Re: [PATCH 2/8] signal: make kill_as_cred_perm() return bool

[Al Viro]

On Mon, May 28, 2018 at 03:49:10PM +0200, Christian Brauner wrote:
> kill_as_cred_perm() already behaves like a boolean function. Let's actually
> declare it as such too.
> 
> Signed-off-by: Christian Brauner <christ...@brauner.io>
> ---
>  kernel/signal.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/signal.c b/kernel/signal.c
> index c756008d589e..81be01d193f4 100644
> --- a/kernel/signal.c
> +++ b/kernel/signal.c
> @@ -1349,14 +1349,15 @@ static int kill_proc_info(int sig, struct siginfo 
> *info, pid_t pid)
>       return error;
>  }
>  
> -static int kill_as_cred_perm(const struct cred *cred,
> +static bool kill_as_cred_perm(const struct cred *cred,
>                            struct task_struct *target)
>  {
>       const struct cred *pcred = __task_cred(target);
>       if (!uid_eq(cred->euid, pcred->suid) && !uid_eq(cred->euid, pcred->uid) 
> &&
>           !uid_eq(cred->uid,  pcred->suid) && !uid_eq(cred->uid,  pcred->uid))
> -             return 0;
> -     return 1;
> +             return false;
> +
> +     return true;

Ugh...
        if (!foo && !bar && !baz && !quux)
                return false;
        return true;

is a bloody odd way to spell

        return foo || bar || baz || quux;