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The UEFI spec allows Runtime Services to be invoked with interrupts enabled. The only reason we were disabling interrupts was to prevent recursive calls into the services on the same CPU, which will lead to deadlock. However, the only context where such invocations may occur legally is from efi-pstore via efivars, and that code has been updated to call a non-blocking alternative when invoked from a non-interruptible context. So instead, update the ordinary, blocking UEFI Runtime Services wrappers to execute with interrupts enabled. This aims to prevent excessive interrupt latencies on uniprocessor platforms with slow variable stores. Note that other OSes such as Windows call UEFI Runtime Services with interrupts enabled as well. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/1455712566-16727-3-git-send-email-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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| .. | ||
| libstub | ||
| arm-init.c | ||
| arm-runtime.c | ||
| cper.c | ||
| efi-pstore.c | ||
| efi.c | ||
| efivars.c | ||
| esrt.c | ||
| fake_mem.c | ||
| Kconfig | ||
| Makefile | ||
| reboot.c | ||
| runtime-map.c | ||
| runtime-wrappers.c | ||
| vars.c | ||