perf: Enable more compiler warnings

Related to a shadowed variable bug fix Valdis Kletnieks noticed
that perf does not get built with -Wshadow, which could have
helped us avoid the bug.

So enable -Wshadow and also enable the following warnings on
perf builds, in addition to the already enabled -Wall -Wextra
-std=gnu99 warnings:

 -Wcast-align
 -Wformat=2
 -Wshadow
 -Winit-self
 -Wpacked
 -Wredundant-decls
 -Wstack-protector
 -Wstrict-aliasing=3
 -Wswitch-default
 -Wswitch-enum
 -Wno-system-headers
 -Wundef
 -Wvolatile-register-var
 -Wwrite-strings
 -Wbad-function-cast
 -Wmissing-declarations
 -Wmissing-prototypes
 -Wnested-externs
 -Wold-style-definition
 -Wstrict-prototypes
 -Wdeclaration-after-statement

And change/fix the perf code to build cleanly under GCC 4.3.2.

The list of warnings enablement is rather arbitrary: it's based
on my (quick) reading of the GCC manpages and trying them on
perf.

I categorized the warnings based on individually enabling them
and looking whether they trigger something in the perf build.
If i liked those warnings (i.e. if they trigger for something
that arguably could be improved) i enabled the warning.

If the warnings seemed to come from language laywers spamming
the build with tons of nuisance warnings i generally kept them
off. Most of the sign conversion related warnings were in
this category. (A second patch enabling some of the sign
warnings might be welcome - sign bugs can be nasty.)

I also kept warnings that seem to make sense from their manpage
description and which produced no actual warnings on our code
base. These warnings might still be turned off if they end up
being a nuisance.

I also left out a few warnings that are not supported in older
compilers.

[ Note that these changes might break the build on older
  compilers i did not test, or on non-x86 architectures that
  produce different warnings, so more testing would be welcome. ]

Reported-by: Valdis.Kletnieks@vt.edu
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 52 insertions, 52 deletions

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 0b9862351260..3159d47ae1cc 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -21,7 +21,7 @@ enum dso_origin {
 
 static struct symbol *symbol__new(u64 start, u64 len,
 				  const char *name, unsigned int priv_size,
-				  u64 obj_start, int verbose)
+				  u64 obj_start, int v)
 {
 	size_t namelen = strlen(name) + 1;
 	struct symbol *self = calloc(1, priv_size + sizeof(*self) + namelen);
@@ -29,7 +29,7 @@ static struct symbol *symbol__new(u64 start, u64 len,
 	if (!self)
 		return NULL;
 
-	if (verbose >= 2)
+	if (v >= 2)
 		printf("new symbol: %016Lx [%08lx]: %s, hist: %p, obj_start: %p\n",
 			(u64)start, (unsigned long)len, name, self->hist, (void *)(unsigned long)obj_start);
 
@@ -156,7 +156,7 @@ size_t dso__fprintf(struct dso *self, FILE *fp)
 	return ret;
 }
 
-static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter, int verbose)
+static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter, int v)
 {
 	struct rb_node *nd, *prevnd;
 	char *line = NULL;
@@ -198,7 +198,7 @@ static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter, int verb
 		 * Well fix up the end later, when we have all sorted.
 		 */
 		sym = symbol__new(start, 0xdead, line + len + 2,
-				  self->sym_priv_size, 0, verbose);
+				  self->sym_priv_size, 0, v);
 
 		if (sym == NULL)
 			goto out_delete_line;
@@ -239,7 +239,7 @@ out_failure:
 	return -1;
 }
 
