* [PATCH] arm64: Fix incorrect per-cpu usage for boot CPU
@ 2016-07-21 10:12 Suzuki K Poulose
2016-07-21 10:33 ` Mark Rutland
2016-07-21 15:02 ` Catalin Marinas
0 siblings, 2 replies; 3+ messages in thread
From: Suzuki K Poulose @ 2016-07-21 10:12 UTC (permalink / raw)
To: linux-arm-kernel
In smp_prepare_boot_cpu(), we invoke cpuinfo_store_boot_cpu to store
the cpuinfo in a per-cpu ptr, before initialising the per-cpu offset for
the boot CPU. This patch reorders the sequence to make sure we initialise
the per-cpu offset before accessing the per-cpu area.
Commit 4b998ff1885eec ("arm64: Delay cpuinfo_store_boot_cpu") fixed the
issue where we modified the per-cpu area even before the kernel initialises
the per-cpu areas, but failed to wait until the boot cpu updated it's
offset.
Fixes: commit 4b998ff1885eec ("arm64: Delay cpuinfo_store_boot_cpu")
Cc: <stable@vger.kernel.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
arch/arm64/kernel/smp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 62ff3c0..d242e81 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -437,9 +437,9 @@ void __init smp_cpus_done(unsigned int max_cpus)
void __init smp_prepare_boot_cpu(void)
{
+ set_my_cpu_offset(per_cpu_offset(smp_processor_id()));
cpuinfo_store_boot_cpu();
save_boot_cpu_run_el();
- set_my_cpu_offset(per_cpu_offset(smp_processor_id()));
}
static u64 __init of_get_cpu_mpidr(struct device_node *dn)
--
2.7.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH] arm64: Fix incorrect per-cpu usage for boot CPU
2016-07-21 10:12 [PATCH] arm64: Fix incorrect per-cpu usage for boot CPU Suzuki K Poulose
@ 2016-07-21 10:33 ` Mark Rutland
2016-07-21 15:02 ` Catalin Marinas
1 sibling, 0 replies; 3+ messages in thread
From: Mark Rutland @ 2016-07-21 10:33 UTC (permalink / raw)
To: linux-arm-kernel
On Thu, Jul 21, 2016 at 11:12:55AM +0100, Suzuki K Poulose wrote:
> In smp_prepare_boot_cpu(), we invoke cpuinfo_store_boot_cpu to store
> the cpuinfo in a per-cpu ptr, before initialising the per-cpu offset for
> the boot CPU. This patch reorders the sequence to make sure we initialise
> the per-cpu offset before accessing the per-cpu area.
>
> Commit 4b998ff1885eec ("arm64: Delay cpuinfo_store_boot_cpu") fixed the
> issue where we modified the per-cpu area even before the kernel initialises
> the per-cpu areas, but failed to wait until the boot cpu updated it's
> offset.
>
> Fixes: commit 4b998ff1885eec ("arm64: Delay cpuinfo_store_boot_cpu")
> Cc: <stable@vger.kernel.org>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Mark.
> ---
> arch/arm64/kernel/smp.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
> index 62ff3c0..d242e81 100644
> --- a/arch/arm64/kernel/smp.c
> +++ b/arch/arm64/kernel/smp.c
> @@ -437,9 +437,9 @@ void __init smp_cpus_done(unsigned int max_cpus)
>
> void __init smp_prepare_boot_cpu(void)
> {
> + set_my_cpu_offset(per_cpu_offset(smp_processor_id()));
> cpuinfo_store_boot_cpu();
> save_boot_cpu_run_el();
> - set_my_cpu_offset(per_cpu_offset(smp_processor_id()));
> }
>
> static u64 __init of_get_cpu_mpidr(struct device_node *dn)
> --
> 2.7.4
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH] arm64: Fix incorrect per-cpu usage for boot CPU
2016-07-21 10:12 [PATCH] arm64: Fix incorrect per-cpu usage for boot CPU Suzuki K Poulose
2016-07-21 10:33 ` Mark Rutland
@ 2016-07-21 15:02 ` Catalin Marinas
1 sibling, 0 replies; 3+ messages in thread
From: Catalin Marinas @ 2016-07-21 15:02 UTC (permalink / raw)
To: linux-arm-kernel
On Thu, Jul 21, 2016 at 11:12:55AM +0100, Suzuki K. Poulose wrote:
> In smp_prepare_boot_cpu(), we invoke cpuinfo_store_boot_cpu to store
> the cpuinfo in a per-cpu ptr, before initialising the per-cpu offset for
> the boot CPU. This patch reorders the sequence to make sure we initialise
> the per-cpu offset before accessing the per-cpu area.
>
> Commit 4b998ff1885eec ("arm64: Delay cpuinfo_store_boot_cpu") fixed the
> issue where we modified the per-cpu area even before the kernel initialises
> the per-cpu areas, but failed to wait until the boot cpu updated it's
> offset.
>
> Fixes: commit 4b998ff1885eec ("arm64: Delay cpuinfo_store_boot_cpu")
> Cc: <stable@vger.kernel.org>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Applied. Thanks.
--
Catalin
^ permalink raw reply [flat|nested] 3+ messages in thread
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2016-07-21 10:33 ` Mark Rutland
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