On Mon, Mar 9, 2015 at 12:46 PM, Ingo Molnar <mi...@kernel.org> wrote: > > * Andy Lutomirski <l...@amacapital.net> wrote: > >> >> */ >> >> unsigned long stack[64]; >> >> >> >> Last I checked, 0x100 != 64. Also, wow, this is kind of disgusting. :) >> > >> > >> > Seems to be unused: I commented it out on "defconfig" build >> > and got no build errors. >> >> It's used. On 32-bit, NMIs don't use task gates (I don't know why), > > So task gates were a sexy hardware acceleration feature, eons ago, and > we used to rely on them a lot,
IIRC task gates weren't used in Linux at first, and now they are only used for double fault handler - because in many cases double fault is caused by stack problems, and task gate provides a way to have alternative stack even for exceptions happening in CPL0. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
