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arm64: apply alternatives for !SMP kernels

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Currently we only perform alternative patching for kernels built with
CONFIG_SMP, as we call apply_alternatives_all() in smp.c, which is only
built for CONFIG_SMP. Thus !SMP kernels may not have necessary
alternatives patched in.

This patch ensures that we call apply_alternatives_all() once all CPUs
are booted, even for !SMP kernels, by having the smp_init_cpus() stub
call this for !SMP kernels via up_late_init. A new wrapper,
do_post_cpus_up_work, is added so we can hook other calls here later
(e.g. boot mode logging).

Cc: Andre Przywara <andre.przywara@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Fixes: e039ee4ee3 ("arm64: add alternative runtime patching")
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Rutland 2015-03-13 16:14:34 +00:00 committed by Will Deacon
parent 1baa82f480
commit 137650aad9
4 changed files with 19 additions and 1 deletions
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4
arch/arm64/Kconfig
View File

@ -470,6 +470,10 @@ config HOTPLUG_CPU
source kernel/Kconfig.preempt
config UP_LATE_INIT
def_bool y
depends on !SMP
config HZ
int
default 100

2
arch/arm64/include/asm/smp_plat.h
View File

@ -40,4 +40,6 @@ static inline u32 mpidr_hash_size(void)
extern u64 __cpu_logical_map[NR_CPUS];
#define cpu_logical_map(cpu) __cpu_logical_map[cpu]
void __init do_post_cpus_up_work(void);
#endif /* __ASM_SMP_PLAT_H */

12
arch/arm64/kernel/setup.c
View File

@ -207,6 +207,18 @@ static void __init smp_build_mpidr_hash(void)
}
#endif
void __init do_post_cpus_up_work(void)
{
apply_alternatives_all();
}
#ifdef CONFIG_UP_LATE_INIT
void __init up_late_init(void)
{
do_post_cpus_up_work();
}
#endif /* CONFIG_UP_LATE_INIT */
static void __init setup_processor(void)
{
struct cpu_info *cpu_info;

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

@ -309,7 +309,7 @@ void cpu_die(void)
void __init smp_cpus_done(unsigned int max_cpus)
{
pr_info("SMP: Total of %d processors activated.\n", num_online_cpus());
apply_alternatives_all();
do_post_cpus_up_work();
}
void __init smp_prepare_boot_cpu(void)