On Tuesday 2017-03-28 18:23, SIMRAN SINGHAL wrote: >On Tue, Mar 28, 2017 at 7:24 PM, Jan Engelhardt <jeng...@inai.de> wrote: >> On Tuesday 2017-03-28 15:13, simran singhal wrote: >> >>>Some functions like kmalloc/kzalloc return NULL on failure. When NULL >>>represents failure, !x is commonly used. >>> >>>@@ -910,7 +910,7 @@ ip_vs_new_dest(struct ip_vs_service *svc, struct >>>ip_vs_dest_user_kern *udest, >>> } >>> >>> dest = kzalloc(sizeof(struct ip_vs_dest), GFP_KERNEL); >>>- if (dest == NULL) >>>+ if (!dest) >>> return -ENOMEM; >> >> This kind of transformation however is not cleanup anymore, it's really >> bikeshedding and should be avoided. There are pro and cons for both >> variants, and there is not really an overwhelming number of arguments >> for either variant to justify the change. > >Sorry, but I didn't get what you are trying to convey. And particularly pros >and >cons of both variants.
The ==NULL/!=NULL part sort of ensures that the left side is a pointer, which is lost when just using the variable and have it implicitly convert to bool.
