[lkml]   [2007]   [Mar]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: (trivia) remove useless typecast around `jif' variable
On Mar 5 2007 19:12, Michael Tokarev wrote:

>Date: Mon, 5 Mar 2007 19:12:51 +0300 (MSK)
>From: Michael Tokarev <>
>To: undisclosed-recipients: ;

I have no clue what you sent it to, so I added linux-kernel again.

>Subject: (trivia) remove useless typecast around `jif' variable
>in fs/proc/proc_misc.c:show_stat() routine (which handles /proc/stat
>file), there's a local variable named 'jif' of type unsigned long,
>declared as following:
>static int show_stat(struct seq_file *p, void *v)
> unsigned long jif;
>But later on, it's explicitly casted to (unsigned long) in printf().
>Remove the useless cast, to let the compiler to do the work for us
>in case we'll want to use different type here (say, u64 or something).

In case we wanted to use different types, we would also have to
change the accompanying %lu into %llu. Only changing jif to u64 will
cause a problem, as the compiler does _not_ automatically
promote/demote types in varargs that already have a certain size. In
other words,

int foo(unsigned long x)
printk("%llu\n", x); /* and */
printk("%lu\n", x);

will throw a warning (rightfully if you ask me).

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-03-05 17:33    [W:0.960 / U:0.072 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site