linux-kernel - Re: [RFC/RFT PATCH 3/6] ACPI / APEI: Replace ioremap_page

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Message-ID: <20171101133430.if3j2kzins44nv7o@pd.tnic>
Date:   Wed, 1 Nov 2017 14:34:30 +0100
From:   Borislav Petkov <bp@...e.de>
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>,
        Will Deacon <will.deacon@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        "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 3/6] ACPI / APEI:  Replace ioremap_page_range()
 with fixmap

On Tue, Oct 31, 2017 at 03:38:29PM +0000, James Morse wrote:
> Replace ghes_io{re,un}map_pfn_{nmi,irq}()s use of ioremap_page_range()
> with __set_fixmap() as ioremap_page_range() may sleep to allocate a new
> level of page-table, even if its passed an existing final-address to
> use in the mapping.
> 
> clear_fixmap() does the TLB invalidation in __set_fixmap() for arm64
> and __set_pte_vaddr() for x86. In each case its the same as the
> respective arch_apei_flush_tlb_one().
> 
> Reported-by: Fengguang Wu <fengguang.wu@...el.com>
> Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: James Morse <james.morse@....com>
> CC: Tyler Baicar <tbaicar@...eaurora.org>
> CC: Dongjiu Geng <gengdongjiu@...wei.com>
> CC: Xie XiuQi <xiexiuqi@...wei.com>
> 
> ---
> CC'd people I've seen posting CPER log fragments, could you give this a
> test on your platforms?
> 
>  drivers/acpi/apei/ghes.c | 45 +++++++++++++++------------------------------
>  1 file changed, 15 insertions(+), 30 deletions(-)

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
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