linux-kernel - Re: [PATCH 10/68] 0 -> NULL, for arch/mips

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Date:	Sat, 28 Jul 2007 14:43:49 +0200
From:	Markus Gothe <markus.gothe@....se>
To:	Yoann Padioleau <padator@...adoo.fr>
Cc:	kernel-janitors@...r.kernel.org, ralf@...ux-mips.org,
	linux-mips@...ux-mips.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/68] 0 -> NULL, for arch/mips

Usually it's not only cleaner, it's what you want to do... AFAIK  
'NULL' is implemented/defined by the compiler, so if you've got a  
compiler which defines NULL otherwise than( a pointer to) zero you're  
screwed. ;)

//Markus

On 27 Jul, 2007, at 11:45 , Yoann Padioleau wrote:

>
> When comparing a pointer, it's clearer to compare it to NULL than  
> to 0.
>
> Here is an excerpt of the semantic patch:
>
> @@
> expression *E;
> @@
>
>   E ==
> - 0
> + NULL
>
> @@
> expression *E;
> @@
>
>   E !=
> - 0
> + NULL
>
> Signed-off-by: Yoann Padioleau <padator@...adoo.fr>
> Cc: ralf@...ux-mips.org
> Cc: linux-mips@...ux-mips.org
> Cc: akpm@...ux-foundation.org
> ---
>
>  ops-emma2rh.c |    2 +-
>  ops-pnx8550.c |   12 ++++++------
>  2 files changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/arch/mips/pci/ops-emma2rh.c b/arch/mips/pci/ops-emma2rh.c
> index 38f1816..d31bfc6 100644
> --- a/arch/mips/pci/ops-emma2rh.c
> +++ b/arch/mips/pci/ops-emma2rh.c
> @@ -45,7 +45,7 @@ static int check_args(struct pci_bus *bu
>  	/* check if the bus is top-level */
>  	if (bus->parent != NULL) {
>  		*bus_num = bus->number;
> -		db_assert(bus_num != 0);
> +		db_assert(bus_num != NULL);
>  	} else
>  		*bus_num = 0;
>
> diff --git a/arch/mips/pci/ops-pnx8550.c b/arch/mips/pci/ops-pnx8550.c
> index f556b7a..d610646 100644
> --- a/arch/mips/pci/ops-pnx8550.c
> +++ b/arch/mips/pci/ops-pnx8550.c
> @@ -117,7 +117,7 @@ read_config_byte(struct pci_bus *bus, un
>  	unsigned int data = 0;
>  	int err;
>
> -	if (bus == 0)
> +	if (bus == NULL)
>  		return -1;
>
>  	err = config_access(PCI_CMD_CONFIG_READ, bus, devfn, where, ~(1  
> << (where & 3)), &data);
> @@ -145,7 +145,7 @@ read_config_word(struct pci_bus *bus, un
>  	unsigned int data = 0;
>  	int err;
>
> -	if (bus == 0)
> +	if (bus == NULL)
>  		return -1;
>
>  	if (where & 0x01)
> @@ -168,7 +168,7 @@ static int
>  read_config_dword(struct pci_bus *bus, unsigned int devfn, int  
> where, u32 * val)
>  {
>  	int err;
> -	if (bus == 0)
> +	if (bus == NULL)
>  		return -1;
>
>  	if (where & 0x03)
> @@ -185,7 +185,7 @@ write_config_byte(struct pci_bus *bus, u
>  	unsigned int data = (unsigned int)val;
>  	int err;
>
> -	if (bus == 0)
> +	if (bus == NULL)
>  		return -1;
>
>  	switch (where & 0x03) {
> @@ -213,7 +213,7 @@ write_config_word(struct pci_bus *bus, u
>  	unsigned int data = (unsigned int)val;
>  	int err;
>
> -	if (bus == 0)
> +	if (bus == NULL)
>  		return -1;
>
>  	if (where & 0x01)
> @@ -235,7 +235,7 @@ static int
>  write_config_dword(struct pci_bus *bus, unsigned int devfn, int  
> where, u32 val)
>  {
>  	int err;
> -	if (bus == 0)
> +	if (bus == NULL)
>  		return -1;
>
>  	if (where & 0x03)
>
>

_______________________________________

Mr Markus Gothe
Software Engineer

Phone: +46 (0)13 21 81 20 (ext. 1046)
Fax: +46 (0)13 21 21 15
Mobile: +46 (0)73 718 72 80
Diskettgatan 11, SE-583 35 Linköping, Sweden
www.27m.com



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