sysctl: Replace do_proc_do{int,ulong,uint}vec with do_proc_vec

Make do_proc_vec static and parametrize by proc_vec_type enum which
defines the type being processed and selects which converter is "live".
Signed-ness and size are calculated based on proc_vec_type and
table->data is now walked as raw bytes and advanced by the element size;
the converter still performs the actual typed load/store. Pass converter
as a union to avoid a cast from void*. The public
proc_do{int,uint,ulong}vec_conv() prototypes and all converter
signatures in kernel/, fs/ and the header are therefore unchanged.

Remove do_proc_doulongvec_minmax. proc_doulongvec_minmax_conv uses a
converter callback passed by the caller instead of conversions based on
conv{mul,div}. Create uni and bi-direction converters for milliseconds
to jiffies in proc_doulongvec_ms_jiffies_minmax; which is the only user
of proc_doulongvec_minmax_conv.

Replace do_proc_douintvec{,_w,_r} functions with a call to do_proc_vec.
Disallow vectors for uint by returning -EINVAL when more than one
element is detected.

Signed-off-by: Joel Granados <joel.granados@kernel.org>

1 files changed, 25 insertions, 1 deletions

diff --git a/kernel/time/jiffies.c b/kernel/time/jiffies.c
index d51428867a33..01e634fdcfd0 100644
--- a/kernel/time/jiffies.c
+++ b/kernel/time/jiffies.c
@@ -185,6 +185,24 @@ static int do_proc_int_conv_ms_jiffies_minmax(bool *negp, ulong *u_ptr,
 			     sysctl_u2k_int_conv_ms, sysctl_k2u_int_conv_ms);
 }
 
+static int sysctl_u2k_ulong_conv_ms(const ulong *u_ptr, ulong *k_ptr)
+{
+	return proc_ulong_u2k_conv_uop(u_ptr, k_ptr, sysctl_msecs_to_jiffies);
+}
+
+static int sysctl_k2u_ulong_conv_ms(ulong *u_ptr, const ulong *k_ptr)
+{
+	return proc_ulong_k2u_conv_kop(u_ptr, k_ptr, sysctl_jiffies_to_msecs);
+}
+
+static int do_proc_ulong_conv_ms_jiffies(bool *negp, ulong *u_ptr, ulong *k_ptr,
+					 int dir, const struct ctl_table *tbl)
+{
+	return proc_ulong_conv(u_ptr, k_ptr, dir, tbl, false,
+			       sysctl_u2k_ulong_conv_ms, sysctl_k2u_ulong_conv_ms);
+}
+
+
 #else // CONFIG_PROC_SYSCTL
 static int do_proc_int_conv_jiffies(bool *negp, ulong *u_ptr, int *k_ptr,
 				    int dir, const struct ctl_table *tbl)
@@ -211,6 +229,12 @@ static int do_proc_int_conv_ms_jiffies_minmax(bool *negp, ulong *u_ptr,
 {
 	return -ENOSYS;
 }
+
+static int do_proc_ulong_conv_ms_jiffies(bool *negp, ulong *u_ptr, ulong *k_ptr,
+					 int dir, const struct ctl_table *tbl)
+{
+	return -ENOSYS;
+}
 #endif
 
 /**
@@ -310,7 +334,7 @@ int proc_doulongvec_ms_jiffies_minmax(const struct ctl_table *table, int dir,
 				      void *buffer, size_t *lenp, loff_t *ppos)
 {
 	return proc_doulongvec_minmax_conv(table, dir, buffer, lenp, ppos,
-					   HZ, 1000l);
+					   do_proc_ulong_conv_ms_jiffies);
 }
 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);