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powerpc/32s: Move KUEP locking/unlocking in C

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This can be done in C, do it.

Unrolling the loop gains approx. 15% performance.

From now on, prepare_transfer_to_handler() is only for
interrupts from kernel.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/4eadd873927e9a73c3d1dfe2f9497353465514cf.1615552867.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-03-12 12:50:47 +00:00 • committed by Michael Ellerman
parent a2b3e09ae4
commit b5efec00b6
9 changed files with 64 additions and 48 deletions
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4
arch/powerpc/kernel/interrupt.c
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@ -33,6 +33,8 @@ notrace long system_call_exception(long r3, long r4, long r5,
{
syscall_fn f;
kuep_lock();
regs->orig_gpr3 = r3;
if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
@ -354,6 +356,8 @@ again:
*/
kuap_user_restore(regs);
#endif
kuep_unlock();
return ret;
}