[PATCH v2 1/8] S390: Remove now superfluous sentinel elem from ctl_table arrays
Joel Granados via B4 Relay
devnull+j.granados.samsung.com at kernel.org
Wed Sep 13 02:10:55 PDT 2023
From: Joel Granados <j.granados at samsung.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/)
Remove the sentinel element from appldata_table, s390dbf_table,
topology_ctl_table, cmm_table and page_table_sysctl. Reduced the memory
allocation in appldata_register_ops by 1 effectively removing the
sentinel from ops->ctl_table.
This removal is safe because register_sysctl_sz and register_sysctl use
the array size in addition to checking for the sentinel.
Tested-by: Alexander Gordeev <agordeev at linux.ibm.com>
Acked-by: Heiko Carstens <hca at linux.ibm.com>
Signed-off-by: Joel Granados <j.granados at samsung.com>
---
arch/s390/appldata/appldata_base.c | 6 ++----
arch/s390/kernel/debug.c | 3 +--
arch/s390/kernel/topology.c | 3 +--
arch/s390/mm/cmm.c | 3 +--
arch/s390/mm/pgalloc.c | 3 +--
5 files changed, 6 insertions(+), 12 deletions(-)
diff --git a/arch/s390/appldata/appldata_base.c b/arch/s390/appldata/appldata_base.c
index 3b0994625652..872a644b1fd1 100644
--- a/arch/s390/appldata/appldata_base.c
+++ b/arch/s390/appldata/appldata_base.c
@@ -62,8 +62,7 @@ static struct ctl_table appldata_table[] = {
.procname = "interval",
.mode = S_IRUGO | S_IWUSR,
.proc_handler = appldata_interval_handler,
- },
- { },
+ }
};
/*
@@ -351,8 +350,7 @@ int appldata_register_ops(struct appldata_ops *ops)
if (ops->size > APPLDATA_MAX_REC_SIZE)
return -EINVAL;
- /* The last entry must be an empty one */
- ops->ctl_table = kcalloc(2, sizeof(struct ctl_table), GFP_KERNEL);
+ ops->ctl_table = kcalloc(1, sizeof(struct ctl_table), GFP_KERNEL);
if (!ops->ctl_table)
return -ENOMEM;
diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c
index a85e0c3e7027..150e2bfff0b3 100644
--- a/arch/s390/kernel/debug.c
+++ b/arch/s390/kernel/debug.c
@@ -977,8 +977,7 @@ static struct ctl_table s390dbf_table[] = {
.maxlen = sizeof(int),
.mode = S_IRUGO | S_IWUSR,
.proc_handler = s390dbf_procactive,
- },
- { }
+ }
};
static struct ctl_table_header *s390dbf_sysctl_header;
diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c
index 68adf1de8888..9dcfac416669 100644
--- a/arch/s390/kernel/topology.c
+++ b/arch/s390/kernel/topology.c
@@ -635,8 +635,7 @@ static struct ctl_table topology_ctl_table[] = {
.procname = "topology",
.mode = 0644,
.proc_handler = topology_ctl_handler,
- },
- { },
+ }
};
static int __init topology_init(void)
diff --git a/arch/s390/mm/cmm.c b/arch/s390/mm/cmm.c
index f47515313226..8937aa7090b3 100644
--- a/arch/s390/mm/cmm.c
+++ b/arch/s390/mm/cmm.c
@@ -331,8 +331,7 @@ static struct ctl_table cmm_table[] = {
.procname = "cmm_timeout",
.mode = 0644,
.proc_handler = cmm_timeout_handler,
- },
- { }
+ }
};
#ifdef CONFIG_CMM_IUCV
diff --git a/arch/s390/mm/pgalloc.c b/arch/s390/mm/pgalloc.c
index 07fc660a24aa..e8cecd31715f 100644
--- a/arch/s390/mm/pgalloc.c
+++ b/arch/s390/mm/pgalloc.c
@@ -29,8 +29,7 @@ static struct ctl_table page_table_sysctl[] = {
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
- },
- { }
+ }
};
static int __init page_table_register_sysctl(void)
--
2.30.2
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