linux-kernel - Re: [PATCH 11/68] 0 -> NULL, for arch/parisc

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Date:	Sun, 29 Jul 2007 23:39:09 -0600
From:	Grant Grundler <grundler@...isc-linux.org>
To:	Yoann Padioleau <padator@...adoo.fr>
Cc:	kernel-janitors@...r.kernel.org, matthew@....cx,
	grundler@...isc-linux.org, kyle@...isc-linux.org,
	parisc-linux@...isc-linux.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/68] 0 -> NULL, for arch/parisc

On Fri, Jul 27, 2007 at 11:45:05AM +0200, Yoann Padioleau wrote:
> 
> When comparing a pointer, it's clearer to compare it to NULL than to 0.
...
> diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
> index 04c7e1d..16fccbe 100644
> --- a/arch/parisc/kernel/smp.c
> +++ b/arch/parisc/kernel/smp.c
> @@ -333,7 +333,7 @@ smp_call_function (void (*func) (void *i
>  
>  	if (retry) {
>  		spin_lock (&lock);
> -		while (smp_call_function_data != 0)
> +		while (smp_call_function_data != NULL)
>  			barrier();
>  	}
>  	else {

Yoann,
Thanks!
I like comparing pointers to NULL since it makes it explicit we
are dealing with a pointer and is consistent with the assignment to NULL
later in the code.

But I'd like the later comparisons of smp_call_function_data to be
consistent with your suggestion above.
Patch below adds another "!= NULL".

thanks
grant

Signed-off-by: Grant Grundler <grundler@...isc-linux.org>


diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index 04c7e1d..c9ce659 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -333,12 +333,12 @@ smp_call_function (void (*func) (void *info), void *info, int retry, int wait)
 
 	if (retry) {
 		spin_lock (&lock);
-		while (smp_call_function_data != 0)
+		while (smp_call_function_data != NULL)
 			barrier();
 	}
 	else {
 		spin_lock (&lock);
-		if (smp_call_function_data) {
+		if (smp_call_function_data != NULL) {
 			spin_unlock (&lock);
 			return -EBUSY;
 		}
-
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