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Merge branch 'v5.19/standard/base' into v5.19/standard/mti-malta32

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This commit is contained in:
Bruce Ashfield 2023-01-01 21:58:01 -05:00
commit ceaf213463
1 changed files with 11 additions and 1 deletions
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12
arch/powerpc/lib/vmx-helper.c
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@ -36,7 +36,17 @@ int exit_vmx_usercopy(void)
{
disable_kernel_altivec();
pagefault_enable();
preempt_enable();
preempt_enable_no_resched();
/*
* Must never explicitly call schedule (including preempt_enable())
* while in a kuap-unlocked user copy, because the AMR register will
* not be saved and restored across context switch. However preempt
* kernels need to be preempted as soon as possible if need_resched is
* set and we are preemptible. The hack here is to schedule a
* decrementer to fire here and reschedule for us if necessary.
*/
if (IS_ENABLED(CONFIG_PREEMPT) && need_resched())
set_dec(1);
return 0;
}