lkml.org 
[lkml]   [2004]   [Apr]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [linux-usb-devel] [PATCH 7/9] USB usbfs: destroy submitted urbs only on the disconnected interface
Date
> > Hi Oliver, I thought you meant that CONFIG_EMBEDDED made WARN_ON go away
> > (or something like that). If you just mean that it is easy to redefine
> > WARN_ON by hand, then all I can say is: it is also easy to redefine warn
> > by hand! Anyway, I made you the following patch:
>
> Yes, but I don't trust gcc to optimise away the 'if' if you redefine
> warn().

The "if" cannot be optimized away for the case in point, because it
does something (clears the bit) if it passes the test. If I used WARN_ON
then it would have to be WARN_ON(1) in the else branch of the if.

> But there is another point. The embedded people deserve a single switch
> to remove assertion checks. The purpose of macros like WARN_ON() is
> easy and _central_ choice of debugging output vs. kernel size.

This is not an argument against using USB's warn, it is an argument for
building warn on top of a centralized macro like WARN_ON or a friend.

All the best,

Duncan.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:02    [W:2.239 / U:0.472 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site