add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/debugfs/file.c
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@@ -378,8 +378,8 @@
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 }
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 EXPORT_SYMBOL_GPL(debugfs_attr_read);
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-ssize_t debugfs_attr_write(struct file *file, const char __user *buf,
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-			 size_t len, loff_t *ppos)
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+static ssize_t debugfs_attr_write_xsigned(struct file *file, const char __user *buf,
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+			 size_t len, loff_t *ppos, bool is_signed)
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 {
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 	struct dentry *dentry = F_DENTRY(file);
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 	ssize_t ret;
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@@ -387,11 +387,27 @@
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 	ret = debugfs_file_get(dentry);
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 	if (unlikely(ret))
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 		return ret;
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-	ret = simple_attr_write(file, buf, len, ppos);
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+	if (is_signed)
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+		ret = simple_attr_write_signed(file, buf, len, ppos);
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+	else
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+		ret = simple_attr_write(file, buf, len, ppos);
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 	debugfs_file_put(dentry);
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 	return ret;
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 }
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+
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+ssize_t debugfs_attr_write(struct file *file, const char __user *buf,
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+			 size_t len, loff_t *ppos)
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+{
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+	return debugfs_attr_write_xsigned(file, buf, len, ppos, false);
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+}
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 EXPORT_SYMBOL_GPL(debugfs_attr_write);
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+
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+ssize_t debugfs_attr_write_signed(struct file *file, const char __user *buf,
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+			 size_t len, loff_t *ppos)
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+{
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+	return debugfs_attr_write_xsigned(file, buf, len, ppos, true);
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+}
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+EXPORT_SYMBOL_GPL(debugfs_attr_write_signed);
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 static struct dentry *debugfs_create_mode_unsafe(const char *name, umode_t mode,
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 					struct dentry *parent, void *value,
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@@ -748,11 +764,11 @@
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 	*val = atomic_read((atomic_t *)data);
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 	return 0;
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 }
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-DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t, debugfs_atomic_t_get,
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+DEFINE_DEBUGFS_ATTRIBUTE_SIGNED(fops_atomic_t, debugfs_atomic_t_get,
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 			debugfs_atomic_t_set, "%lld\n");
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-DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t_ro, debugfs_atomic_t_get, NULL,
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+DEFINE_DEBUGFS_ATTRIBUTE_SIGNED(fops_atomic_t_ro, debugfs_atomic_t_get, NULL,
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 			"%lld\n");
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-DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t_wo, NULL, debugfs_atomic_t_set,
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+DEFINE_DEBUGFS_ATTRIBUTE_SIGNED(fops_atomic_t_wo, NULL, debugfs_atomic_t_set,
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 			"%lld\n");
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 /**