[cocci] spatch really could use a --keep-going

[Lyude Paul <lyude@redhat.com>]

An issue that I've hit with coccinelle a number of times now is that despite
being a semantic patching tool, it actually can be really painful at times
trying to get it to do transformations across the entire kernel source.

One example:

@depends on patch@
@@
(
- local_irq_disable();
+ local_interrupt_disable();
|
- local_irq_enable();
+ local_interrupt_enable();
)

I've been trying to run this rule to run experiments with a potential new API
we've been working on in the Linux kernel to make interrupt enable/disable
refcounted. The problem is this rule fails in exactly one spot:

EXN: Failure("./lib/locking-selftest.c: 199: try to delete an expanded token:
local_irq_enable") in ./lib/locking-selftest.c

Which happens because it gets tripped up on this line:

#define HARDIRQ_DISABLE		local_irq_disable
#define HARDIRQ_ENABLE		local_irq_enable

Now - I'm sure there is a way I could actually properly fix the rule I've
written. But - I don't think I actually should need to do that. The reality is
I've hit quite a number of situations like this where I simply can't use the -
-dir option in spatch across the kernel because a single file in the kernel
tree breaks spatch. And a lot of times I hit this I'm trying do one-off
conversions where I really do not do much but waste time trying to workaround
issues like this since the rules I'm writing will probably never be run again.

Which brings me to ask: could we have a --keep-going option? The idea is very
simple: don't stop performing transformations if coccinelle hits an error,
simply either ignore and continue - or simply skip the one file that failed
and continue. I'd love to add something like this myself but despite doing
kernel development for over a decade I honestly cannot wrap my head around
ocaml source at all.
-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat

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