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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Josh Cartwright <joshc@codeaurora.org>
Cc: Grant Likely <grant.likely@linaro.org>,
	Rob Herring <rob.herring@calxeda.com>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-arm-msm@vger.kernel.org,
	Sagar Dharia <sdharia@codeaurora.org>,
	Gilad Avidov <gavidov@codeaurora.org>,
	Michael Bohan <mbohan@codeaurora.org>
Subject: Re: [PATCH RFC 1/3] spmi: Linux driver framework for SPMI
Date: Fri, 16 Aug 2013 11:46:14 -0700	[thread overview]
Message-ID: <20130816184614.GA31510@kroah.com> (raw)
In-Reply-To: <02deef1d90121011ab1df90ad704ef0ee36e2584.1376596224.git.joshc@codeaurora.org>

On Fri, Aug 09, 2013 at 01:37:09PM -0700, Josh Cartwright wrote:
> --- /dev/null
> +++ b/drivers/of/of_spmi.c
> @@ -0,0 +1,74 @@
> +/* Copyright (c) 2012,2013 The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +#define pr_fmt(fmt) "%s: " fmt, __func__

As you never make a pr_* call in this file, this line isn't needed.

> +++ b/drivers/spmi/spmi-dbgfs.c
> @@ -0,0 +1,591 @@
> +/* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +#define pr_fmt(fmt) "%s:%d: " fmt, __func__, __LINE__

__func__ and __LINE__?  Is that really needed, what will it help with?
Seems like extra noise, especially as you only have a few pr_* calls in
this file:

> +static int
> +spmi_read_data(struct spmi_device *sdev, uint8_t *buf, int offset, int cnt)
> +{
> +	int ret = 0;
> +	int len;
> +	uint16_t addr;
> +
> +	while (cnt > 0) {
> +		addr = offset & 0xFFFF;
> +		len = min(cnt, MAX_REG_PER_TRANSACTION);
> +
> +		ret = spmi_ext_register_readl(sdev, addr, buf, len);
> +		if (ret < 0) {
> +			pr_err("SPMI read failed, err = %d\n", ret);

Should be using dev_err() instead.

> +/**
> + * spmi_write_data: writes data across the SPMI bus
> + * @ctrl: The SPMI controller
> + * @buf: data to be written.
> + * @offset: SPMI address offset to start writing to.
> + * @cnt: The number of bytes to write.
> + *
> + * Returns 0 on success, otherwise returns error code from SPMI driver.
> + */
> +static int
> +spmi_write_data(struct spmi_device *sdev, uint8_t *buf, int offset, int cnt)
> +{
> +	int ret = 0;
> +	int len;
> +	uint16_t addr;
> +
> +	while (cnt > 0) {
> +		addr = offset & 0xFFFF;
> +		len = min(cnt, MAX_REG_PER_TRANSACTION);
> +
> +		ret = spmi_ext_register_writel(sdev, addr, buf, len);
> +		if (ret < 0) {
> +			pr_err("SPMI write failed, err = %d\n", ret);

Same, dev_err() please.

> +static ssize_t spmi_device_dfs_reg_write(struct file *file,
> +					 const char __user *buf,
> +					 size_t count, loff_t *ppos)
> +{
> +	int bytes_read;
> +	int data;
> +	int pos = 0;
> +	int cnt = 0;
> +	u8  *values;
> +	size_t ret = 0;
> +
> +	struct spmi_trans *trans = file->private_data;
> +	u32 offset = trans->offset;
> +
> +	/* Make a copy of the user data */
> +	char *kbuf = kmalloc(count + 1, GFP_KERNEL);
> +	if (!kbuf)
> +		return -ENOMEM;
> +
> +	ret = copy_from_user(kbuf, buf, count);
> +	if (ret == count) {
> +		pr_err("failed to copy data from user\n");

No need for a message here at all, you will get a message in the
function if something happened wrong.

Also, shouldn't it just be a simple:
	if (copy_from_user()) {
test?

