Revert "perf tests: Decompress kernel module before objdump"

This reverts commit 7525a23 which is
commit 94df104 upstream.

It breaks the build of perf on 4.9.y, so I'm dropping it.

Reported-by: Pavlos Parissis <[email protected]>
Reported-by: Lei Chen <[email protected]>
Reported-by: Maxime Hadjinlian <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Wang Nan <[email protected]>
Cc: [email protected]
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Sasha Levin <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: gregkh

tools/perf/tests/code-reading.c

@@ -224,8 +224,6 @@ static int read_object_code(u64 addr, size_t len, u8 cpumode,
 	unsigned char buf2[BUFSZ];
 	size_t ret_len;
 	u64 objdump_addr;
-	const char *objdump_name;
-	char decomp_name[KMOD_DECOMP_LEN];
 	int ret;
 
 	pr_debug("Reading object code for memory address: %#"PRIx64"\n", addr);
@@ -286,25 +284,9 @@ static int read_object_code(u64 addr, size_t len, u8 cpumode,
 		state->done[state->done_cnt++] = al.map->start;
 	}
 
-	objdump_name = al.map->dso->long_name;
-	if (dso__needs_decompress(al.map->dso)) {
-		if (dso__decompress_kmodule_path(al.map->dso, objdump_name,
-						 decomp_name,
-						 sizeof(decomp_name)) < 0) {
-			pr_debug("decompression failed\n");
-			return -1;
-		}
-
-		objdump_name = decomp_name;
-	}
-
 	/* Read the object code using objdump */
 	objdump_addr = map__rip_2objdump(al.map, al.addr);
-	ret = read_via_objdump(objdump_name, objdump_addr, buf2, len);
-
-	if (dso__needs_decompress(al.map->dso))
-		unlink(objdump_name);
-
+	ret = read_via_objdump(al.map->dso->long_name, objdump_addr, buf2, len);
 	if (ret > 0) {
 		/*
 		 * The kernel maps are inaccurate - assume objdump is right in