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printk: don't bother using LOG_CPU_MAX_BUF_SHIFT on !SMP 

When configuring a uniprocessor kernel, don't bother the user with an
irrelevant LOG_CPU_MAX_BUF_SHIFT question, and don't build the unused
code.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Luis R. Rodriguez <mcgrof@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Geert Uytterhoeven 2014-10-13 15:51:11 -07:00 committed by Linus Torvalds
parent de9e14eebf
commit 2240a31db6
2 changed files with 7 additions and 1 deletions
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1
init/Kconfig
View File

@ -838,6 +838,7 @@ config LOG_BUF_SHIFT
config LOG_CPU_MAX_BUF_SHIFT config LOG_CPU_MAX_BUF_SHIFT
int "CPU kernel log buffer size contribution (13 => 8 KB, 17 => 128KB)" int "CPU kernel log buffer size contribution (13 => 8 KB, 17 => 128KB)"
depends on SMP
range 0 21 range 0 21
default 12 if !BASE_SMALL default 12 if !BASE_SMALL
default 0 if BASE_SMALL default 0 if BASE_SMALL

7
kernel/printk/printk.c
View File

@ -267,7 +267,6 @@ static u32 clear_idx;
#define LOG_ALIGN __alignof__(struct printk_log) #define LOG_ALIGN __alignof__(struct printk_log)
#endif #endif
#define __LOG_BUF_LEN (1 << CONFIG_LOG_BUF_SHIFT) #define __LOG_BUF_LEN (1 << CONFIG_LOG_BUF_SHIFT)
#define __LOG_CPU_MAX_BUF_LEN (1 << CONFIG_LOG_CPU_MAX_BUF_SHIFT)
static char __log_buf[__LOG_BUF_LEN] __aligned(LOG_ALIGN); static char __log_buf[__LOG_BUF_LEN] __aligned(LOG_ALIGN);
static char *log_buf = __log_buf; static char *log_buf = __log_buf;
static u32 log_buf_len = __LOG_BUF_LEN; static u32 log_buf_len = __LOG_BUF_LEN;
@ -852,6 +851,9 @@ static int __init log_buf_len_setup(char *str)
} }
early_param("log_buf_len", log_buf_len_setup); early_param("log_buf_len", log_buf_len_setup);
#ifdef CONFIG_SMP
#define __LOG_CPU_MAX_BUF_LEN (1 << CONFIG_LOG_CPU_MAX_BUF_SHIFT)
static void __init log_buf_add_cpu(void) static void __init log_buf_add_cpu(void)
{ {
unsigned int cpu_extra; unsigned int cpu_extra;
@ -878,6 +880,9 @@ static void __init log_buf_add_cpu(void)
log_buf_len_update(cpu_extra + __LOG_BUF_LEN); log_buf_len_update(cpu_extra + __LOG_BUF_LEN);
} }
#else /* !CONFIG_SMP */
static inline void log_buf_add_cpu(void) {}
#endif /* CONFIG_SMP */
void __init setup_log_buf(int early) void __init setup_log_buf(int early)
{ {