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tracing: Have stack tracer compile when MCOUNT_INSN_SIZE is not defined 

commit b8299d362d0837ae39e87e9019ebe6b736e0f035 upstream.

On some archs with some configurations, MCOUNT_INSN_SIZE is not defined, and
this makes the stack tracer fail to compile. Just define it to zero in this
case.

Link: https://lore.kernel.org/r/202001020219.zvE3vsty%lkp@intel.com

Cc: stable@vger.kernel.org
Fixes: 4df297129f ("tracing: Remove most or all of stack tracer stack size from stack_max_size")
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Steven Rostedt (VMware) 2020-01-02 22:02:41 -05:00 committed by Greg Kroah-Hartman
parent 654eced27a
commit 907062a750
1 changed files with 5 additions and 0 deletions
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5
kernel/trace/trace_stack.c
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@ -283,6 +283,11 @@ static void check_stack(unsigned long ip, unsigned long *stack)
local_irq_restore(flags);
}
/* Some archs may not define MCOUNT_INSN_SIZE */
#ifndef MCOUNT_INSN_SIZE
# define MCOUNT_INSN_SIZE 0
#endif
static void
stack_trace_call(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct pt_regs *pt_regs)