| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-id: <520C73D6.3010904@samsung.com>
Date: Thu, 15 Aug 2013 09:23:18 +0300
From: Dmitry Kasatkin <d.kasatkin@...sung.com>
To: joelf@...com
Cc: Joe Perches <joe@...ches.com>,
Herbert Xu <herbert@...dor.hengli.com.au>,
"David S. Miller" <davem@...emloft.net>,
Mark Greer <mgreer@...malcreek.com>,
Tony Lindgren <tony@...mide.com>,
Santosh Shilimkar <santosh.shilimkar@...com>,
Rajendra Nayak <rnayak@...com>,
Lokesh Vutla <lokeshvutla@...com>,
Linux OMAP List <linux-omap@...r.kernel.org>,
Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: Re: [PATCH 02/10] crypto: omap-aes: Add useful debug macros
On 15/08/13 06:12, Joel Fernandes wrote:
> On 08/14/2013 07:47 PM, Joe Perches wrote:
>> On Wed, 2013-08-14 at 18:40 -0500, Joel Fernandes wrote:
>>> On 08/14/2013 06:29 PM, Joe Perches wrote:
>>>> On Wed, 2013-08-14 at 18:12 -0500, Joel Fernandes wrote:
>>>>> When DEBUG is enabled, these macros can be used to print variables
>>>>> in integer and hex format, and clearly display which registers,
>>>>> offsets and values are being read/written , including printing the
>>>>> names of the offsets and their values.
>>>> []
>>>>> diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
>>>> []
>>>>> @@ -15,6 +15,14 @@
>>>>>
>>>>> #define pr_fmt(fmt) "%s: " fmt, __func__
>>>>>
>>>>> +#ifdef DEBUG
>>>>> +#define prn(num) printk(#num "=%d\n", num)
>>>>> +#define prx(num) printk(#num "=%x\n", num)
>>>> pr_debug?
>>> Sure, can change that.
>>>
>>>>> +#else
>>>>> +#define prn(num) do { } while (0)
>>>>> +#define prx(num) do { } while (0)
>>>>> +#endif
>>>> []
>>>>> @@ -172,13 +180,35 @@ struct omap_aes_dev {
>>>>> static LIST_HEAD(dev_list);
>>>>> static DEFINE_SPINLOCK(list_lock);
>>>>>
>>>>> +#ifdef DEBUG
>>>>> +#define omap_aes_read(dd, offset) \
>>>>> + do { \
>>>>> + omap_aes_read_1(dd, offset); \
>>>>> + pr_debug("omap_aes_read(" #offset ")\n"); \
>>>>> + } while (0)
>>>>> +
>>>>> +static inline u32 omap_aes_read_1(struct omap_aes_dev *dd, u32 offset)
>>>>> +#else
>>>>> static inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
>>>>> +#endif
>>>>> {
>>>>> return __raw_readl(dd->io_base + offset);
>>>>> }
>>>>>
>>>>> +#ifdef DEBUG
>>>>> +#define omap_aes_write(dd, offset, value) \
>>>>> + do { \
>>>>> + pr_debug("omap_aes_write(" #offset "=%x) value=%d\n", \
>>>>> + offset, value); \
>>>>> + omap_aes_write_1(dd, offset, value); \
>>>>> + } while (0)
>>>>> +
>>>>> +static inline void omap_aes_write_1(struct omap_aes_dev *dd, u32 offset,
>>>>> + u32 value)
>>>>> +#else
>>>>> static inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
>>>>> u32 value)
>>>>> +#endif
>>>>> {
>>>>> __raw_writel(value, dd->io_base + offset);
>>>>> }
>>>> Umm, yuck?
>>>>
>>>> Is there any real value in read_1 and write_1?
>>> Can you be more descriptive? There is a lot of value in them for debug
>>> to show clearly sequence of read/writes. Moreover, they are no-op'd when
>>> DEBUG is disabled.
>> pr_debug is no-op'd when DEBUG is not #defined.
>> so just use a single
>>
>> omap_aes_write(...)
>> {
>> pr_debug(...)
>> __raw_writel(...);
>> }
> Actually this doesn't work, as the pr_debug cannot print the name of the
> offset as my original patch set does using "#offset".
>
> There are many places where named offsets are used to pass to
> read/write, and this macro helps to visually see which offset is being
> written to by name.
>
> So the original patch would stand in its current form except for a small
> rewrite of the write debug part of it as follows to be cleaner getting
> rid of the _1. For the read , we still need it as we need to return the
> value from a function which cannot be done in a macro.
>
> So the new patch would look something like this:
>
> #ifdef DEBUG
> #define omap_aes_read(dd, offset) \
> omap_aes_read_1(dd, offset); \
> pr_debug("omap_aes_read(" #offset ")\n");
> static inline u32 omap_aes_read_1(struct omap_aes_dev *dd, u32 offset)
> #else
> static inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
> #endif
> {
> return __raw_readl(dd->io_base + offset);
> }
Bellow version "write" looks much more readable - never re-define
function signature by macro.
Above should be similar as well...
> #ifdef DEBUG
> #define omap_aes_write(dd, offset, value) \
> do { \
> pr_debug("omap_aes_write(" #offset "=%x) value=%d\n", \
> offset, value); \
> __raw_writel(value, dd->io_base + offset); \
> } while (0)
> #else
> static inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
> u32 value)
> {
> __raw_writel(value, dd->io_base + offset);
> }
> #endif
>
>
> Thanks,
>
> -Joel
> --
> To unsubscribe from this list: send the line "unsubscribe linux-crypto" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists