From b5efec00b671c5d7e9cb9e73a1d4925dd6ce8dcd Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Fri, 12 Mar 2021 12:50:47 +0000 Subject: powerpc/32s: Move KUEP locking/unlocking in C 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 Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/4eadd873927e9a73c3d1dfe2f9497353465514cf.1615552867.git.christophe.leroy@csgroup.eu --- arch/powerpc/kernel/interrupt.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/powerpc/kernel/interrupt.c') diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c index 6875b82f613a..20ace874cd98 100644 --- a/arch/powerpc/kernel/interrupt.c +++ b/arch/powerpc/kernel/interrupt.c @@ -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; } -- cgit v1.2.3