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ARM64 / ACPI: Don't unflatten device tree if acpi=force is passed

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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>
This commit is contained in:
Hanjun Guo 2015-03-24 14:02:56 +00:00 committed by Will Deacon
parent 735f00bdf2
commit 33757ded07
3 changed files with 5 additions and 2 deletions
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3
arch/arm64/include/asm/acpi.h
View File

@ -38,6 +38,7 @@ typedef u64 phys_cpuid_t;
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 @@ void __init acpi_init_cpus(void);
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*/

2
arch/arm64/kernel/acpi.c
View File

@ -43,7 +43,7 @@ static int enabled_cpus;
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)
{

2
arch/arm64/kernel/setup.c
View File

@ -390,7 +390,7 @@ void __init setup_arch(char **cmdline_p)
early_ioremap_reset();
if (acpi_disabled) {
if (acpi_disabled && !param_acpi_force) {
unflatten_device_tree();
psci_dt_init();
cpu_read_bootcpu_ops();