On Sun, Nov 22, 2020 at 11:53:55AM -0800, James Bottomley wrote:

On Sun, 2020-11-22 at 11:22 -0800, Joe Perches wrote:

quoted

On Sun, 2020-11-22 at 11:12 -0800, James Bottomley wrote:

quoted

On Sun, 2020-11-22 at 10:25 -0800, Joe Perches wrote:

quoted

On Sun, 2020-11-22 at 10:21 -0800, James Bottomley wrote:

quoted

Please tell me our reward for all this effort isn't a single
missing error print.

There were quite literally dozens of logical defects found
by the fallthrough additions.  Very few were logging only.

So can you give us the best examples (or indeed all of them if
someone is keeping score)?  hopefully this isn't a US election
situation ...

Gustavo?  Are you running for congress now?

https://lwn.net/Articles/794944/

That's 21 reported fixes of which about 50% seem to produce no change
in code behaviour at all, a quarter seem to have no user visible effect
with the remaining quarter producing unexpected errors on obscure
configuration parameters, which is why no-one really noticed them
before.

The really important point here is the number of bugs this has prevented
and will prevent in the future. See an example of this, below:

https://lore.kernel.org/linux-iio/20190813135802.GB27392@kroah.com/ (local)

This work is still relevant, even if the total number of issues/bugs
we find in the process is zero (which is not the case).

"The sucky thing about doing hard work to deploy hardening is that the
result is totally invisible by definition (things not happening) [..]"
- Dmitry Vyukov

Thanks
--
Gustavo