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dev_dbg/dynamic_debug: Update to use printk_emit, optimize stack

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commit c4e00daaa9
("driver-core: extend dev_printk() to pass structured data")
changed __dev_printk and broke dynamic-debug's ability to control the
dynamic prefix of dev_dbg(dev,..).

commit af7f2158fd
("drivers-core: make structured logging play nice with dynamic-debug")
made a minimal correction.

The current dynamic debug code uses up to 3 recursion levels via %pV.
This can consume quite a bit of stack.  Directly call printk_emit to
reduce the recursion depth.

These changes include:

dev_dbg:
o Create and use function create_syslog_header to format the syslog
  header for printk_emit uses.
o Call create_syslog_header and neaten __dev_printk
o Make __dev_printk static not global
o Remove include header declaration of __dev_printk
o Remove now unused EXPORT_SYMBOL() of __dev_printk
o Whitespace neatening

dynamic_dev_dbg:
o Remove KERN_DEBUG from dynamic_emit_prefix
o Call create_syslog_header and printk_emit
o Whitespace neatening

Signed-off-by: Joe Perches <[email protected]>
Acked-by: David S. Miller <[email protected]>
Tested-by: Jim Cromie <[email protected]>
Acked-by: Jason Baron <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Joe Perches 2012-09-12 20:11:29 -07:00 • committed by Greg Kroah-Hartman
commit 798efc60e4
3 changed files with 67 additions and 44 deletions
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64
drivers/base/core.c
View file

@ -1865,26 +1865,19 @@ void device_shutdown(void)
*/
#ifdef CONFIG_PRINTK
int __dev_printk(const char *level, const struct device *dev,
struct va_format *vaf)
int create_syslog_header(const struct device *dev, char *hdr, size_t hdrlen)
{
char dict[128];
const char *level_extra = "";
size_t dictlen = 0;
const char *subsys;
if (!dev)
return printk("%s(NULL device *): %pV", level, vaf);
size_t pos = 0;
if (dev->class)
subsys = dev->class->name;
else if (dev->bus)
subsys = dev->bus->name;
else
goto skip;
return 0;
dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen,
"SUBSYSTEM=%s", subsys);
pos += snprintf(hdr + pos, hdrlen - pos, "SUBSYSTEM=%s", subsys);
/*
* Add device identifier DEVICE=:
@ -1900,32 +1893,41 @@ int __dev_printk(const char *level, const struct device *dev,
c = 'b';
else
c = 'c';
dictlen++;
dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen,
"DEVICE=%c%u:%u",
c, MAJOR(dev->devt), MINOR(dev->devt));
pos++;
pos += snprintf(hdr + pos, hdrlen - pos,
"DEVICE=%c%u:%u",
c, MAJOR(dev->devt), MINOR(dev->devt));
} else if (strcmp(subsys, "net") == 0) {
struct net_device *net = to_net_dev(dev);
dictlen++;
dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen,
"DEVICE=n%u", net->ifindex);
pos++;
pos += snprintf(hdr + pos, hdrlen - pos,
"DEVICE=n%u", net->ifindex);
} else {
dictlen++;
dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen,
"DEVICE=+%s:%s", subsys, dev_name(dev));
pos++;
pos += snprintf(hdr + pos, hdrlen - pos,
"DEVICE=+%s:%s", subsys, dev_name(dev));
}
skip:
if (level[2])
level_extra = &level[2]; /* skip past KERN_SOH "L" */
return printk_emit(0, level[1] - '0',
dictlen ? dict : NULL, dictlen,
"%s %s: %s%pV",
dev_driver_string(dev), dev_name(dev),
level_extra, vaf);
return pos;
}
EXPORT_SYMBOL(create_syslog_header);
static int __dev_printk(const char *level, const struct device *dev,
struct va_format *vaf)
{
char hdr[128];
size_t hdrlen;
if (!dev)
return printk("%s(NULL device *): %pV", level, vaf);
hdrlen = create_syslog_header(dev, hdr, sizeof(hdr));
return printk_emit(0, level[1] - '0', hdrlen ? hdr : NULL, hdrlen,
"%s %s: %pV",
dev_driver_string(dev), dev_name(dev), vaf);
}
EXPORT_SYMBOL(__dev_printk);
int dev_printk(const char *level, const struct device *dev,
const char *fmt, ...)
@ -1940,6 +1942,7 @@ int dev_printk(const char *level, const struct device *dev,
vaf.va = &args;
r = __dev_printk(level, dev, &vaf);
va_end(args);
return r;
@ -1959,6 +1962,7 @@ int func(const struct device *dev, const char *fmt, ...) \
vaf.va = &args; \
\
r = __dev_printk(kern_level, dev, &vaf); \
\
va_end(args); \
\
return r; \