x86/fpu: Do not inherit FPU context for kernel and IO worker threads

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There is no reason why kernel and IO worker threads need a full clone of
the parent's FPU state. Both are kernel threads which are not supposed to
use FPU. So copying a large state or doing XSAVE() is pointless. Just clean
out the minimally required state for those tasks.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211015011538.839822981@linutronix.de

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Thomas Gleixner 2021-10-15 03:16:06 +02:00 • committed by Borislav Petkov

parent 2d16a1876f

commit 509e7a30cd

1 changed files with 26 additions and 11 deletions

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arch/x86/kernel/fpu/core.c

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