On Tue, Jul 24, 2018 at 11:37:10AM +0200, Rafael J. Wysocki wrote:

On Tue, Jul 24, 2018 at 11:33 AM, Arnd Bergmann [off-list ref] wrote:

quoted

Kconfig reports a warning on x86 builds after the ARM64 dependency
was added.

drivers/acpi/Kconfig:6:error: recursive dependency detected!
drivers/acpi/Kconfig:6:       symbol ACPI depends on EFI

This rephrases the dependency to keep the ARM64 details out of the
shared Kconfig file, so Kconfig no longer gets confused by it.

Fixes: 5bcd44083a08 ("drivers: acpi: add dependency of EFI for arm64")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm64/Kconfig   | 1 +
 drivers/acpi/Kconfig | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index cdcaa6a798b2..2f987a938405 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig

@@ -1267,6 +1267,7 @@ config EFI
        bool "UEFI runtime support"
        depends on OF && !CPU_BIG_ENDIAN
        depends on KERNEL_MODE_NEON
+       select ARCH_SUPPORTS_ACPI
        select LIBFDT
        select UCS2_STRING
        select EFI_PARAMS_FROM_FDT

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index a8da730fabc6..0cda51c5d433 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig

@@ -6,7 +6,7 @@
 menuconfig ACPI
        bool "ACPI (Advanced Configuration and Power Interface) Support"
        depends on !IA64_HP_SIM
-       depends on IA64 || X86 || (ARM64 && EFI)
+       depends on IA64 || X86 || ARCH_SUPPORTS_ACPI

That doesn't look particularly consistent to me.

It should be either "depends on ARCH_SUPPORTS_ACPI" alone or mention
ARM64 somehow IMO

How about something along the lines of what Ard suggested? Untested diff
below.

Will

--->8

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 303809c6..ec78d4d 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig

@@ -56,6 +56,7 @@ config ARM64
        select ARCH_USE_CMPXCHG_LOCKREF
        select ARCH_USE_QUEUED_RWLOCKS
        select ARCH_USE_QUEUED_SPINLOCKS
+       select ARCH_SUPPORTS_ACPI
        select ARCH_SUPPORTS_MEMORY_FAILURE
        select ARCH_SUPPORTS_ATOMIC_RMW
        select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 50000 || CC_IS_CLANG

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 15ab1da..198db2d 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig

@@ -3,10 +3,12 @@
 # ACPI Configuration
 #
 
+config ARCH_SUPPORTS_ACPI
+       def_bool (IA64 && !IA64_HP_SIM) || X86
+
 menuconfig ACPI
        bool "ACPI (Advanced Configuration and Power Interface) Support"
-       depends on !IA64_HP_SIM
-       depends on IA64 || X86 || (ARM64 && EFI)
+       depends on ARCH_SUPPORTS_ACPI
        depends on PCI
        select PNP
        default y if (IA64 || X86)