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| author | Nicholas Piggin <npiggin@gmail.com> | 2018-02-14 01:08:18 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-03-30 23:34:27 +1100 |
| commit | 9f593f131ed463dc571290980dd12cb9e56d8ea5 (patch) | |
| tree | 8bc19a7024692d8d26f0b3b7956e7c2284b48956 /arch/powerpc/kernel/prom.c | |
| parent | c0abd0c745bdabe027a8f013a866f385fba717b1 (diff) | |
| download | lwn-9f593f131ed463dc571290980dd12cb9e56d8ea5.tar.gz lwn-9f593f131ed463dc571290980dd12cb9e56d8ea5.zip | |
powerpc/setup: Add cpu_to_phys_id array
Build an array that finds hardware CPU number from logical CPU
number in firmware CPU discovery. Use that rather than setting
paca of other CPUs directly, to begin with. Subsequent patch will
not have pacas allocated at this point.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Fix SMP=n build by adding #ifdef in arch_match_cpu_phys_id()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/prom.c')
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 4dffef947b8a..0d59a7128deb 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -874,5 +874,15 @@ EXPORT_SYMBOL(cpu_to_chip_id); bool arch_match_cpu_phys_id(int cpu, u64 phys_id) { +#ifdef CONFIG_SMP + /* + * Early firmware scanning must use this rather than + * get_hard_smp_processor_id because we don't have pacas allocated + * until memory topology is discovered. + */ + if (cpu_to_phys_id != NULL) + return (int)phys_id == cpu_to_phys_id[cpu]; +#endif + return (int)phys_id == get_hard_smp_processor_id(cpu); } |