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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-10-27 11:09:51 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-11-11 14:35:16 +0100 |
| commit | cba08c5dc6dc1a906a0b5ddac9a9ac6c9a64f2e8 (patch) | |
| tree | 7ce4592cb4d33bfdf4d19169be49bddbf153c9d2 /arch/x86/kernel/signal.c | |
| parent | 5f0c71278d6848b4809f83af90f28196e1505ab1 (diff) | |
| download | linux-cba08c5dc6dc1a906a0b5ddac9a9ac6c9a64f2e8.tar.bz2 | |
x86/fpu: Make kernel FPU protection RT friendly
Non RT kernels need to protect FPU against preemption and bottom half
processing. This is achieved by disabling bottom halfs via
local_bh_disable() which implictly disables preemption.
On RT kernels this protection mechanism is not sufficient because
local_bh_disable() does not disable preemption. It serializes bottom half
related processing via a CPU local lock.
As bottom halfs are running always in thread context on RT kernels
disabling preemption is the proper choice as it implicitly prevents bottom
half processing.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201027101349.588965083@linutronix.de
Diffstat (limited to 'arch/x86/kernel/signal.c')
0 files changed, 0 insertions, 0 deletions