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Message-Id: <20230913-jag-sysctl_remove_empty_elem_arch-v2-2-d1bd13a29bae@samsung.com>
Date: Wed, 13 Sep 2023 11:10:56 +0200
From: Joel Granados via B4 Relay
<devnull+j.granados.samsung.com@...nel.org>
To: Luis Chamberlain <mcgrof@...nel.org>, willy@...radead.org,
josh@...htriplett.org, Kees Cook <keescook@...omium.org>,
Iurii Zaikin <yzaikin@...gle.com>,
Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>,
Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
Russell King <linux@...linux.org.uk>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>,
Andy Lutomirski <luto@...nel.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Guo Ren <guoren@...nel.org>, Alexey Gladkov <legion@...nel.org>
Cc: linux-fsdevel@...r.kernel.org, linux-s390@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-riscv@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
linux-ia64@...r.kernel.org, linux-csky@...r.kernel.org,
Joel Granados <j.granados@...sung.com>
Subject: [PATCH v2 2/8] arm: Remove now superfluous sentinel elem from
ctl_table arrays
From: Joel Granados <j.granados@...sung.com>
This commit comes at the tail end of a greater effort to remove the
empty elements at the end of the ctl_table arrays (sentinels) which
will reduce the overall build time size of the kernel and run time
memory bloat by ~64 bytes per sentinel (further information Link :
https://lore.kernel.org/all/ZO5Yx5JFogGi%2FcBo@bombadil.infradead.org/)
Removed the sentinel as well as the explicit size from ctl_isa_vars. The
size is redundant as the initialization sets it. Changed
insn_emulation->sysctl from a 2 element array of struct ctl_table to a
simple struct. This has no consequence for the sysctl registration as it
is forwarded as a pointer. Removed sentinel from sve_defatul_vl_table,
sme_default_vl_table, tagged_addr_sysctl_table and
armv8_pmu_sysctl_table.
This removal is safe because register_sysctl_sz and register_sysctl use
the array size in addition to checking for the sentinel.
Signed-off-by: Joel Granados <j.granados@...sung.com>
---
arch/arm/kernel/isa.c | 4 ++--
arch/arm64/kernel/armv8_deprecated.c | 8 +++-----
arch/arm64/kernel/fpsimd.c | 6 ++----
arch/arm64/kernel/process.c | 3 +--
drivers/perf/arm_pmuv3.c | 3 +--
5 files changed, 9 insertions(+), 15 deletions(-)
diff --git a/arch/arm/kernel/isa.c b/arch/arm/kernel/isa.c
index 20218876bef2..0b9c28077092 100644
--- a/arch/arm/kernel/isa.c
+++ b/arch/arm/kernel/isa.c
@@ -16,7 +16,7 @@
static unsigned int isa_membase, isa_portbase, isa_portshift;
-static struct ctl_table ctl_isa_vars[4] = {
+static struct ctl_table ctl_isa_vars[] = {
{
.procname = "membase",
.data = &isa_membase,
@@ -35,7 +35,7 @@ static struct ctl_table ctl_isa_vars[4] = {
.maxlen = sizeof(isa_portshift),
.mode = 0444,
.proc_handler = proc_dointvec,
- }, {}
+ }
};
static struct ctl_table_header *isa_sysctl_header;
diff --git a/arch/arm64/kernel/armv8_deprecated.c b/arch/arm64/kernel/armv8_deprecated.c
index e459cfd33711..dd6ce86d4332 100644
--- a/arch/arm64/kernel/armv8_deprecated.c
+++ b/arch/arm64/kernel/armv8_deprecated.c
@@ -52,10 +52,8 @@ struct insn_emulation {
int min;
int max;
- /*
- * sysctl for this emulation + a sentinal entry.
- */
- struct ctl_table sysctl[2];
+ /* sysctl for this emulation */
+ struct ctl_table sysctl;
};
#define ARM_OPCODE_CONDTEST_FAIL 0
@@ -558,7 +556,7 @@ static void __init register_insn_emulation(struct insn_emulation *insn)
update_insn_emulation_mode(insn, INSN_UNDEF);
if (insn->status != INSN_UNAVAILABLE) {
- sysctl = &insn->sysctl[0];
+ sysctl = &insn->sysctl;
sysctl->mode = 0644;
sysctl->maxlen = sizeof(int);
diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
index 91e44ac7150f..db3ad1ba8272 100644
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -588,8 +588,7 @@ static struct ctl_table sve_default_vl_table[] = {
.mode = 0644,
.proc_handler = vec_proc_do_default_vl,
.extra1 = &vl_info[ARM64_VEC_SVE],
- },
- { }
+ }
};
static int __init sve_sysctl_init(void)
@@ -612,8 +611,7 @@ static struct ctl_table sme_default_vl_table[] = {
.mode = 0644,
.proc_handler = vec_proc_do_default_vl,
.extra1 = &vl_info[ARM64_VEC_SME],
- },
- { }
+ }
};
static int __init sme_sysctl_init(void)
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 0fcc4eb1a7ab..48861cdc3aae 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -723,8 +723,7 @@ static struct ctl_table tagged_addr_sysctl_table[] = {
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
- },
- { }
+ }
};
static int __init tagged_addr_init(void)
diff --git a/drivers/perf/arm_pmuv3.c b/drivers/perf/arm_pmuv3.c
index e5a2ac4155f6..c4aa6a8d1b05 100644
--- a/drivers/perf/arm_pmuv3.c
+++ b/drivers/perf/arm_pmuv3.c
@@ -1172,8 +1172,7 @@ static struct ctl_table armv8_pmu_sysctl_table[] = {
.proc_handler = armv8pmu_proc_user_access_handler,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
- },
- { }
+ }
};
static void armv8_pmu_register_sysctl_table(void)
--
2.30.2
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