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Diffstat (limited to 'init/Kconfig')
| -rw-r--r-- | init/Kconfig | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index 79a91a2c0444..a9c4aefd5436 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -862,6 +862,28 @@ 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_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: # @@ -1454,6 +1476,11 @@ config PRINTK very difficult to diagnose system problems, saying N here is strongly discouraged. +config PRINTK_NMI + def_bool y + depends on PRINTK + depends on HAVE_NMI + config BUG bool "BUG() support" if EXPERT default y |