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Date: Fri, 15 Aug 2008 14:04:35 +0200 From: Ingo Molnar <mingo@...e.hu> To: Mark Langsdorf <mark.langsdorf@....com> Cc: Arjan van de Ven <arjan@...radead.org>, Linus Torvalds <torvalds@...ux-foundation.org>, linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de> Subject: Re: [PATCH](retry 4) invalidate caches before going into suspend * Mark Langsdorf <mark.langsdorf@....com> wrote: > When a CPU core is shut down, all of its caches need to be flushed to > prevent stale data from causing errors if the core is resumed. Current > Linux suspend code performs an assignment after the flush, which can > add dirty data back to the cache. On some AMD platforms, additional > speculative reads have caused crashes on resume because of this dirty > data. > > Relocate the cache flush to be the very last thing done before > halting. Tie into an assembly line so the compile will not reorder > it. Add some documentation explaining what is going on and why we're > doing this. > > Signed-off-by: Mark Langsdorf <mark.langsdorf@....com> > Acked-by: Mark Borden <mark.borden@....com> > Acked-by: Michael Hohmuth <michael.hohmuth@....com> applied to tip/x86/urgent - thanks Mark. Ingo -- 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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