diff options
| author | Mark Rutland <mark.rutland@arm.com> | 2016-11-03 20:23:10 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-11-11 18:25:44 +0000 |
| commit | 580efaa7ccfb8c0790dce4396434f0e5ac8d86ee (patch) | |
| tree | 38dd7b2a74ffecb364a274494be39353a1ee9be3 /arch | |
| parent | 623b476fc815464a0241ea7483da7b3580b7d8ac (diff) | |
arm64: smp: prepare for smp_processor_id() rework
Subsequent patches will make smp_processor_id() use a percpu variable.
This will make smp_processor_id() dependent on the percpu offset, and
thus we cannot use smp_processor_id() to figure out what to initialise
the offset to.
Prepare for this by initialising the percpu offset based on
current::cpu, which will work regardless of how smp_processor_id() is
implemented. Also, make this relationship obvious by placing this code
together at the start of secondary_start_kernel().
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kernel/smp.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 8507703dabe4..f64401faa091 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -208,7 +208,10 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle) asmlinkage void secondary_start_kernel(void) { struct mm_struct *mm = &init_mm; - unsigned int cpu = smp_processor_id(); + unsigned int cpu; + + cpu = task_cpu(current); + set_my_cpu_offset(per_cpu_offset(cpu)); /* * All kernel threads share the same mm context; grab a @@ -217,8 +220,6 @@ asmlinkage void secondary_start_kernel(void) atomic_inc(&mm->mm_count); current->active_mm = mm; - set_my_cpu_offset(per_cpu_offset(smp_processor_id())); - /* * TTBR0 is only used for the identity mapping at this stage. Make it * point to zero page to avoid speculatively fetching new entries. |