Commit-ID: 15035388439f892017d38b05214d3cda6578af64
Gitweb: https://git.kernel.org/tip/15035388439f892017d38b05214d3cda6578af64
Author: Steven Rostedt (VMware) <rost...@goodmis.org>
AuthorDate: Fri, 9 Nov 2018 15:22:07 -0500
Committer: Borislav Petkov <b...@suse.de>
CommitDate: Fri, 9 Nov 2018 21:39:14 +0100
x86/cpu/vmware: Do not trace vmware_sched_clock()
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....@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rost...@goodmis.org>
Signed-off-by: Borislav Petkov <b...@suse.de>
CC: Alok Kataria <akata...@vmware.com>
CC: GwanYeong Kim <gy741....@gmail.com>
CC: "H. Peter Anvin" <h...@zytor.com>
CC: Ingo Molnar <mi...@kernel.org>
Cc: sta...@vger.kernel.org
CC: Thomas Gleixner <t...@linutronix.de>
CC: virtualizat...@lists.linux-foundation.org
CC: x86-ml <x...@kernel.org>
Link: http://lkml.kernel.org/r/20181109152207.4d3e7...@gandalf.local.home
---
arch/x86/kernel/cpu/vmware.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index d9ab49bed8af..0eda91f8eeac 100644
--- 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(char *s)
}
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;
