[PATCH v5 06/30] arm64: Port deprecated instruction emulation to new sysctl interface

Dave Martin
2017-10-31T15:50:58Z

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>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>

[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 a4dc115..c33b5e4 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;
}
--
2.1.4