diff options
| author | Max Filippov <jcmvbkbc@gmail.com> | 2015-11-27 16:26:41 +0300 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2016-01-11 17:31:55 +0300 |
| commit | e462919413547dcfe84e785380d0f47f1359878a (patch) | |
| tree | 4c80bbd286f9c106d243149ec14634c2e9811a6f /arch/xtensa/Kconfig | |
| parent | afd2ff9b7e1b367172f18ba7f693dfb62bdcb2dc (diff) | |
xtensa: make fake NMI configurable
Do not always use fake NMI when safe, provide Kconfig option instead.
Print a warning if fake NMI is chosen in unsafe configuration, but allow
it, because it may work if the user knows that interrupts with
priorities at or above PMM IRQ are not used. Add a check to NMI handler
that BUGs if any of these IRQs fire.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/Kconfig')
| -rw-r--r-- | arch/xtensa/Kconfig | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index 82044f732323..128e63d3a632 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -139,6 +139,22 @@ config XTENSA_VARIANT_HAVE_PERF_EVENTS If unsure, say N. +config XTENSA_FAKE_NMI + bool "Treat PMM IRQ as NMI" + depends on XTENSA_VARIANT_HAVE_PERF_EVENTS + default n + help + If PMM IRQ is the only IRQ at EXCM level it is safe to + treat it as NMI, which improves accuracy of profiling. + + If there are other interrupts at or above PMM IRQ priority level + but not above the EXCM level, PMM IRQ still may be treated as NMI, + but only if these IRQs are not used. There will be a build warning + saying that this is not safe, and a bugcheck if one of these IRQs + actually fire. + + If unsure, say N. + config XTENSA_UNALIGNED_USER bool "Unaligned memory access in use space" help |