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Message-ID: <20231012194711.3288031-2-jim.cromie@gmail.com>
Date: Thu, 12 Oct 2023 13:47:02 -0600
From: Jim Cromie <jim.cromie@...il.com>
To: linux-kernel@...r.kernel.org
Cc: david@...hat.com, Liam.Howlett@...cle.com, linux-mm@...ck.org,
Jim Cromie <jim.cromie@...il.com>
Subject: [RFC PATCH 01/10] dyndbg: prep to isolate 3 repetetive fields
Move 3 fields: modname, filename, function into an anonymous struct,
and rename with '_' prefix to catch stale uses.
Add 3 desc_*() macros to abstract the field refs.
Add DYNAMIC_DEBUG_SITE_INIT() to initialize the fields.
no functional change.
Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
include/linux/dynamic_debug.h | 22 ++++++++++++++++------
lib/dynamic_debug.c | 28 ++++++++++++++--------------
2 files changed, 30 insertions(+), 20 deletions(-)
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index 2237d454bc19..aacfafc466c0 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -13,14 +13,17 @@
* ELF section at every dynamic debug callsite. At runtime,
* the special section is treated as an array of these.
*/
+
struct _ddebug {
/*
* These fields are used to drive the user interface
* for selecting and displaying debug callsites.
*/
- const char *modname;
- const char *function;
- const char *filename;
+ struct /* _ddebug_site */ {
+ const char *_modname;
+ const char *_function;
+ const char *_filename;
+ };
const char *format;
unsigned int lineno:18;
#define CLS_BITS 6
@@ -61,6 +64,10 @@ struct _ddebug {
#endif
} __attribute__((aligned(8)));
+#define desc_modname(d) (d)->modname
+#define desc_filename(d) (d)->filename
+#define desc_function(d) (d)->function
+
enum ddebug_class_map_type {
DD_CLASS_TYPE_DISJOINT_BITS,
/**
@@ -213,12 +220,15 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
const struct ib_device *ibdev,
const char *fmt, ...);
+#define DYNAMIC_DEBUG_SITE_INIT() \
+ ._modname = KBUILD_MODNAME, \
+ ._function = __func__, \
+ ._filename = __FILE__
+
#define DEFINE_DYNAMIC_DEBUG_METADATA_CLS(name, cls, fmt) \
static struct _ddebug __aligned(8) \
__section("__dyndbg") name = { \
- .modname = KBUILD_MODNAME, \
- .function = __func__, \
- .filename = __FILE__, \
+ DYNAMIC_DEBUG_SITE_INIT(), \
.format = (fmt), \
.lineno = __LINE__, \
.flags = _DPRINTK_FLAGS_DEFAULT, \
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 3dc512fb1d66..c0e595483cb9 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -235,16 +235,16 @@ static int ddebug_change(const struct ddebug_query *query,
/* match against the source filename */
if (query->filename &&
- !match_wildcard(query->filename, dp->filename) &&
+ !match_wildcard(query->filename, desc_filename(dp)) &&
!match_wildcard(query->filename,
- kbasename(dp->filename)) &&
+ kbasename(desc_filename(dp))) &&
!match_wildcard(query->filename,
- trim_prefix(dp->filename)))
+ trim_prefix(desc_filename(dp))))
continue;
/* match against the function */
if (query->function &&
- !match_wildcard(query->function, dp->function))
+ !match_wildcard(query->function, desc_function(dp)))
continue;
/* match against the format */
@@ -281,8 +281,8 @@ static int ddebug_change(const struct ddebug_query *query,
}
#endif
v4pr_info("changed %s:%d [%s]%s %s => %s\n",
- trim_prefix(dp->filename), dp->lineno,
- dt->mod_name, dp->function,
+ trim_prefix(desc_filename(dp)), dp->lineno,
+ dt->mod_name, desc_function(dp),
ddebug_describe_flags(dp->flags, &fbuf),
ddebug_describe_flags(newflags, &nbuf));
dp->flags = newflags;
@@ -781,13 +781,13 @@ static int __dynamic_emit_prefix(const struct _ddebug *desc, char *buf, int pos)
{
if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME)
pos += snprintf(buf + pos, remaining(pos), "%s:",
- desc->modname);
+ desc_modname(desc));
if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME)
pos += snprintf(buf + pos, remaining(pos), "%s:",
- desc->function);
+ desc_function(desc));
if (desc->flags & _DPRINTK_FLAGS_INCL_SOURCENAME)
pos += snprintf(buf + pos, remaining(pos), "%s:",
- trim_prefix(desc->filename));
+ trim_prefix(desc_filename(desc)));
return pos;
}
@@ -1110,8 +1110,8 @@ static int ddebug_proc_show(struct seq_file *m, void *p)
}
seq_printf(m, "%s:%u [%s]%s =%s \"",
- trim_prefix(dp->filename), dp->lineno,
- iter->table->mod_name, dp->function,
+ trim_prefix(desc_filename(dp)), dp->lineno,
+ iter->table->mod_name, desc_function(dp),
ddebug_describe_flags(dp->flags, &flags));
seq_escape_str(m, dp->format, ESCAPE_SPACE, "\t\r\n\"");
seq_puts(m, "\"");
@@ -1528,12 +1528,12 @@ static int __init dynamic_debug_init(void)
}
iter = iter_mod_start = __start___dyndbg;
- modname = iter->modname;
+ modname = desc_modname(iter);
i = mod_sites = mod_ct = 0;
for (; iter < __stop___dyndbg; iter++, i++, mod_sites++) {
- if (strcmp(modname, iter->modname)) {
+ if (strcmp(modname, desc_modname(iter))) {
mod_ct++;
di.num_descs = mod_sites;
di.descs = iter_mod_start;
@@ -1542,7 +1542,7 @@ static int __init dynamic_debug_init(void)
goto out_err;
mod_sites = 0;
- modname = iter->modname;
+ modname = desc_modname(iter);
iter_mod_start = iter;
}
}
--
2.41.0
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