linux-kernel - [PATCH 4.18 095/171] x86/cpu/vmware: Do not trace vmware_sched

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Message-Id: <20181119162634.211879353@linuxfoundation.org>
Date:   Mon, 19 Nov 2018 17:28:11 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, GwanYeong Kim <gy741.kim@...il.com>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Borislav Petkov <bp@...e.de>,
        Alok Kataria <akataria@...are.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        virtualization@...ts.linux-foundation.org, x86-ml <x86@...nel.org>
Subject: [PATCH 4.18 095/171] x86/cpu/vmware: Do not trace vmware_sched_clock()

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Steven Rostedt (VMware) <rostedt@...dmis.org>

commit 15035388439f892017d38b05214d3cda6578af64 upstream.

When running function tracing on a Linux guest running on VMware
Workstation, the guest would crash. This is due to tracing of the
sched_clock internal call of the VMware vmware_sched_clock(), which
causes an infinite recursion within the tracing code (clock calls must
not be traced).

Make vmware_sched_clock() not traced by ftrace.

Fixes: 80e9a4f21fd7c ("x86/vmware: Add paravirt sched clock")
Reported-by: GwanYeong Kim <gy741.kim@...il.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Signed-off-by: Borislav Petkov <bp@...e.de>
CC: Alok Kataria <akataria@...are.com>
CC: GwanYeong Kim <gy741.kim@...il.com>
CC: "H. Peter Anvin" <hpa@...or.com>
CC: Ingo Molnar <mingo@...nel.org>
Cc: stable@...r.kernel.org
CC: Thomas Gleixner <tglx@...utronix.de>
CC: virtualization@...ts.linux-foundation.org
CC: x86-ml <x86@...nel.org>
Link: http://lkml.kernel.org/r/20181109152207.4d3e7d70@gandalf.local.home
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/kernel/cpu/vmware.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -77,7 +77,7 @@ static __init int setup_vmw_sched_clock(
 }
 early_param("no-vmw-sched-clock", setup_vmw_sched_clock);

-static unsigned long long vmware_sched_clock(void)
+static unsigned long long notrace vmware_sched_clock(void)
 {
 	unsigned long long ns;