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Subject[PATCH 5.12 016/110] x86/xen: Fix noinstr fail in xen_pv_evtchn_do_upcall()
Date
From: Peter Zijlstra <peterz@infradead.org>

[ Upstream commit 84e60065df9ef03759115a7e48c04bbc0d292165 ]

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@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210621120120.532960208@infradead.org
Signed-off-by: Sasha Levin <sashal@kernel.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 cbe19c87e6be..8767dc53b569 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -266,15 +266,16 @@ __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);
}
}
--
2.30.2
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