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From:   Matt Helsley <mhelsley@vmware.com>
To:     LKML <linux-kernel@vger.kernel.org>
CC:     Ingo Molnar <mingo@kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Matt Helsley <mhelsley@vmware.com>
Subject: [PATCH v4 7/8] recordmcount: Remove redundant cleanup() calls
Date:   Wed, 31 Jul 2019 11:24:15 -0700
Message-ID: <de197e17fc5426623a847ea7cf3a1560a7402a4b.1564596289.git.mhelsley@vmware.com>
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Redundant cleanup calls were introduced when transitioning from
the old error/success handling via setjmp/longjmp -- the longjmp
ensured the cleanup() call only happened once but replacing
the success_file()/fail_file() calls with cleanup() meant that
multiple cleanup() calls can happen as we return from function
calls.

In do_file(), looking just before and after the "goto out" jumps we
can see that multiple cleanups() are being performed. We remove
cleanup() calls from the nested functions because it makes the code
easier to review -- the resources being cleaned up are generally
allocated and initialized in the callers so freeing them there
makes more sense.

Other redundant cleanup() calls:

mmap_file() is only called from do_file() and, if mmap_file() fails,
then we goto out and do cleanup() there too.

write_file() is only called from do_file() and do_file()
calls cleanup() unconditionally after returning from write_file()
therefore the cleanup() calls in write_file() are not necessary.

find_secsym_ndx(), called from do_func()'s for-loop, when we are
cleaning up here it's obvious that we break out of the loop and
do another cleanup().

__has_rel_mcount() is called from two parts of do_func()
and calls cleanup(). In theory we move them into do_func(), however
these in turn prove redundant so another simplification step
removes them as well.

Signed-off-by: Matt Helsley <mhelsley@vmware.com>
---
 scripts/recordmcount.c | 13 -------------
 scripts/recordmcount.h |  2 --
 2 files changed, 15 deletions(-)

diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c
index 273ca8b42b20..5677fcc88a72 100644
--- a/scripts/recordmcount.c
+++ b/scripts/recordmcount.c
@@ -258,17 +258,14 @@ static void *mmap_file(char const *fname)
 	fd_map = open(fname, O_RDONLY);
 	if (fd_map < 0) {
 		perror(fname);
-		cleanup();
 		return NULL;
 	}
 	if (fstat(fd_map, &sb) < 0) {
 		perror(fname);
-		cleanup();
 		goto out;
 	}
 	if (!S_ISREG(sb.st_mode)) {
 		fprintf(stderr, "not a regular file: %s\n", fname);
-		cleanup();
 		goto out;
 	}
 	file_map = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE,
@@ -314,13 +311,11 @@ static int write_file(const char *fname)
 	fd_map = open(tmp_file, O_WRONLY | O_TRUNC | O_CREAT, sb.st_mode);
 	if (fd_map < 0) {
 		perror(fname);
-		cleanup();
 		return -1;
 	}
 	n = write(fd_map, file_map, sb.st_size);
 	if (n != sb.st_size) {
 		perror("write");
-		cleanup();
 		close(fd_map);
 		return -1;
 	}
@@ -328,7 +323,6 @@ static int write_file(const char *fname)
 		n = write(fd_map, file_append, file_append_size);
 		if (n != file_append_size) {
 			perror("write");
-			cleanup();
 			close(fd_map);
 			return -1;
 		}
@@ -336,7 +330,6 @@ static int write_file(const char *fname)
 	close(fd_map);
 	if (rename(tmp_file, fname) < 0) {
 		perror(fname);
-		cleanup();
 		return -1;
 	}
 	return 0;
@@ -460,7 +453,6 @@ static int do_file(char const *const fname)
 	default:
 		fprintf(stderr, "unrecognized ELF data encoding %d: %s\n",
 			ehdr->e_ident[EI_DATA], fname);
-		cleanup();
 		goto out;
 	case ELFDATA2LSB:
 		if (*(unsigned char const *)&endian != 1) {
@@ -493,7 +485,6 @@ static int do_file(char const *const fname)
 	    w2(ehdr->e_type) != ET_REL ||
 	    ehdr->e_ident[EI_VERSION] != EV_CURRENT) {
 		fprintf(stderr, "unrecognized ET_REL file %s\n", fname);
-		cleanup();
 		goto out;
 	}
 
@@ -502,7 +493,6 @@ static int do_file(char const *const fname)
 	default:
 		fprintf(stderr, "unrecognized e_machine %u %s\n",
 			w2(ehdr->e_machine), fname);
-		cleanup();
 		goto out;
 	case EM_386:
 		reltype = R_386_32;
@@ -546,14 +536,12 @@ static int do_file(char const *const fname)
 	default:
 		fprintf(stderr, "unrecognized ELF class %d %s\n",
 			ehdr->e_ident[EI_CLASS], fname);
-		cleanup();
 		goto out;
 	case ELFCLASS32:
 		if (w2(ehdr->e_ehsize) != sizeof(Elf32_Ehdr)
 		||  w2(ehdr->e_shentsize) != sizeof(Elf32_Shdr)) {
 			fprintf(stderr,
 				"unrecognized ET_REL file: %s\n", fname);
-			cleanup();
 			goto out;
 		}
 		if (w2(ehdr->e_machine) == EM_MIPS) {
@@ -569,7 +557,6 @@ static int do_file(char const *const fname)
 		||  w2(ghdr->e_shentsize) != sizeof(Elf64_Shdr)) {
 			fprintf(stderr,
 				"unrecognized ET_REL file: %s\n", fname);
-			cleanup();
 			goto out;
 		}
 		if (w2(ghdr->e_machine) == EM_S390) {
diff --git a/scripts/recordmcount.h b/scripts/recordmcount.h
index ca9aaac89bfb..8f0a278ce0af 100644
--- a/scripts/recordmcount.h
+++ b/scripts/recordmcount.h
@@ -463,7 +463,6 @@ static int find_secsym_ndx(unsigned const txtndx,
 	}
 	fprintf(stderr, "Cannot find symbol for section %u: %s.\n",
 		txtndx, txtname);
-	cleanup();
 	return -1;
 }
 
@@ -480,7 +479,6 @@ static char const * __has_rel_mcount(Elf_Shdr const *const relhdr, /* reltype */
 	if (strcmp("__mcount_loc", txtname) == 0) {
 		fprintf(stderr, "warning: __mcount_loc already exists: %s\n",
 			fname);
-		cleanup();
 		return already_has_rel_mcount;
 	}
 	if (w(txthdr->sh_type) != SHT_PROGBITS ||
-- 
2.20.1