linux-kernel - [PATCH 4.9 37/49] tracing: Fix SKIP_STACK_VALIDATION=1 build due to bad merge with -mrecord-mcount

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Message-Id: <20210222121027.681852585@linuxfoundation.org>
Date:   Mon, 22 Feb 2021 13:36:35 +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, Andi Kleen <ak@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Greg Thelen <gthelen@...gle.com>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Subject: [PATCH 4.9 37/49] tracing: Fix SKIP_STACK_VALIDATION=1 build due to bad merge with -mrecord-mcount

From: Greg Thelen <gthelen@...gle.com>

commit ed7d40bc67b8353c677b38c6cdddcdc310c0f452 upstream.

Non gcc-5 builds with CONFIG_STACK_VALIDATION=y and
SKIP_STACK_VALIDATION=1 fail.
Example output:
  /bin/sh: init/.tmp_main.o: Permission denied

commit 96f60dfa5819 ("trace: Use -mcount-record for dynamic ftrace"),
added a mismatched endif.  This causes cmd_objtool to get mistakenly
set.

Relocate endif to balance the newly added -record-mcount check.

Link: http://lkml.kernel.org/r/20180608214746.136554-1-gthelen@google.com

Fixes: 96f60dfa5819 ("trace: Use -mcount-record for dynamic ftrace")
Acked-by: Andi Kleen <ak@...ux.intel.com>
Tested-by: David Rientjes <rientjes@...gle.com>
Signed-off-by: Greg Thelen <gthelen@...gle.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 scripts/Makefile.build |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -255,6 +255,7 @@ cmd_record_mcount =						\
 	     "$(CC_FLAGS_FTRACE)" ]; then			\
 		$(sub_cmd_record_mcount)			\
 	fi;
+endif # -record-mcount
 endif
 
 ifdef CONFIG_STACK_VALIDATION
@@ -269,7 +270,6 @@ endif
 ifdef CONFIG_GCOV_KERNEL
 objtool_args += --no-unreachable
 endif
-endif
 
 # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file