From eda86a41a1c7700757c9217f74b9d57431c3e5f4 Mon Sep 17 00:00:00 2001 From: Shrikanth Hegde Date: Sun, 17 Nov 2024 00:53:06 +0530 Subject: [PATCH] powerpc: Large user copy aware of full:rt:lazy preemption Large user copy_to/from (more than 16 bytes) uses vmx instructions to speed things up. Once the copy is done, it makes sense to try schedule as soon as possible for preemptible kernels. So do this for preempt=full/lazy and rt kernel. Not checking for lazy bit here, since it could lead to unnecessary context switches. Suggested-by: Sebastian Andrzej Siewior Signed-off-by: Shrikanth Hegde Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20241116192306.88217-3-sshegde@linux.ibm.com --- arch/powerpc/lib/vmx-helper.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/lib/vmx-helper.c b/arch/powerpc/lib/vmx-helper.c index d491da8d18389..58ed6bd613a6f 100644 --- a/arch/powerpc/lib/vmx-helper.c +++ b/arch/powerpc/lib/vmx-helper.c @@ -45,7 +45,7 @@ int exit_vmx_usercopy(void) * 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()) + if (IS_ENABLED(CONFIG_PREEMPTION) && need_resched()) set_dec(1); return 0; } -- 2.39.5