> +		ret = -EFAULT;
> +		goto free_buf;
> +	}
> +
> +	count -= ret;
> +	*ppos += count;
> +	kbuf[count] = '\0';
> +
> +	/* Override the text buffer with the raw data */
> +	values = kbuf;
> +
> +	/* Parse the data in the buffer.  It should be a string of numbers */
> +	while (sscanf(kbuf + pos, "%i%n", &data, &bytes_read) == 1) {
> +		pos += bytes_read;
> +		values[cnt++] = data & 0xff;
> +	}
> +
> +	if (!cnt)
> +		goto free_buf;
> +
> +	/* Perform the SPMI write(s) */
> +	ret = spmi_write_data(trans->sdev, values, offset, cnt);
> +
> +	if (ret) {
> +		pr_err("SPMI write failed, err = %zu\n", ret);

dev_err() please.

> +static ssize_t spmi_device_dfs_reg_read(struct file *file, char __user *buf,
> +					size_t count, loff_t *ppos)
> +{
> +	struct spmi_trans *trans = file->private_data;
> +	struct spmi_log_buffer *log = trans->log;
> +	size_t ret;
> +	size_t len;
> +
> +	/* Is the the log buffer empty */
> +	if (log->rpos >= log->wpos) {
> +		if (get_log_data(trans) <= 0)
> +			return 0;
> +	}
> +
> +	len = min(count, (size_t) log->wpos - log->rpos);
> +
> +	ret = copy_to_user(buf, &log->data[log->rpos], len);
> +	if (ret == len) {
> +		pr_err("error copy SPMI register values to user\n");

Same comments as above.

> +void __exit spmi_dfs_exit(void)
> +{
> +	pr_debug("de-initializing spmi debugfs ...");

Not needed, use the in-kernel trace functionality if you really want to
know this.

> +	debugfs_remove_recursive(spmi_debug_root);
> +}
> +
> +void __init spmi_dfs_init(void)
> +{
> +	struct dentry *help;
> +
> +	pr_debug("creating SPMI debugfs file-system\n");

Same as above, not needed.

So, with those changes, pr_fmt() isn't needed at all :)

> --- /dev/null
> +++ b/drivers/spmi/spmi-dbgfs.h
> @@ -0,0 +1,37 @@
> +/* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +#ifndef _SPMI_DBGFS_H
> +#define _SPMI_DBGFS_H
> +
> +#include <linux/spmi.h>
> +#include <linux/debugfs.h>
> +
> +#ifdef CONFIG_DEBUG_FS

Why?  If debugfs isn't enabled, the functions should just compile away
with the debugfs_() calls, so no need to do this type of thing here,
right?

> +
> +extern void __init spmi_dfs_init(void);
> +extern void __exit spmi_dfs_exit(void);
> +extern void spmi_dfs_add_controller(struct spmi_controller *ctrl);
> +extern void spmi_dfs_del_controller(struct spmi_controller *ctrl);
> +extern void spmi_dfs_add_device(struct spmi_device *sdev);
> +extern void spmi_dfs_del_device(struct spmi_device *sdev);
> +
> +#else
> +
> +static inline void __init spmi_dfs_init(void) { }
> +static inline void __exit spmi_dfs_exit(void) { }
> +static inline void spmi_dfs_add_controller(struct spmi_controller *ctrl) { }
> +static inline void spmi_dfs_del_controller(struct spmi_controller *ctrl) { }
> +static inline void spmi_dfs_add_device(struct spmi_device *sdev) { }
> +static inline void spmi_dfs_del_device(struct spmi_device *sdev) { }
> +#endif
> +
> +#endif /* _SPMI_DBGFS_H */
> diff --git a/drivers/spmi/spmi.c b/drivers/spmi/spmi.c
> new file mode 100644
> index 0000000..3bbcc63
> --- /dev/null
> +++ b/drivers/spmi/spmi.c
> @@ -0,0 +1,449 @@
> +/* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +#define pr_fmt(fmt) "%s: " fmt, __func__

Again, not needed for this file, because:

> +int spmi_add_controller(struct spmi_controller *ctrl)
> +{
> +	int id;
> +
> +	pr_debug("adding controller for bus %d (0x%p)\n", ctrl->nr, ctrl);

dev_dbg() if you really need/want it.

> +
> +	if (((int)ctrl->nr) < 0) {
> +		pr_err("invalid bus identifier %d\n", ctrl->nr);

dev_err() please.