-static int dso__load_perf_map(struct dso *self, symbol_filter_t filter, int verbose)
+static int dso__load_perf_map(struct dso *self, symbol_filter_t filter, int v)
 {
 	char *line = NULL;
 	size_t n;
@@ -277,7 +277,7 @@ static int dso__load_perf_map(struct dso *self, symbol_filter_t filter, int verb
 			continue;
 
 		sym = symbol__new(start, size, line + len,
-				  self->sym_priv_size, start, verbose);
+				  self->sym_priv_size, start, v);
 
 		if (sym == NULL)
 			goto out_delete_line;
@@ -305,13 +305,13 @@ out_failure:
  * elf_symtab__for_each_symbol - iterate thru all the symbols
  *
  * @self: struct elf_symtab instance to iterate
- * @index: uint32_t index
+ * @idx: uint32_t idx
  * @sym: GElf_Sym iterator
  */
-#define elf_symtab__for_each_symbol(syms, nr_syms, index, sym) \
-	for (index = 0, gelf_getsym(syms, index, &sym);\
-	     index < nr_syms; \
-	     index++, gelf_getsym(syms, index, &sym))
+#define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
+	for (idx = 0, gelf_getsym(syms, idx, &sym);\
+	     idx < nr_syms; \
+	     idx++, gelf_getsym(syms, idx, &sym))
 
 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
 {
@@ -354,7 +354,7 @@ static inline const char *elf_sym__name(const GElf_Sym *sym,
 
 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
 				    GElf_Shdr *shp, const char *name,
-				    size_t *index)
+				    size_t *idx)
 {
 	Elf_Scn *sec = NULL;
 	size_t cnt = 1;
@@ -365,8 +365,8 @@ static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
 		gelf_getshdr(sec, shp);
 		str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
 		if (!strcmp(name, str)) {
-			if (index)
-				*index = cnt;
+			if (idx)
+				*idx = cnt;
 			break;
 		}
 		++cnt;
@@ -392,7 +392,7 @@ static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
  * And always look at the original dso, not at debuginfo packages, that
  * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
  */
-static int dso__synthesize_plt_symbols(struct  dso *self, int verbose)
+static int dso__synthesize_plt_symbols(struct  dso *self, int v)
 {
 	uint32_t nr_rel_entries, idx;
 	GElf_Sym sym;
@@ -442,7 +442,7 @@ static int dso__synthesize_plt_symbols(struct  dso *self, int verbose)
 		goto out_elf_end;
 
 	/*
-	 * Fetch the relocation section to find the indexes to the GOT
+	 * Fetch the relocation section to find the idxes to the GOT
 	 * and the symbols in the .dynsym they refer to.
 	 */
 	reldata = elf_getdata(scn_plt_rel, NULL);
@@ -476,7 +476,7 @@ static int dso__synthesize_plt_symbols(struct  dso *self, int verbose)
 				 "%s@plt", elf_sym__name(&sym, symstrs));
 
 			f = symbol__new(plt_offset, shdr_plt.sh_entsize,
-					sympltname, self->sym_priv_size, 0, verbose);
+					sympltname, self->sym_priv_size, 0, v);
 			if (!f)
 				goto out_elf_end;
 
@@ -494,7 +494,7 @@ static int dso__synthesize_plt_symbols(struct  dso *self, int verbose)
 				 "%s@plt", elf_sym__name(&sym, symstrs));
 
 			f = symbol__new(plt_offset, shdr_plt.sh_entsize,
-					sympltname, self->sym_priv_size, 0, verbose);
+					sympltname, self->sym_priv_size, 0, v);
 			if (!f)
 				goto out_elf_end;
 
@@ -518,12 +518,12 @@ out:
 }
 
 static int dso__load_sym(struct dso *self, int fd, const char *name,
-			 symbol_filter_t filter, int verbose, struct module *mod)
+			 symbol_filter_t filter, int v, struct module *mod)
 {
 	Elf_Data *symstrs, *secstrs;
 	uint32_t nr_syms;
 	int err = -1;
-	uint32_t index;
+	uint32_t idx;
 	GElf_Ehdr ehdr;
 	GElf_Shdr shdr;
 	Elf_Data *syms;
@@ -534,14 +534,14 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
 
 	elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
 	if (elf == NULL) {
-		if (verbose)
+		if (v)
 			fprintf(stderr, "%s: cannot read %s ELF file.\n",
 				__func__, name);
 		goto out_close;
 	}
 
 	if (gelf_getehdr(elf, &ehdr) == NULL) {
-		if (verbose)
+		if (v)
 			fprintf(stderr, "%s: cannot get elf header.\n", __func__);
 		goto out_elf_end;
 	}
@@ -583,9 +583,9 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
 						     NULL) != NULL);
 	} else self->adjust_symbols = 0;
 
