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Date: Thu, 2 Nov 2017 10:19:33 +0000 From: Will Deacon <will.deacon@....com> To: James Morse <james.morse@....com> Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, x86@...nel.org, Catalin Marinas <catalin.marinas@....com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H . Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>, "Rafael J . Wysocki" <rjw@...ysocki.net>, Len Brown <lenb@...nel.org>, Tony Luck <tony.luck@...el.com>, Tyler Baicar <tbaicar@...eaurora.org>, Dongjiu Geng <gengdongjiu@...wei.com>, Xie XiuQi <xiexiuqi@...wei.com>, torvalds@...ux-foundation.org Subject: Re: [RFC/RFT PATCH 0/6] Switch GHES ioremap_page_range() to use fixmap On Tue, Oct 31, 2017 at 03:38:26PM +0000, James Morse wrote: > GHES is doing ioremap_page_range() in both NMI and irq context, neither > are safe as it may sleep to allocate intermediate levels of page table. > > Replace the NMI/irq GHES_IOREMAP_PAGES to use a fixmap entry each. > > After this nothing uses ghes_ioremap_area or arch_apei_flush_tlb_one(), > rip them out. > > RFC as I've only build-tested this on x86. For arm64 I've tested it on a > software model. Any more testing would be welcome. These patches are based > on rc7. > > Thanks, > > James Morse (6): > arm64: fixmap: Add GHES fixmap entries > x86/mm/fixmap: Add GHES fixmap entries > ACPI / APEI: Replace ioremap_page_range() with fixmap > ACPI / APEI: Remove ghes_ioremap_area > arm64: mm: Remove arch_apei_flush_tlb_one() > ACPI / APEI: Remove arch_apei_flush_tlb_one() > > arch/arm64/include/asm/acpi.h | 12 ------ > arch/arm64/include/asm/fixmap.h | 5 +++ > arch/arm64/mm/mmu.c | 4 ++ If you need it: Acked-by: Will Deacon <will.deacon@....com> for the arm64 bits. Will
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