Re: [PATCH] [Coding Style]: fs/ext{3,4}/ext{3,4}_jbd{,2}.c

Roel Kluin
2008-01-11T11:04:37Z

Paul Mundt wrote:
> On Fri, Jan 11, 2008 at 10:45:30AM +0100, Roel Kluin wrote:
>> Paul Mundt wrote:
>>> On Fri, Jan 11, 2008 at 04:09:45AM +0100, Peter Stuge wrote:
>>>> On Thu, Jan 10, 2008 at 10:03:58PM +0100, Roel Kluin wrote:
>>>>> -#define DEBUG(x,args...) printk(__FUNCTION__ ": " x,##args)
>>>>> +#define DEBUG(x, args...) printk("%s: ", __func__, x, ##args)
>>>> Can this really be expected to work when x contains conversions?
>>>>
>>>> How about:
>>>>
>>>> #define DEBUG(x, args...) printk("%s: " x, __func__, ##args)
>>>>
>>> How about throwing out hand-rolled debug printk wrappers for the
>>> brain-damage they are and using the ones the kernel provides instead?
>>>
>> Should it be done like this?
>> --
>> Replace printk wrapper - with a syntax error - by pr_debug
>>
>> Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
>
> Close. But in this case #define DEBUG is already instrumented by the
> subsystem-wide debug option if it's enabled, so it's preferable to use
> that and just drop the special debug Kconfig option completely.
>
> Take a look at how CONFIG_PCMCIA_DEBUG is handled.

In drivers/pcmcia/Makefile, when CONFIG_PCMCIA_DEBUG=y, it gives
EXTRA_CFLAGS += -DDEBUG
which causes the definition of DEBUG as a macro, with definition 1.

> With DEBUG()->pr_debug() conversion here you've silently dropped the
> __func__ prefixing. Note that dev_dbg() is usually preferred when you can
> get a hold of a struct device pointer, as it takes care of prettifying
> the output with the driver name and so on, rather than the convention of
> adding a prefix. If you can't get at the struct device pointer, you'll
> probably just want to insert the __func__ prefixing manually at the
> callsites.

Ah, ok, then this should be right:
--
Replace printk wrapper - with a syntax error - by pr_debug.
DEBUG is defined 1 when CONFIG_PCMCIA_DEBUG is set.

Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
---
diff --git a/drivers/pcmcia/au1000_xxs1500.c b/drivers/pcmcia/au1000_xxs1500.c
index ce9d5c4..8e6426b 100644
--- a/drivers/pcmcia/au1000_xxs1500.c
+++ b/drivers/pcmcia/au1000_xxs1500.c
@@ -55,12 +55,6 @@
#define PCMCIA_NUM_SOCKS (PCMCIA_MAX_SOCK + 1)
#define PCMCIA_IRQ AU1000_GPIO_4

-#if 0
-#define DEBUG(x,args...) printk(__FUNCTION__ ": " x,##args)
-#else
-#define DEBUG(x,args...)
-#endif
-
static int xxs1500_pcmcia_init(struct pcmcia_init *init)
{
return PCMCIA_NUM_SOCKS;
@@ -143,13 +137,13 @@ xxs1500_pcmcia_configure_socket(const struct pcmcia_configure *configure)

if(configure->sock > PCMCIA_MAX_SOCK) return -1;

- DEBUG("Vcc %dV Vpp %dV, reset %d\n",
+ pr_debug("Vcc %dV Vpp %dV, reset %d\n",
configure->vcc, configure->vpp, configure->reset);

switch(configure->vcc){
case 33: /* Vcc 3.3V */
/* turn on power */
- DEBUG("turn on power\n");
+ pr_debug("turn on power\n");
au_writel((au_readl(GPIO2_PINSTATE) & ~(1<<14))|(1<<30),
GPIO2_OUTPUT);
au_sync_delay(100);
@@ -166,7 +160,7 @@ xxs1500_pcmcia_configure_socket(const struct pcmcia_configure *configure)
}

if (!configure->reset) {
- DEBUG("deassert reset\n");
+ pr_debug("deassert reset\n");
au_writel((au_readl(GPIO2_PINSTATE) & ~(1<<4))|(1<<20),
GPIO2_OUTPUT);
au_sync_delay(100);
@@ -174,7 +168,7 @@ xxs1500_pcmcia_configure_socket(const struct pcmcia_configure *configure)
GPIO2_OUTPUT);
}
else {
- DEBUG("assert reset\n");
+ pr_debug("assert reset\n");
au_writel(au_readl(GPIO2_PINSTATE) | (1<<4)|(1<<20),
GPIO2_OUTPUT);
}