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    Subject[PATCH v2 2/3] x86/acpi: take rsdp address for boot params if available
    Date
    In case the rsdp address in struct boot_params is specified don't try
    to find the table by searching, but take the address directly as set
    by the boot loader.

    Signed-off-by: Juergen Gross <jgross@suse.com>
    ---
    drivers/acpi/osl.c | 8 ++++++++
    1 file changed, 8 insertions(+)

    diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
    index 3bb46cb24a99..3b25e2ad7d75 100644
    --- a/drivers/acpi/osl.c
    +++ b/drivers/acpi/osl.c
    @@ -45,6 +45,10 @@
    #include <linux/uaccess.h>
    #include <linux/io-64-nonatomic-lo-hi.h>

    +#ifdef CONFIG_X86
    +#include <asm/setup.h>
    +#endif
    +
    #include "internal.h"

    #define _COMPONENT ACPI_OS_SERVICES
    @@ -195,6 +199,10 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
    if (acpi_rsdp)
    return acpi_rsdp;
    #endif
    +#ifdef CONFIG_X86
    + if (boot_params.hdr.acpi_rsdp_addr)
    + return boot_params.hdr.acpi_rsdp_addr;
    +#endif

    if (efi_enabled(EFI_CONFIG_TABLES)) {
    if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
    --
    2.12.3
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