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Date: Mon, 30 Nov 2020 02:52:01 -0800
From: Joe Perches <joe@...ches.com>
To: "James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>
Cc: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: Reduce object size of sdev_prefix_printk and scmd_printk calls
Avoid an extra char pointer per call for sdev_prefix_printk and scmd_printk
by integrating the KERN_LEVEL and format.
Preface the original function names with an underscore.
Create new macros that call the _ prefixed functions and coalesce the
KERN_<LEVEL> and format and split them inside the renamed functions.
Use printk_skip_level and a memcpy to a temporary inside these functions
to save the KERN_<LEVEL> for calls to dev_printk.
$ size drivers/scsi/built-in.a (defconfig x86-64)
text data bss dec
new: 262236 28965 782 291983
old: 263129 28965 782 292876
$ size drivers/scsi/built-in.a (allyesconfig x86-64)
text data bss dec
new: 14968308 2718234 165792 17852334
old: 14976884 2723130 165792 17865806
Signed-off-by: Joe Perches <joe@...ches.com>
---
drivers/scsi/scsi_logging.c | 30 ++++++++++++++++++++++--------
include/scsi/scsi_device.h | 18 +++++++++++-------
2 files changed, 33 insertions(+), 15 deletions(-)
diff --git a/drivers/scsi/scsi_logging.c b/drivers/scsi/scsi_logging.c
index 8ea44c6595ef..171c9183b0d4 100644
--- a/drivers/scsi/scsi_logging.c
+++ b/drivers/scsi/scsi_logging.c
@@ -50,12 +50,14 @@ static size_t sdev_format_header(char *logbuf, size_t logbuf_len,
return off;
}
-void sdev_prefix_printk(const char *level, const struct scsi_device *sdev,
- const char *name, const char *fmt, ...)
+void _sdev_prefix_printk(const struct scsi_device *sdev, const char *prefix,
+ const char *fmt, ...)
{
va_list args;
char *logbuf;
size_t off = 0, logbuf_len;
+ char level[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0";
+ size_t size;
if (!sdev)
return;
@@ -64,9 +66,14 @@ void sdev_prefix_printk(const char *level, const struct scsi_device *sdev,
if (!logbuf)
return;
- if (name)
+ size = printk_skip_level(fmt) - fmt;
+ memcpy(level, fmt, size);
+ level[size] = '\0';
+ fmt += size;
+
+ if (prefix)
off += scnprintf(logbuf + off, logbuf_len - off,
- "[%s] ", name);
+ "[%s] ", prefix);
if (!WARN_ON(off >= logbuf_len)) {
va_start(args, fmt);
off += vscnprintf(logbuf + off, logbuf_len - off, fmt, args);
@@ -75,14 +82,15 @@ void sdev_prefix_printk(const char *level, const struct scsi_device *sdev,
dev_printk(level, &sdev->sdev_gendev, "%s", logbuf);
scsi_log_release_buffer(logbuf);
}
-EXPORT_SYMBOL(sdev_prefix_printk);
+EXPORT_SYMBOL(_sdev_prefix_printk);
-void scmd_printk(const char *level, const struct scsi_cmnd *scmd,
- const char *fmt, ...)
+void _scmd_printk(const struct scsi_cmnd *scmd, const char *fmt, ...)
{
va_list args;
char *logbuf;
size_t off = 0, logbuf_len;
+ char level[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0";
+ size_t size;
if (!scmd || !scmd->cmnd)
return;
@@ -90,6 +98,12 @@ void scmd_printk(const char *level, const struct scsi_cmnd *scmd,
logbuf = scsi_log_reserve_buffer(&logbuf_len);
if (!logbuf)
return;
+
+ size = printk_skip_level(fmt) - fmt;
+ memcpy(level, fmt, size);
+ level[size] = '\0';
+ fmt += size;
+
off = sdev_format_header(logbuf, logbuf_len, scmd_name(scmd),
scmd->request->tag);
if (off < logbuf_len) {
@@ -100,7 +114,7 @@ void scmd_printk(const char *level, const struct scsi_cmnd *scmd,
dev_printk(level, &scmd->device->sdev_gendev, "%s", logbuf);
scsi_log_release_buffer(logbuf);
}
-EXPORT_SYMBOL(scmd_printk);
+EXPORT_SYMBOL(_scmd_printk);
static size_t scsi_format_opcode_name(char *buffer, size_t buf_len,
const unsigned char *cdbp)
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 1a5c9a3df6d6..002c723b65fa 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -252,19 +252,23 @@ struct scsi_device {
/*
* like scmd_printk, but the device name is passed in
- * as a string pointer
+ * as a string pointer in prefix
*/
-__printf(4, 5) void
-sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
- const char *, ...);
+__printf(3, 4)
+void _sdev_prefix_printk(const struct scsi_device *sdev,
+ const char *prefix, const char *fmt, ...);
+#define sdev_prefix_printk(level, sdev, prefix, fmt, ...) \
+ _sdev_prefix_printk(sdev, prefix, level fmt, ##__VA_ARGS__)
#define sdev_printk(l, sdev, fmt, a...) \
sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
-__printf(3, 4) void
-scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
+__printf(2, 3)
+void _scmd_printk(const struct scsi_cmnd *scmd, const char *fmt, ...);
+#define scmd_printk(level, scmd, fmt, ...) \
+ _scmd_printk(scmd, level fmt, ##__VA_ARGS__)
-#define scmd_dbg(scmd, fmt, a...) \
+#define scmd_dbg(scmd, fmt, a...) \
do { \
if ((scmd)->request->rq_disk) \
sdev_dbg((scmd)->device, "[%s] " fmt, \
--
2.26.0
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