> +		return -EINVAL;
> +	}
> +
> +	idr_preload(GFP_KERNEL);
> +	mutex_lock(&board_lock);
> +	id = idr_alloc(&ctrl_idr, ctrl, ctrl->nr, ctrl->nr + 1, GFP_NOWAIT);
> +	mutex_unlock(&board_lock);
> +	idr_preload_end();
> +
> +	if (id < 0) {
> +		pr_err(
> +		   "idr_alloc(start:%d end:%d):%d at spmi_add_controller()\n",
> +		   ctrl->nr, ctrl->nr, id);

dev_err() please.

And then the pr_fmt() line can be removed.

thanks,

greg k-h

WARNING: multiple messages have this Message-ID
From: gregkh@linuxfoundation.org (Greg Kroah-Hartman)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH RFC 1/3] spmi: Linux driver framework for SPMI
Date: Fri, 16 Aug 2013 11:46:14 -0700	[thread overview]
Message-ID: <20130816184614.GA31510@kroah.com> (raw)
In-Reply-To: <02deef1d90121011ab1df90ad704ef0ee36e2584.1376596224.git.joshc@codeaurora.org>

On Fri, Aug 09, 2013 at 01:37:09PM -0700, Josh Cartwright wrote:
> --- /dev/null
> +++ b/drivers/of/of_spmi.c
> @@ -0,0 +1,74 @@
> +/* Copyright (c) 2012,2013 The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +#define pr_fmt(fmt) "%s: " fmt, __func__

As you never make a pr_* call in this file, this line isn't needed.

> +++ b/drivers/spmi/spmi-dbgfs.c
> @@ -0,0 +1,591 @@
> +/* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +#define pr_fmt(fmt) "%s:%d: " fmt, __func__, __LINE__

__func__ and __LINE__?  Is that really needed, what will it help with?
Seems like extra noise, especially as you only have a few pr_* calls in
this file:

> +static int
> +spmi_read_data(struct spmi_device *sdev, uint8_t *buf, int offset, int cnt)
> +{
> +	int ret = 0;
> +	int len;
> +	uint16_t addr;
> +
> +	while (cnt > 0) {
> +		addr = offset & 0xFFFF;
> +		len = min(cnt, MAX_REG_PER_TRANSACTION);
> +
> +		ret = spmi_ext_register_readl(sdev, addr, buf, len);
> +		if (ret < 0) {
> +			pr_err("SPMI read failed, err = %d\n", ret);

Should be using dev_err() instead.

> +/**
> + * spmi_write_data: writes data across the SPMI bus
> + * @ctrl: The SPMI controller
> + * @buf: data to be written.
> + * @offset: SPMI address offset to start writing to.
> + * @cnt: The number of bytes to write.
> + *
> + * Returns 0 on success, otherwise returns error code from SPMI driver.
> + */
> +static int
> +spmi_write_data(struct spmi_device *sdev, uint8_t *buf, int offset, int cnt)
> +{
> +	int ret = 0;
> +	int len;
> +	uint16_t addr;
> +
> +	while (cnt > 0) {
> +		addr = offset & 0xFFFF;
> +		len = min(cnt, MAX_REG_PER_TRANSACTION);
> +
> +		ret = spmi_ext_register_writel(sdev, addr, buf, len);
> +		if (ret < 0) {
> +			pr_err("SPMI write failed, err = %d\n", ret);

Same, dev_err() please.

> +static ssize_t spmi_device_dfs_reg_write(struct file *file,
> +					 const char __user *buf,
> +					 size_t count, loff_t *ppos)
> +{
> +	int bytes_read;
> +	int data;
> +	int pos = 0;
> +	int cnt = 0;
> +	u8  *values;
> +	size_t ret = 0;
> +
> +	struct spmi_trans *trans = file->private_data;
> +	u32 offset = trans->offset;
> +
> +	/* Make a copy of the user data */
> +	char *kbuf = kmalloc(count + 1, GFP_KERNEL);
> +	if (!kbuf)
> +		return -ENOMEM;
> +
> +	ret = copy_from_user(kbuf, buf, count);
> +	if (ret == count) {
> +		pr_err("failed to copy data from user\n");

No need for a message here at all, you will get a message in the
function if something happened wrong.

