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Subject[PATCH v4 10/16] dyndbg: combine flags & mask into a struct, use that
Date
combine flags & mask into a struct, and replace those 2 parameters in
3 functions: ddebug_change, ddebug_parse_flags, ddebug_read_flags,
altering the derefs in them accordingly.

This simplifies the 3 function sigs, preparing for more changes.
We dont yet need mask from ddebug_read_flags, but will soon.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
lib/dynamic_debug.c | 46 +++++++++++++++++++++++----------------------
1 file changed, 24 insertions(+), 22 deletions(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 839f89b24474..0d1b3dbdec1d 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -64,6 +64,11 @@ struct ddebug_iter {

struct flagsbuf { char buf[12]; }; /* big enough to hold all the flags */

+struct flagsettings {
+ unsigned int flags;
+ unsigned int mask;
+};
+
static DEFINE_MUTEX(ddebug_lock);
static LIST_HEAD(ddebug_tables);
static int verbose;
@@ -142,7 +147,7 @@ static void vpr_info_dq(const struct ddebug_query *query, const char *msg)
* logs the changes. Takes ddebug_lock.
*/
static int ddebug_change(const struct ddebug_query *query,
- unsigned int pflags, unsigned int mask)
+ struct flagsettings *mods)
{
int i;
struct ddebug_table *dt;
@@ -191,14 +196,14 @@ static int ddebug_change(const struct ddebug_query *query,

nfound++;

- newflags = (dp->flags & mask) | pflags;
+ newflags = (dp->flags & mods->mask) | mods->flags;
if (newflags == dp->flags)
continue;
#ifdef CONFIG_JUMP_LABEL
if (dp->flags & _DPRINTK_FLAGS_PRINT) {
- if (!(pflags & _DPRINTK_FLAGS_PRINT))
+ if (!(mods->flags & _DPRINTK_FLAGS_PRINT))
static_branch_disable(&dp->key.dd_key_true);
- } else if (pflags & _DPRINTK_FLAGS_PRINT)
+ } else if (mods->flags & _DPRINTK_FLAGS_PRINT)
static_branch_enable(&dp->key.dd_key_true);
#endif
dp->flags = newflags;
@@ -414,14 +419,14 @@ static int ddebug_parse_query(char *words[], int nwords,
return 0;
}

-static int ddebug_read_flags(const char *str, unsigned int *flags)
+static int ddebug_read_flags(const char *str, struct flagsettings *f)
{
int i;

for (; *str ; ++str) {
for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) {
if (*str == opt_array[i].opt_char) {
- *flags |= opt_array[i].flag;
+ f->flags |= opt_array[i].flag;
break;
}
}
@@ -430,7 +435,7 @@ static int ddebug_read_flags(const char *str, unsigned int *flags)
return -EINVAL;
}
}
- vpr_info("flags=0x%x\n", *flags);
+ vpr_info("flags=0x%x mask=0x%x\n", f->flags, f->mask);
return 0;
}

@@ -440,10 +445,8 @@ static int ddebug_read_flags(const char *str, unsigned int *flags)
* flags fields of matched _ddebug's. Returns 0 on success
* or <0 on error.
*/
-static int ddebug_parse_flags(const char *str, unsigned int *flagsp,
- unsigned int *maskp)
+static int ddebug_parse_flags(const char *str, struct flagsettings *mods)
{
- unsigned flags = 0;
int op;

switch (*str) {
@@ -458,31 +461,30 @@ static int ddebug_parse_flags(const char *str, unsigned int *flagsp,
}
vpr_info("op='%c'\n", op);

- if (ddebug_read_flags(str, &flags))
+ if (ddebug_read_flags(str, mods))
return -EINVAL;

- /* calculate final *flagsp, *maskp according to mask and op */
+ /* calculate final flags, mask based upon op */
switch (op) {
case '=':
- *maskp = 0;
- *flagsp = flags;
+ mods->mask = 0;
break;
case '+':
- *maskp = ~0U;
- *flagsp = flags;
+ mods->mask = ~0U;
break;
case '-':
- *maskp = ~flags;
- *flagsp = 0;
+ mods->mask = ~mods->flags;
+ mods->flags = 0;
break;
}
- vpr_info("*flagsp=0x%x *maskp=0x%x\n", *flagsp, *maskp);
+ vpr_info("*flagsp=0x%x *maskp=0x%x\n", mods->flags, mods->mask);
+
return 0;
}

static int ddebug_exec_query(char *query_string, const char *modname)
{
- unsigned int flags = 0, mask = 0;
+ struct flagsettings mods = {};
struct ddebug_query query;
#define MAXWORDS 9
int nwords, nfound;
@@ -494,7 +496,7 @@ static int ddebug_exec_query(char *query_string, const char *modname)
return -EINVAL;
}
/* check flags 1st (last arg) so query is pairs of spec,val */
- if (ddebug_parse_flags(words[nwords-1], &flags, &mask)) {
+ if (ddebug_parse_flags(words[nwords-1], &mods)) {
pr_err("flags parse failed\n");
return -EINVAL;
}
@@ -503,7 +505,7 @@ static int ddebug_exec_query(char *query_string, const char *modname)
return -EINVAL;
}
/* actually go and implement the change */
- nfound = ddebug_change(&query, flags, mask);
+ nfound = ddebug_change(&query, &mods);
vpr_info_dq(&query, nfound ? "applied" : "no-match");

return nfound;
--
2.23.0
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