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Date: Sat, 27 Sep 2008 18:35:28 +0200 From: Ingo Molnar <mingo@...e.hu> To: Arjan van de Ven <arjan@...ux.intel.com> Cc: Suresh Siddha <suresh.b.siddha@...el.com>, Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>, Linas Vepstas <linas@...tin.ibm.com>, "rajesh.shah@...el.com" <rajesh.shah@...el.com>, Greg Kroah-Hartman <gregkh@...e.de>, Kristen Accardi <kristen.c.accardi@...el.com>, Muli Ben-Yehuda <muli@...ibm.com>, jbarnes@...tuousgeek.org, tglx@...utronix.de, hpa@...or.com, torvalds@...ux-foundation.org, akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, Yinghai Lu <yhlu.kernel@...il.com> Subject: Re: [PATCH] x86, pci-hotplug, calgary / rio: fix EBDA ioremap() * Arjan van de Ven <arjan@...ux.intel.com> wrote: >>> >>> mapping the EBDA is rather ... un-nice from that driver, so i guess >>> you check does the right thing in flagging possible crap. >> >> it does: >> >> addr: 0x9f800 >> end: 0xaf5e7 >> p->start: 0x9f800 >> p->end: 0x9ffff >> >> resources are laid out like this: >> >> 0009f800-0009ffff : reserved >> 000a0000-000bffff : Video RAM area >> >> so the driver over-maps into the Video RAM... > > ... and makes that uncachable (while it probably was WC before) ah, neat angle, i did not consider that. One more entry into the '10 good reasons why ioremap-ing RAM is bad' list. 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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