Also, shouldn't it just be a simple:
	if (copy_from_user()) {
test?

> +		ret = -EFAULT;
> +		goto free_buf;
> +	}
> +
> +	count -= ret;
> +	*ppos += count;
> +	kbuf[count] = '\0';
> +
> +	/* Override the text buffer with the raw data */
> +	values = kbuf;
> +
> +	/* Parse the data in the buffer.  It should be a string of numbers */
> +	while (sscanf(kbuf + pos, "%i%n", &data, &bytes_read) == 1) {
> +		pos += bytes_read;
> +		values[cnt++] = data & 0xff;
> +	}
> +
> +	if (!cnt)
> +		goto free_buf;
> +
> +	/* Perform the SPMI write(s) */
> +	ret = spmi_write_data(trans->sdev, values, offset, cnt);
> +
> +	if (ret) {
> +		pr_err("SPMI write failed, err = %zu\n", ret);

dev_err() please.

> +static ssize_t spmi_device_dfs_reg_read(struct file *file, char __user *buf,
> +					size_t count, loff_t *ppos)
> +{
> +	struct spmi_trans *trans = file->private_data;
> +	struct spmi_log_buffer *log = trans->log;
> +	size_t ret;
> +	size_t len;
> +
> +	/* Is the the log buffer empty */
> +	if (log->rpos >= log->wpos) {
> +		if (get_log_data(trans) <= 0)
> +			return 0;
> +	}
> +
> +	len = min(count, (size_t) log->wpos - log->rpos);
> +
> +	ret = copy_to_user(buf, &log->data[log->rpos], len);
> +	if (ret == len) {
> +		pr_err("error copy SPMI register values to user\n");

Same comments as above.

> +void __exit spmi_dfs_exit(void)
> +{
> +	pr_debug("de-initializing spmi debugfs ...");

Not needed, use the in-kernel trace functionality if you really want to
know this.

> +	debugfs_remove_recursive(spmi_debug_root);
> +}
> +
> +void __init spmi_dfs_init(void)
> +{
> +	struct dentry *help;
> +
> +	pr_debug("creating SPMI debugfs file-system\n");

Same as above, not needed.

So, with those changes, pr_fmt() isn't needed at all :)

> --- /dev/null
> +++ b/drivers/spmi/spmi-dbgfs.h
> @@ -0,0 +1,37 @@
> +/* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +#ifndef _SPMI_DBGFS_H
> +#define _SPMI_DBGFS_H
> +
> +#include <linux/spmi.h>
> +#include <linux/debugfs.h>
> +
> +#ifdef CONFIG_DEBUG_FS

Why?  If debugfs isn't enabled, the functions should just compile away
with the debugfs_() calls, so no need to do this type of thing here,
right?

> +
> +extern void __init spmi_dfs_init(void);
> +extern void __exit spmi_dfs_exit(void);
> +extern void spmi_dfs_add_controller(struct spmi_controller *ctrl);
> +extern void spmi_dfs_del_controller(struct spmi_controller *ctrl);
> +extern void spmi_dfs_add_device(struct spmi_device *sdev);
> +extern void spmi_dfs_del_device(struct spmi_device *sdev);
> +
> +#else
> +
> +static inline void __init spmi_dfs_init(void) { }
> +static inline void __exit spmi_dfs_exit(void) { }
> +static inline void spmi_dfs_add_controller(struct spmi_controller *ctrl) { }
> +static inline void spmi_dfs_del_controller(struct spmi_controller *ctrl) { }
> +static inline void spmi_dfs_add_device(struct spmi_device *sdev) { }
> +static inline void spmi_dfs_del_device(struct spmi_device *sdev) { }
> +#endif
> +
> +#endif /* _SPMI_DBGFS_H */
> diff --git a/drivers/spmi/spmi.c b/drivers/spmi/spmi.c
> new file mode 100644
> index 0000000..3bbcc63
> --- /dev/null
> +++ b/drivers/spmi/spmi.c
> @@ -0,0 +1,449 @@
> +/* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +#define pr_fmt(fmt) "%s: " fmt, __func__

Again, not needed for this file, because:

> +int spmi_add_controller(struct spmi_controller *ctrl)
> +{
> +	int id;
> +
> +	pr_debug("adding controller for bus %d (0x%p)\n", ctrl->nr, ctrl);

dev_dbg() if you really need/want it.

