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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:06:00 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:06:00 +0000 |
commit | b15a952c52a6825376d3e7f6c1bf5c886c6d8b74 (patch) | |
tree | 1500f2f8f276908a36d8126cb632c0d6b1276764 /debian/patches-rt/0192-efi-Disable-runtime-services-on-RT.patch | |
parent | Adding upstream version 5.10.209. (diff) | |
download | linux-debian.tar.xz linux-debian.zip |
Adding debian version 5.10.209-2.debian/5.10.209-2debian
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'debian/patches-rt/0192-efi-Disable-runtime-services-on-RT.patch')
-rw-r--r-- | debian/patches-rt/0192-efi-Disable-runtime-services-on-RT.patch | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/debian/patches-rt/0192-efi-Disable-runtime-services-on-RT.patch b/debian/patches-rt/0192-efi-Disable-runtime-services-on-RT.patch new file mode 100644 index 000000000..ed06b5934 --- /dev/null +++ b/debian/patches-rt/0192-efi-Disable-runtime-services-on-RT.patch @@ -0,0 +1,46 @@ +From 6c6afc933fea370e5c90a34ed6b622bcc274af5a Mon Sep 17 00:00:00 2001 +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Thu, 26 Jul 2018 15:03:16 +0200 +Subject: [PATCH 192/323] efi: Disable runtime services on RT +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz + +Based on meassurements the EFI functions get_variable / +get_next_variable take up to 2us which looks okay. +The functions get_time, set_time take around 10ms. Those 10ms are too +much. Even one ms would be too much. +Ard mentioned that SetVariable might even trigger larger latencies if +the firware will erase flash blocks on NOR. + +The time-functions are used by efi-rtc and can be triggered during +runtimed (either via explicit read/write or ntp sync). + +The variable write could be used by pstore. +These functions can be disabled without much of a loss. The poweroff / +reboot hooks may be provided by PSCI. + +Disable EFI's runtime wrappers. + +This was observed on "EFI v2.60 by SoftIron Overdrive 1000". + +Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + drivers/firmware/efi/efi.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c +index 332739f3eded..8d390091203f 100644 +--- a/drivers/firmware/efi/efi.c ++++ b/drivers/firmware/efi/efi.c +@@ -66,7 +66,7 @@ struct mm_struct efi_mm = { + + struct workqueue_struct *efi_rts_wq; + +-static bool disable_runtime; ++static bool disable_runtime = IS_ENABLED(CONFIG_PREEMPT_RT); + static int __init setup_noefi(char *arg) + { + disable_runtime = true; +-- +2.43.0 + |