um: Enable preemption in UML

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Since userspace state is saved in the MM process, kernel using
FPU still doesn't really need to do anything, so this really
is as simple as enabling preemption. The irq critical section
in sigio_handler() needs preempt_disable()/preempt_enable().

Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Link: https://patch.msgid.link/20240702102549.d2fcea450854.I12f5a53d80ec1e425e66ef272b1e95cb523b608e@changeid
[rebase, remove FPU save/restore, fix x86/um Makefile,
 rewrite commit message]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

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Anton Ivanov 2024-07-02 10:25:50 +02:00 • committed by Johannes Berg

parent bcf3d957c6

commit cd01672d64

3 changed files with 3 additions and 2 deletions

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2

arch/um/Kconfig

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2

arch/um/kernel/irq.c

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1

arch/x86/um/Makefile

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