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    Subject[PATCH v8 03/21] arm64: allow late use of early_ioremap
    Date
    From: Mark Salter <msalter@redhat.com>

    Commit 0e63ea48b4d8 (arm64/efi: add missing call to early_ioremap_reset())
    added a missing call to early_ioremap_reset(). This triggers a BUG if code
    tries using early_ioremap() after the early_ioremap_reset(). This is a
    problem for some ACPI code which needs short-lived temporary mappings
    after paging_init() but before acpi_early_init() in start_kernel(). This
    patch adds definitions for the __late_set_fixmap() and __late_clear_fixmap()
    which avoids the BUG by allowing later use of early_ioremap().

    CC: Leif Lindholm <leif.lindholm@linaro.org>
    CC: Ard Biesheuvel <ard.biesheuvel@linaro.org>
    Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
    Tested-by: Mark Langsdorf <mlangsdo@redhat.com>
    Tested-by: Jon Masters <jcm@redhat.com>
    Signed-off-by: Mark Salter <msalter@redhat.com>
    Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
    ---
    arch/arm64/include/asm/fixmap.h | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h
    index 9ef6eca..e629c70 100644
    --- a/arch/arm64/include/asm/fixmap.h
    +++ b/arch/arm64/include/asm/fixmap.h
    @@ -61,6 +61,9 @@ void __init early_fixmap_init(void);

    #define __early_set_fixmap __set_fixmap

    +#define __late_set_fixmap __set_fixmap
    +#define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
    +
    extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);

    #include <asm-generic/fixmap.h>
    --
    1.9.1


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