--- a/init/Kconfig
+++ b/init/Kconfig

@@ -866,6 +866,28 @@ config LOG_CPU_MAX_BUF_SHIFT
                     13 =>   8 KB for each CPU
                     12 =>   4 KB for each CPU

+config NMI_LOG_BUF_SHIFT
+       int "Temporary per-CPU NMI log buffer size (12 => 4KB, 13 => 8KB)"
+       range 10 21
+       default 13
+       depends on PRINTK && HAVE_NMI

+       help
+         Select the size of a per-CPU buffer where NMI messages are temporary
+         stored. They are copied to the main log buffer in a safe context
+         to avoid a deadlock. The value defines the size as a power of 2.
+
+         NMI messages are rare and limited. The largest one is when
+         a backtrace is printed. It usually fits into 4KB. Select
+         8KB if you want to be on the safe side.
+
+         Examples:
+                    17 => 128 KB for each CPU
+                    16 =>  64 KB for each CPU
+                    15 =>  32 KB for each CPU
+                    14 =>  16 KB for each CPU
+                    13 =>   8 KB for each CPU
+                    12 =>   4 KB for each CPU
+
 #
 # Architectures with an unreliable sched_clock() should select this:
 #

diff --git a/kernel/printk/nmi.c b/kernel/printk/nmi.c
index 5465230b75ec..78c07d441b4e 100644
--- a/kernel/printk/nmi.c
+++ b/kernel/printk/nmi.c

@@ -41,7 +41,8 @@ DEFINE_PER_CPU(printk_func_t, printk_func) = vprintk_default;
 static int printk_nmi_irq_ready;
 atomic_t nmi_message_lost;

-#define NMI_LOG_BUF_LEN (4096 - sizeof(atomic_t) - sizeof(struct irq_work))
+#define NMI_LOG_BUF_LEN ((1 << CONFIG_NMI_LOG_BUF_SHIFT) -             \
+                        sizeof(atomic_t) - sizeof(struct irq_work))