[RFC PATCH 38/39] arm64: move vector-length sysctl context to priv

[wen . yang]

From: Wen Yang <wen.yang@xxxxxxxxx>

The two default-vector-length entries borrow extra1 for a struct vl_info
pointer, which is not a bound, while the handler delegates with a local
int table.

Pass vl_info through priv and leave extra1/extra2 to the numeric bounds.

Signed-off-by: Wen Yang <wen.yang@xxxxxxxxx>
---
 arch/arm64/kernel/fpsimd.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
index ecfa21615f16..97e746bca99b 100644
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -549,15 +549,14 @@ static unsigned int find_supported_vector_length(enum vec_type type,
 static int vec_proc_do_default_vl(const struct ctl_table *table, int write,
 				  void *buffer, size_t *lenp, loff_t *ppos)
 {
-	struct vl_info *info = table->extra1;
+	struct vl_info *info = table->priv;
 	enum vec_type type = info->type;
 	int ret;
 	int vl = get_default_vl(type);
-	struct ctl_table tmp_table = {
-		.data = &vl,
-		.maxlen = sizeof(vl),
-	};
+	struct ctl_table tmp_table = *table;
 
+	tmp_table.data = &vl;
+	tmp_table.maxlen = sizeof(vl);
 	ret = proc_dointvec(&tmp_table, write, buffer, lenp, ppos);
 	if (ret || !write)
 		return ret;
@@ -578,7 +577,7 @@ static const struct ctl_table sve_default_vl_table[] = {
 		.procname	= "sve_default_vector_length",
 		.mode		= 0644,
 		.proc_handler	= vec_proc_do_default_vl,
-		.extra1		= &vl_info[ARM64_VEC_SVE],
+		.priv		= &vl_info[ARM64_VEC_SVE],
 	},
 };
 
@@ -601,7 +600,7 @@ static const struct ctl_table sme_default_vl_table[] = {
 		.procname	= "sme_default_vector_length",
 		.mode		= 0644,
 		.proc_handler	= vec_proc_do_default_vl,
-		.extra1		= &vl_info[ARM64_VEC_SME],
+		.priv		= &vl_info[ARM64_VEC_SME],
 	},
 };
 
-- 
2.25.1