Re: [2.6 patch][3/3] mm/ BUG -> BUG_ON conversions

[Adrian Bunk]

On Sun, Aug 29, 2004 at 03:01:56PM +0200, Jens Axboe wrote:
> On Sun, Aug 29 2004, Oliver Neukum wrote:
> > Am Sonntag, 29. August 2004 14:03 schrieb Jens Axboe:
> > > > The intention is, to add an option that lets BUG/BUG_ON/WARN_ON/PAGE_BUG 
> > > > do nothing. This option should be hidden under EMBEDDED.
> > > > 
> > > > In some environments, this seems to be desirable.
> > > 
> > > That only makes sense if you are using BUG incorrectly. A BUG()
> > > condition is something that is non-recoverable, undefining that doesn't
> > > make any sense regardless of the environment.
> > 
> > Why not? Giving reports about unrecoverable errors is sensible
> > only if the report can be read. On system this is not the case, you
> > can just salvage the memory and let it crash.
> 
> "Unrecoverable" can quite easily mean "something really bad has
> happened, corruption imminent". So maybe you would want BUG/BUG_ON to
> restart the box there, the restart-on-panic should help you there.
>...

The current sh/sh64 implementation doesn't seem to do any of the things 
you expect from BUG:

#define BUG() do { \
        printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
        asm volatile("nop"); \
} while (0)

> Jens Axboe

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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