Messages in this thread | | | Date | Fri, 04 Jan 2008 07:46:44 +0100 | From | Richard Knutsson <> | Subject | Re: [PATCH 1/3] ipc: Convert handmade 'max' to max(). |
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Sorry for the late response, have been away during the holidays.
Andrew Morton wrote: > On Mon, 17 Dec 2007 03:35:55 +0100 (MET) Richard Knutsson <ricknu-0@student.ltu.se> wrote: > > >> Convert handmade 'max' to max(). >> >> ... >> >> --- a/ipc/msg.c >> +++ b/ipc/msg.c >> @@ -473,7 +473,7 @@ asmlinkage long sys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf) >> up_read(&msg_ids(ns).rw_mutex); >> if (copy_to_user(buf, &msginfo, sizeof(struct msginfo))) >> return -EFAULT; >> - return (max_id < 0) ? 0 : max_id; >> + return max(max_id, 0); >> > > I don't think I like that much. > > I tend to think of max() as being an arithmetic sort of thing: pick the > largest of two scalars. > > But the code which you're changing is a _logical_ operation. It says "if > ipc_get_maxid() returned an error, then return zero. Otherwise return > whatever ipc_get_maxid() returned". > > Yes, max() will do the right thing here, but I think it's a bit of weird > trick? > > > I mean, if ipc_get_maxid() were a better function, it would return a -ve > errno when something failed rather than the present dopey hard-coded -1. > In which case the code would read > > return IS_ERR_VALUE(max_id) ? 0 : max_id; > > in which case, converting it to max() would be even less appropriate. If > you see what I mean... > Yes, have to agree. Were too quick with the changing...
Thanks Richard Knutsson
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