linux-kernel - [PATCH 02/19] objtool: Add fallback from ELF_C_READ_MMAP to ELF_C

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Date:	Wed, 13 Jul 2016 23:20:38 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: [PATCH 02/19] objtool: Add fallback from ELF_C_READ_MMAP to ELF_C_READ

From: Arnaldo Carvalho de Melo <acme@...hat.com>

Not all libelf implementations have this "Please, ELF_C_READ, but use
mmap if possible" elf_begin() cmd, so provide a fallback to plain old
ELF_C_READ.

Case in point: Alpine Linux 3.4.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/n/tip-1fctuknrawgoi5xqon4mu9dv@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/objtool/elf.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index e11f6b69cce6..0d7983ac63ef 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -30,6 +30,13 @@
 #include "elf.h"
 #include "warn.h"
 
+/*
+ * Fallback for systems without this "read, mmaping if possible" cmd.
+ */
+#ifndef ELF_C_READ_MMAP
+#define ELF_C_READ_MMAP ELF_C_READ
+#endif
+
 struct section *find_section_by_name(struct elf *elf, const char *name)
 {
 	struct section *sec;
-- 
2.7.4