Re: [patch] mm, mempolicy: make mpol_to_str robust and alwayssucceed

[David Rientjes]

On Tue, 24 Sep 2013, Dave Jones wrote:

>  >  	case MPOL_BIND:
>  > -		/* Fall through */
>  >  	case MPOL_INTERLEAVE:
>  >  		nodes = pol->v.nodes;
>  >  		break;
> 
> Any reason not to leave this ?
> 
> "missing break" is the 2nd most common thing that coverity picks up.
> Most of them are false positives like the above, but the lack of annotations
> in our source makes it time-consuming to pick through them all to find the
> real bugs.
> 

Check out things like drivers/mfd/wm5110-tables.c that do things like

	switch (reg) {
	case ARIZONA_SOFTWARE_RESET:
	case ARIZONA_DEVICE_REVISION:
	case ARIZONA_CTRL_IF_SPI_CFG_1:
	case ARIZONA_CTRL_IF_I2C1_CFG_1:
	case ARIZONA_CTRL_IF_I2C2_CFG_1:
	case ARIZONA_CTRL_IF_I2C1_CFG_2:
	case ARIZONA_CTRL_IF_I2C2_CFG_2:
	...

and that file has over 1,000 case statements.  Having a

	/* fall through */

for all of them would be pretty annoying.

I don't remember any coding style rule about this (in fact 
Documentation/CodingStyle has examples of case statements without such a 
comment), I think it's just personal preference so I'll leave it to Andrew 
and what he prefers.

(And if he prefers the /* fall through */ then we should ask that it be 
added to checkpatch.pl since it warns about a million other things and not 
this.)
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