ARM64 / ACPI: Don't unflatten device tree if acpi=force is passed
Since the policy is that once we pass acpi=force in the early
param, we will not unflatten device tree even if ACPI is disabled
in ACPI table init fails, so fix the code by comparinging both
acpi_disabled and param_acpi_force before the device tree is
unflattened.
CC: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
index 59c05d8..e1a8965 100644
--- a/arch/arm64/include/asm/acpi.h
+++ b/arch/arm64/include/asm/acpi.h
@@ -38,6 +38,7 @@
extern int acpi_disabled;
extern int acpi_noirq;
extern int acpi_pci_disabled;
+extern bool param_acpi_force;
/* 1 to indicate PSCI 0.2+ is implemented */
static inline bool acpi_psci_present(void)
@@ -91,6 +92,8 @@
static inline bool acpi_psci_present(void) { return false; }
static inline bool acpi_psci_use_hvc(void) { return false; }
static inline void acpi_init_cpus(void) { }
+
+#define param_acpi_force false
#endif /* CONFIG_ACPI */
#endif /*_ASM_ACPI_H*/
diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index 5819ef7..fe9d8f0 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -43,7 +43,7 @@
static bool bootcpu_valid __initdata;
static bool param_acpi_off __initdata;
-static bool param_acpi_force __initdata;
+bool param_acpi_force __initdata;
static int __init parse_acpi(char *arg)
{
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index b278311..d60b1ad 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -390,7 +390,7 @@
early_ioremap_reset();
- if (acpi_disabled) {
+ if (acpi_disabled && !param_acpi_force) {
unflatten_device_tree();
psci_dt_init();
cpu_read_bootcpu_ops();