This is a note to let you know that I've just added the patch titled arm64: apply alternatives for !SMP kernels to the 4.0-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: arm64-apply-alternatives-for-smp-kernels.patch and it can be found in the queue-4.0 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 137650aad96c9594683445e41afa8ac5a2097520 Mon Sep 17 00:00:00 2001 From: Mark Rutland <mark.rutland@xxxxxxx> Date: Fri, 13 Mar 2015 16:14:34 +0000 Subject: arm64: apply alternatives for !SMP kernels From: Mark Rutland <mark.rutland@xxxxxxx> commit 137650aad96c9594683445e41afa8ac5a2097520 upstream. 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@xxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Fixes: e039ee4ee3fcf174 ("arm64: add alternative runtime patching") Tested-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx> Signed-off-by: Will Deacon <will.deacon@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/arm64/Kconfig | 4 ++++ arch/arm64/include/asm/smp_plat.h | 2 ++ arch/arm64/kernel/setup.c | 12 ++++++++++++ arch/arm64/kernel/smp.c | 2 +- 4 files changed, 19 insertions(+), 1 deletion(-) --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -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 --- a/arch/arm64/include/asm/smp_plat.h +++ b/arch/arm64/include/asm/smp_plat.h @@ -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 */ --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -207,6 +207,18 @@ static void __init smp_build_mpidr_hash( } #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; --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -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) Patches currently in stable-queue which might be from mark.rutland@xxxxxxx are queue-4.0/arm64-head.s-ensure-visibility-of-page-tables.patch queue-4.0/arm64-apply-alternatives-for-smp-kernels.patch queue-4.0/arm64-errata-add-workaround-for-cortex-a53-erratum-845719.patch queue-4.0/drivers-base-cacheinfo-validate-device-node-for-all-the-caches.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html