forked from Minki/linux
874f9c7da9
Using functions instead of macros can reduce overall code size by
eliminating unnecessary "KERN_SOH<digit>" prefixes from format strings.
defconfig x86-64:
$ size vmlinux*
text data bss dec hex filename
10193570 4331464 1105920 15630954 ee826a vmlinux.new
10192623 4335560 1105920 15634103 ee8eb7 vmlinux.old
As the return value are unimportant and unused in the kernel tree, these
new functions return void.
Miscellanea:
- change pr_<level> macros to call new __pr_<level> functions
- change vprintk_nmi and vprintk_default to add LOGLEVEL_<level> argument
[akpm@linux-foundation.org: fix LOGLEVEL_INFO, per Joe]
Link: http://lkml.kernel.org/r/e16cc34479dfefcae37c98b481e6646f0f69efc3.1466718827.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/*
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* internal.h - printk internal definitions
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/percpu.h>
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typedef __printf(2, 0) int (*printk_func_t)(int level, const char *fmt,
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va_list args);
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__printf(2, 0)
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int vprintk_default(int level, const char *fmt, va_list args);
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#ifdef CONFIG_PRINTK_NMI
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extern raw_spinlock_t logbuf_lock;
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/*
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* printk() could not take logbuf_lock in NMI context. Instead,
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* it temporary stores the strings into a per-CPU buffer.
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* The alternative implementation is chosen transparently
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* via per-CPU variable.
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*/
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DECLARE_PER_CPU(printk_func_t, printk_func);
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__printf(2, 0)
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static inline int vprintk_func(int level, const char *fmt, va_list args)
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{
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return this_cpu_read(printk_func)(level, fmt, args);
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}
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extern atomic_t nmi_message_lost;
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static inline int get_nmi_message_lost(void)
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{
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return atomic_xchg(&nmi_message_lost, 0);
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}
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#else /* CONFIG_PRINTK_NMI */
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__printf(2, 0)
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static inline int vprintk_func(int level, const char *fmt, va_list args)
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{
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return vprintk_default(level, fmt, args);
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}
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static inline int get_nmi_message_lost(void)
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{
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return 0;
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}
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#endif /* CONFIG_PRINTK_NMI */
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