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Subject[PATCH next] ocfs2: Reduce object size of mlog uses
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Using a function for __mlog_printk instead of a macro
reduces the object size of built-in.o more than 120KB, or
~10% overall (x86-64 defconfig with all ocfs2 options)

$ size fs/ocfs2/built-in.o*
text data bss dec hex filename
936255 118071 134408 1188734 12237e fs/ocfs2/built-in.o.new
1064081 118071 134408 1316560 1416d0 fs/ocfs2/built-in.o.old

Miscellanea:

o Neaten macros around the __mlog_printk uses.
o Use __func__ for __PRETTY_FUNCTION__
o Use ##__VA_ARGS__ for args...

Signed-off-by: Joe Perches <joe@perches.com>
---
Compiled/untested

fs/ocfs2/cluster/masklog.c | 17 +++++++++++++++++
fs/ocfs2/cluster/masklog.h | 28 +++++++++++++++++-----------
2 files changed, 34 insertions(+), 11 deletions(-)

diff --git a/fs/ocfs2/cluster/masklog.c b/fs/ocfs2/cluster/masklog.c
index af7598b..5b7a351 100644
--- a/fs/ocfs2/cluster/masklog.c
+++ b/fs/ocfs2/cluster/masklog.c
@@ -64,6 +64,23 @@ static ssize_t mlog_mask_store(u64 mask, const char *buf, size_t count)
return count;
}

+void __mlog_printk(const char *level, const char *func, int line,
+ const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ va_start(args, fmt);
+
+ vaf.fmt = fmt;
+ vaf.va = &args;
+
+ printk("%s(%s,%u,%lu):%s:%d %pV",
+ level, current->comm, task_pid_nr(current), __mlog_cpu_guess,
+ func, line, &vaf);
+
+ va_end(args);
+}
struct mlog_attribute {
struct attribute attr;
u64 mask;
diff --git a/fs/ocfs2/cluster/masklog.h b/fs/ocfs2/cluster/masklog.h
index 7fdc25a..6036e6a 100644
--- a/fs/ocfs2/cluster/masklog.h
+++ b/fs/ocfs2/cluster/masklog.h
@@ -168,7 +168,8 @@ extern struct mlog_bits mlog_and_bits, mlog_not_bits;
* scream. just do this instead of trying to guess which we're building
* against.. *sigh*.
*/
-#define __mlog_cpu_guess ({ \
+#define __mlog_cpu_guess \
+({ \
unsigned long _cpu = get_cpu(); \
put_cpu(); \
_cpu; \
@@ -178,21 +179,25 @@ extern struct mlog_bits mlog_and_bits, mlog_not_bits;
* before ##args is intentional. Otherwise, gcc 2.95 will eat the
* previous token if args expands to nothing.
*/
-#define __mlog_printk(level, fmt, args...) \
- printk(level "(%s,%u,%lu):%s:%d " fmt, current->comm, \
- task_pid_nr(current), __mlog_cpu_guess, \
- __PRETTY_FUNCTION__, __LINE__ , ##args)
+__printf(4, 5)
+void __mlog_printk(const char *level, const char *func, int line,
+ const char *fmt, ...);

-#define mlog(mask, fmt, args...) do { \
+#define mlog(mask, fmt, ...) \
+do { \
u64 __m = MLOG_MASK_PREFIX | (mask); \
if ((__m & ML_ALLOWED_BITS) && \
__mlog_test_u64(__m, mlog_and_bits) && \
!__mlog_test_u64(__m, mlog_not_bits)) { \
if (__m & ML_ERROR) \
- __mlog_printk(KERN_ERR, "ERROR: "fmt , ##args); \
+ __mlog_printk(KERN_ERR, __func__, __LINE__, \
+ "ERROR: " fmt, ##__VA_ARGS__); \
else if (__m & ML_NOTICE) \
- __mlog_printk(KERN_NOTICE, fmt , ##args); \
- else __mlog_printk(KERN_INFO, fmt , ##args); \
+ __mlog_printk(KERN_NOTICE, __func__, __LINE__, \
+ fmt, ##__VA_ARGS__); \
+ else \
+ __mlog_printk(KERN_INFO, __func__, __LINE__, \
+ fmt, ##__VA_ARGS__); \
} \
} while (0)

@@ -205,10 +210,11 @@ extern struct mlog_bits mlog_and_bits, mlog_not_bits;
_st; \
})

-#define mlog_bug_on_msg(cond, fmt, args...) do { \
+#define mlog_bug_on_msg(cond, fmt, ...) \
+do { \
if (cond) { \
mlog(ML_ERROR, "bug expression: " #cond "\n"); \
- mlog(ML_ERROR, fmt, ##args); \
+ mlog(ML_ERROR, fmt, ##__VA_ARGS__); \
BUG(); \
} \
} while (0)



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