Re: [PATCH 04/27] arm64: Port deprecated instruction emulation to new sysctl interface

Alex Bennée
2017-08-18T12:07:37Z

Dave Martin <Dave.Martin@arm.com> writes:

> Currently, armv8_deprected.c takes charge of the "abi" sysctl
> directory, which makes life difficult for other code that wants to
> register sysctls in the same directory.
>
> There is a "new" [1] sysctl registration interface that removes the
> need to define ctl_tables for parent directories explicitly, which
> is ideal here.
>
> This patch ports register_insn_emulation_sysctl() over to the
> register_sysctl() interface and removes the redundant ctl_table for
> "abi".
>
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

>
> [1] fea478d4101a (sysctl: Add register_sysctl for normal sysctl
> users)
> The commit message notes an intent to port users of the
> pre-existing interfaces over to register_sysctl(), though the
> number of users of the new interface currently appears negligible.
> ---
> arch/arm64/kernel/armv8_deprecated.c | 15 +++------------
> 1 file changed, 3 insertions(+), 12 deletions(-)
>
> diff --git a/arch/arm64/kernel/armv8_deprecated.c b/arch/arm64/kernel/armv8_deprecated.c
> index f0e6d71..e15eb2d 100644
> --- a/arch/arm64/kernel/armv8_deprecated.c
> +++ b/arch/arm64/kernel/armv8_deprecated.c
> @@ -228,15 +228,7 @@ static int emulation_proc_handler(struct ctl_table *table, int write,
> return ret;
> }
>
> -static struct ctl_table ctl_abi[] = {
> - {
> - .procname = "abi",
> - .mode = 0555,
> - },
> - { }
> -};
> -
> -static void __init register_insn_emulation_sysctl(struct ctl_table *table)
> +static void __init register_insn_emulation_sysctl(void)
> {
> unsigned long flags;
> int i = 0;
> @@ -262,8 +254,7 @@ static void __init register_insn_emulation_sysctl(struct ctl_table *table)
> }
> raw_spin_unlock_irqrestore(&insn_emulation_lock, flags);
>
> - table->child = insns_sysctl;
> - register_sysctl_table(table);
> + register_sysctl("abi", insns_sysctl);
> }
>
> /*
> @@ -644,7 +635,7 @@ static int __init armv8_deprecated_init(void)
> cpuhp_setup_state_nocalls(CPUHP_AP_ARM64_ISNDEP_STARTING,
> "arm64/isndep:starting",
> run_all_insn_set_hw_mode, NULL);
> - register_insn_emulation_sysctl(ctl_abi);
> + register_insn_emulation_sysctl();
>
> return 0;
> }

--
Alex Bennée
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