[Ksummit-2012-discuss] Smatch for static analysis testing

Takashi Iwai tiwai at suse.de
Fri Jun 22 12:29:31 UTC 2012

At Fri, 22 Jun 2012 14:13:11 +0300,
Dan Carpenter wrote:
> Since last year, I've moved from fixing bugs to just reporting them.
> If I don't understand the code then I normally don't report it.
> For example in  sound/drivers/serial-u16550.c:
>    442                  byte = (0 & UART_IER_RDI)       /* Disable Receiver data interrupt */
>    443                      |(0 & UART_IER_THRI)        /* Disable Transmitter holding register empty interrupt */
>    444                      ;
> Surely, the author understands that he is setting "byte = 0;" right?
> Looking at it now, I suppose it's possible that bitwise negate was
> intended.  This is old so I wouldn't report it for that reason as
> well.

Oh, that old crap in that directory?  Shame on me.
It should be cleaned up indeed.  Normal kernel coders must understand
"byte = 0" means to clear all IRQ bit masks.

But this also reminds me of another question: may we discuss about the
lifetime of old hardware drivers (or subsystems)?


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