_get(void *data, u64 *val)
+{
+ *val = atomic64_read((atomic64_t *)data);
+ return 0;
+}
+DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic64_t, debugfs_atomic64_t_get,
+ debugfs_atomic64_t_set, "%lld\n");
+DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic64_t_ro, debugfs_atomic64_t_get, NULL,
+ "%lld\n");
+DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic64_t_wo, NULL, debugfs_atomic64_t_set,
+ "%lld\n");
+
+/**
+ * debugfs_create_atomic64_t - create a debugfs file that is used to read and
+ * write an atomic64_t value
+ * @name: a pointer to a string containing the name of the file to create.
+ * @mode: the permission that the file should have
+ * @parent: a pointer to the parent dentry for this file. This should be a
+ * directory dentry if set. If this parameter is %NULL, then the
+ * file will be created in the root of the debugfs filesystem.
+ * @value: a pointer to the variable that the file should read to and write
+ * from.
+ */
+void debugfs_create_atomic64_t(const char *name, umode_t mode,
+ struct dentry *parent, atomic64_t *value)
+{
+ debugfs_create_mode_unsafe(name, mode, parent, value,
+ &fops_atomic64_t, &fops_atomic64_t_ro,
+ &fops_atomic64_t_wo);
+}
+EXPORT_SYMBOL_GPL(debugfs_create_atomic64_t);
+
ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index 851dd1f9a8a5..0fac84c53eab 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -126,6 +126,8 @@ void debugfs_create_size_t(const char *name, umode_t mode,
struct dentry *parent, size_t *value);
void debugfs_create_atomic_t(const char *name, umode_t mode,
struct dentry *parent, atomic_t *value);
+void debugfs_create_atomic64_t(const char *name, umode_t mode,
+ struct dentry *parent, atomic64_t *value);
struct dentry *debugfs_create_bool(const char *name, umode_t mode,
struct dentry *parent, bool *value);
@@ -291,6 +293,10 @@ static inline void debugfs_create_atomic_t(const char *name, umode_t mode,
atomic_t *value)
{ }
+static inline void debugfs_create_atomic64_t(const char *name, umode_t mode,
+ struct dentry *parent, atomic64_t *value)
+{ }
+
static inline struct dentry *debugfs_create_bool(const char *name, umode_t mode,
struct dentry *parent,
bool *value)
--
2.29.1.341.ge80a0c044ae-goog
next prev parent reply other threads:[~2020-10-30 7:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-30 7:04 [PATCH 0/1] debugfs: Add a helper to export atomic64_t values Anand K Mistry
2020-10-30 7:04 ` Anand K Mistry [this message]
2020-10-30 7:21 ` [PATCH 1/1] " Greg Kroah-Hartman
2020-10-30 7:30 ` Anand K. Mistry
2020-10-30 8:04 ` Greg Kroah-Hartman
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