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Date: Sun, 23 Feb 2014 11:52:42 -0800 From: Sebastian Capella <sebastian.capella@...aro.org> To: Lorenzo Pieralisi <lorenzo.pieralisi@....com>, "Russell King - ARM Linux" <linux@....linux.org.uk> Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, "linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "Russ Dill" <Russ.Dill@...com>, "Rafael J. Wysocki" <rjw@...ysocki.net>, "Len Brown" <len.brown@...el.com>, "Pavel Machek" <pavel@....cz>, "Nicolas Pitre" <nico@...aro.org>, "Santosh Shilimkar" <santosh.shilimkar@...com>, "Will Deacon" <Will.Deacon@....com>, "Cyril Chemparathy" <cyril@...com>, "Jonathan Austin" <Jonathan.Austin@....com>, "Catalin Marinas" <Catalin.Marinas@....com>, "Uwe Kleine-K?nig" <u.kleine-koenig@...gutronix.de>, "Stephen Boyd" <sboyd@...eaurora.org> Subject: Re: [PATCH RFC v1 3/3] ARM hibernation / suspend-to-disk Quoting Lorenzo Pieralisi (2014-02-22 04:09:10) > On Sat, Feb 22, 2014 at 10:38:40AM +0000, Russell King - ARM Linux wrote: > > On Wed, Feb 19, 2014 at 04:12:54PM +0000, Lorenzo Pieralisi wrote: > > > > + cpu_switch_mm(idmap_pgd, &init_mm); > > > > You need the idmap_pgd in place to call cpu_resume at it's physical > > address. Other page tables just won't do here. It's well established > > that this page table must be in place for the resume paths to work. > > Well, we do not need idmap page tables for copying the restore_pblist, > but we do need a set of tables that won't be corrupted by the copy and > idmap does the trick (I was confused because 1:1 mappings are not needed > for the copy itself). > > The switch to idmap is done for us in soft_reboot anyway before jumping to > cpu_resume and that's required, as you said. Ok, so I'll leave the cpu_switch_mm as is for the next patchset. Thanks Lorenzo, Russ and Russell! Sebastian -- 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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