diff options
| author | Geert Uytterhoeven <geert@linux-m68k.org> | 2014-10-14 02:51:11 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-14 04:18:12 +0400 |
| commit | 2240a31db67582468e2f7a5a5962b7d0ffaaa6a4 (patch) | |
| tree | 5a061c2ca769ba610df8471b08ee4d6b7f0cf02f | |
| parent | de9e14eebf33a60712a52a0bc6e08c043c0aba53 (diff) | |
| download | linux-2240a31db67582468e2f7a5a5962b7d0ffaaa6a4.tar.xz | |
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>
| -rw-r--r-- | init/Kconfig | 1 | ||||
| -rw-r--r-- | kernel/printk/printk.c | 7 |
2 files changed, 7 insertions, 1 deletions
diff --git a/init/Kconfig b/init/Kconfig index 1c505e090422..3ee28ae02cc8 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -838,6 +838,7 @@ config LOG_BUF_SHIFT config LOG_CPU_MAX_BUF_SHIFT int "CPU kernel log buffer size contribution (13 => 8 KB, 17 => 128KB)" + depends on SMP range 0 21 default 12 if !BASE_SMALL default 0 if BASE_SMALL diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 7a6e69441f75..a4436b0cf769 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -267,7 +267,6 @@ static u32 clear_idx; #define LOG_ALIGN __alignof__(struct printk_log) #endif #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; 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); +#ifdef CONFIG_SMP +#define __LOG_CPU_MAX_BUF_LEN (1 << CONFIG_LOG_CPU_MAX_BUF_SHIFT) + static void __init log_buf_add_cpu(void) { 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); } +#else /* !CONFIG_SMP */ +static inline void log_buf_add_cpu(void) {} +#endif /* CONFIG_SMP */ void __init setup_log_buf(int early) { |