Re: [RFC GIT PULL] softirq: Consolidation and stack overrun fix

[Benjamin Herrenschmidt]

On Tue, 2013-09-24 at 04:44 +0200, Frederic Weisbecker wrote:
> So the safest way to fix this is to unconditionally call do_softirq()
> from irq_exit().
> A performance penalty may come along but safety primes.
> 
> We should probably do that and work on longer term solutions (Kconfig
> based arch switch, etc...)
> for the next merge window?

As you prefer, though I'm keen on getting the "fast" version in RHEL7 if
RH will take it :-)

>From the generic code POV, it's a one-liner #ifdef to select between
do_softirq and __do_softirq() right ? Then it's up to the arch to
#define I_CAN_DO_FAST !

> I'll respin the series plus the regression fix, unless somebody has a
> better solution.

Cheers,
Ben.


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