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Date: Sun, 22 Sep 2013 14:41:01 +1000 From: Benjamin Herrenschmidt <benh@...nel.crashing.org> To: "H. Peter Anvin" <hpa@...or.com> Cc: Frederic Weisbecker <fweisbec@...il.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>, Paul Mackerras <paulus@....ibm.com>, Ingo Molnar <mingo@...nel.org>, Peter Zijlstra <peterz@...radead.org>, James Hogan <james.hogan@...tec.com>, "James E.J. Bottomley" <jejb@...isc-linux.org>, Helge Deller <deller@....de>, Martin Schwidefsky <schwidefsky@...ibm.com>, Heiko Carstens <heiko.carstens@...ibm.com>, "David S. Miller" <davem@...emloft.net>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [RFC GIT PULL] softirq: Consolidation and stack overrun fix On Sun, 2013-09-22 at 14:39 +1000, Benjamin Herrenschmidt wrote: > How do you do your per-cpu on x86 ? On powerpc we struggle because we > try to dedicate a register (r13) to this PACA (the per-cpu offset hangs > off it), but we constantly run into issues where gcc copies r13 to > another register and then indexes off that, even accross > preempt_enable/disable sections, or worst such as saving/restoring from > the stack. We can't seem to get the compiler to treat it appropriately > as volatile. Also, do you have a half-decent way of getting to per-cpu from asm ? Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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