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-rw-r--r--init/Kconfig1
-rw-r--r--kernel/printk/printk.c7
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)
{