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printk: allocate kernel log buffer earlier

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On larger systems, because of the numerous ACPI, Bootmem and EFI messages,
the static log buffer overflows before the larger one specified by the
log_buf_len param is allocated.  Minimize the overflow by allocating the
new log buffer as soon as possible.

On kernels without memblock, a later call to setup_log_buf from
kernel/init.c is the fallback.

[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: fix CONFIG_PRINTK=n build]
Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Travis
2011-05-24 17:13:20 -07:00
committed by Linus Torvalds
parent 95dde50190
commit 162a7e7500
4 changed files with 70 additions and 31 deletions
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7
include/linux/printk.h
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@@ -1,6 +1,8 @@
#ifndef __KERNEL_PRINTK__
#define __KERNEL_PRINTK__
#include <linux/init.h>
extern const char linux_banner[];
extern const char linux_proc_banner[];
@@ -113,6 +115,7 @@ extern int dmesg_restrict;
extern int kptr_restrict;
void log_buf_kexec_setup(void);
void __init setup_log_buf(int early);
#else
static inline __attribute__ ((format (printf, 1, 0)))
int vprintk(const char *s, va_list args)
@@ -137,6 +140,10 @@ static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
static inline void log_buf_kexec_setup(void)
{
}
static inline void setup_log_buf(int early)
{
}
#endif
extern void dump_stack(void) __cold;