From: Linus Torvalds <[EMAIL PROTECTED]> Date: Thu, 26 Jul 2007 16:04:42 -0700 (PDT)
> Quite frankly, my preference would be (a) followed by (e) or (f), and > (b)-(d) are in my opinion the worst of the lot with no upsides at all (and > (b) in particular is pretty much _guaranteed_ to break existing setups). I look at some cases, such as EHEA on powerpc which is a pretty modern driver written by not clueless folks, and wonder if they do it because they know the IRQ is non-shared, they know their interrupt handler is insanely simple and short, and just want to avoid the overhead of that sti()/cli() in the caller. All the EHEA interrupt handler does is unconditionally set a state bit and schedule a softirq, then return. The powerpc folks do delayed IRQ enable/disable using software state, but perhaps these drivers were written before that. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