> +
> +	if (((int)ctrl->nr) < 0) {
> +		pr_err("invalid bus identifier %d\n", ctrl->nr);

dev_err() please.

> +		return -EINVAL;
> +	}
> +
> +	idr_preload(GFP_KERNEL);
> +	mutex_lock(&board_lock);
> +	id = idr_alloc(&ctrl_idr, ctrl, ctrl->nr, ctrl->nr + 1, GFP_NOWAIT);
> +	mutex_unlock(&board_lock);
> +	idr_preload_end();
> +
> +	if (id < 0) {
> +		pr_err(
> +		   "idr_alloc(start:%d end:%d):%d at spmi_add_controller()\n",
> +		   ctrl->nr, ctrl->nr, id);

dev_err() please.

And then the pr_fmt() line can be removed.

thanks,

greg k-h

  reply	other threads:[~2013-08-16 18:46 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-08-15 19:50 [PATCH RFC 0/3] Add support for the System Power Management Interface (SPMI) Josh Cartwright
2013-08-15 19:50 ` Josh Cartwright
2013-08-09 20:37 ` [PATCH RFC 2/3] spmi: Add MSM PMIC Arbiter SPMI controller Josh Cartwright
2013-08-09 20:37   ` Josh Cartwright
2013-08-16 18:52   ` Greg Kroah-Hartman
2013-08-16 18:52     ` Greg Kroah-Hartman
2013-08-09 20:37 ` [PATCH RFC 1/3] spmi: Linux driver framework for SPMI Josh Cartwright
2013-08-09 20:37   ` Josh Cartwright
2013-08-16 18:46   ` Greg Kroah-Hartman [this message]
2013-08-16 18:46     ` Greg Kroah-Hartman
2013-08-16 19:47     ` Josh Cartwright
2013-08-16 19:47       ` Josh Cartwright
2013-08-16 19:47       ` Josh Cartwright
2013-08-16 19:50       ` Josh Cartwright
2013-08-16 19:50         ` Josh Cartwright
2013-08-16 19:50         ` Josh Cartwright
2013-08-16 19:58       ` Greg Kroah-Hartman
2013-08-16 19:58         ` Greg Kroah-Hartman
2013-08-16 19:58         ` Greg Kroah-Hartman
2013-08-16 20:40         ` Josh Cartwright
2013-08-16 20:40           ` Josh Cartwright
2013-08-16 20:40           ` Josh Cartwright
2013-08-16 20:50           ` Greg Kroah-Hartman
2013-08-16 20:50             ` Greg Kroah-Hartman
2013-08-16 20:50             ` Greg Kroah-Hartman
2013-08-16 18:49   ` Greg Kroah-Hartman
2013-08-16 18:49     ` Greg Kroah-Hartman
2013-08-16 20:21     ` Josh Cartwright
2013-08-16 20:21       ` Josh Cartwright
2013-08-16 20:21       ` Josh Cartwright
2013-08-16 20:28       ` Greg Kroah-Hartman
2013-08-16 20:28         ` Greg Kroah-Hartman
2013-08-16 20:28         ` Greg Kroah-Hartman
2013-08-16 19:04   ` Kumar Gala
2013-08-16 19:04     ` Kumar Gala
2013-08-16 19:04     ` Kumar Gala
     [not found] ` <b639088d50df93caaef8fe7e09c12953b1153ce8.1376596224.git.joshc@codeaurora.org>
     [not found]   ` <D1534646-7CB5-4EE7-8C1E-1C607BE22396@codeaurora.org>
2013-08-16 19:25     ` [PATCH RFC 3/3] spmi: document the PMIC arbiter SPMI bindings Josh Cartwright
2013-08-16 19:25       ` Josh Cartwright
2013-08-16 19:25       ` Josh Cartwright
2013-08-16 19:48       ` Kumar Gala
2013-08-16 19:48         ` Kumar Gala
2013-08-16 19:48         ` Kumar Gala
2013-08-16 23:17         ` Stephen Warren
2013-08-16 23:17           ` Stephen Warren
2013-08-16 23:17           ` Stephen Warren

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