linux-kernel - [tip: objtool/urgent] x86/xen: Fix noinstr fail in xen_pv_evtchn_do

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Date:   Tue, 22 Jun 2021 12:03:39 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: objtool/urgent] x86/xen: Fix noinstr fail in xen_pv_evtchn_do_upcall()

The following commit has been merged into the objtool/urgent branch of tip:

Commit-ID:     84e60065df9ef03759115a7e48c04bbc0d292165
Gitweb:        https://git.kernel.org/tip/84e60065df9ef03759115a7e48c04bbc0d292165
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Mon, 21 Jun 2021 13:12:35 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 22 Jun 2021 13:56:42 +02:00

x86/xen: Fix noinstr fail in xen_pv_evtchn_do_upcall()

Fix:

  vmlinux.o: warning: objtool: xen_pv_evtchn_do_upcall()+0x23: call to irq_enter_rcu() leaves .noinstr.text section

Fixes: 359f01d1816f ("x86/entry: Use run_sysvec_on_irqstack_cond() for XEN upcall")
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lore.kernel.org/r/20210621120120.532960208@infradead.org
---
 arch/x86/entry/common.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index a6bf516..04bce95 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -269,15 +269,16 @@ __visible noinstr void xen_pv_evtchn_do_upcall(struct pt_regs *regs)
 	irqentry_state_t state = irqentry_enter(regs);
 	bool inhcall;
 
+	instrumentation_begin();
 	run_sysvec_on_irqstack_cond(__xen_pv_evtchn_do_upcall, regs);
 
 	inhcall = get_and_clear_inhcall();
 	if (inhcall && !WARN_ON_ONCE(state.exit_rcu)) {
-		instrumentation_begin();
 		irqentry_exit_cond_resched();
 		instrumentation_end();
 		restore_inhcall(inhcall);
 	} else {
+		instrumentation_end();
 		irqentry_exit(regs, state);
 	}
 }