-	elf_symtab__for_each_symbol(syms, nr_syms, index, sym) {
+	elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
 		struct symbol *f;
-		const char *name;
+		const char *elf_name;
 		char *demangled;
 		u64 obj_start;
 		struct section *section = NULL;
@@ -608,7 +608,7 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
 		obj_start = sym.st_value;
 
 		if (self->adjust_symbols) {
-			if (verbose >= 2)
+			if (v >= 2)
 				printf("adjusting symbol: st_value: %Lx sh_addr: %Lx sh_offset: %Lx\n",
 					(u64)sym.st_value, (u64)shdr.sh_addr, (u64)shdr.sh_offset);
 
@@ -630,13 +630,13 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
 		 * DWARF DW_compile_unit has this, but we don't always have access
 		 * to it...
 		 */
-		name = elf_sym__name(&sym, symstrs);
-		demangled = bfd_demangle(NULL, name, DMGL_PARAMS | DMGL_ANSI);
+		elf_name = elf_sym__name(&sym, symstrs);
+		demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
 		if (demangled != NULL)
-			name = demangled;
+			elf_name = demangled;
 
-		f = symbol__new(sym.st_value, sym.st_size, name,
-				self->sym_priv_size, obj_start, verbose);
+		f = symbol__new(sym.st_value, sym.st_size, elf_name,
+				self->sym_priv_size, obj_start, v);
 		free(demangled);
 		if (!f)
 			goto out_elf_end;
@@ -659,7 +659,7 @@ out_close:
 
 #define BUILD_ID_SIZE 128
 
-static char *dso__read_build_id(struct dso *self, int verbose)
+static char *dso__read_build_id(struct dso *self, int v)
 {
 	int i;
 	GElf_Ehdr ehdr;
@@ -676,14 +676,14 @@ static char *dso__read_build_id(struct dso *self, int verbose)
 
 	elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
 	if (elf == NULL) {
-		if (verbose)
+		if (v)
 			fprintf(stderr, "%s: cannot read %s ELF file.\n",
 				__func__, self->name);
 		goto out_close;
 	}
 
 	if (gelf_getehdr(elf, &ehdr) == NULL) {
-		if (verbose)
+		if (v)
 			fprintf(stderr, "%s: cannot get elf header.\n", __func__);
 		goto out_elf_end;
 	}
@@ -706,7 +706,7 @@ static char *dso__read_build_id(struct dso *self, int verbose)
 		++raw;
 		bid += 2;
 	}
-	if (verbose >= 2)
+	if (v >= 2)
 		printf("%s(%s): %s\n", __func__, self->name, build_id);
 out_elf_end:
 	elf_end(elf);
@@ -732,7 +732,7 @@ char dso__symtab_origin(const struct dso *self)
 	return origin[self->origin];
 }
 
-int dso__load(struct dso *self, symbol_filter_t filter, int verbose)
+int dso__load(struct dso *self, symbol_filter_t filter, int v)
 {
 	int size = PATH_MAX;
 	char *name = malloc(size), *build_id = NULL;
@@ -745,7 +745,7 @@ int dso__load(struct dso *self, symbol_filter_t filter, int verbose)
 	self->adjust_symbols = 0;
 
 	if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
-		ret = dso__load_perf_map(self, filter, verbose);
+		ret = dso__load_perf_map(self, filter, v);
 		self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
 					 DSO__ORIG_NOT_FOUND;
 		return ret;
@@ -764,7 +764,7 @@ more:
 			snprintf(name, size, "/usr/lib/debug%s", self->name);
 			break;
 		case DSO__ORIG_BUILDID:
-			build_id = dso__read_build_id(self, verbose);
+			build_id = dso__read_build_id(self, v);
 			if (build_id != NULL) {
 				snprintf(name, size,
 					 "/usr/lib/debug/.build-id/%.2s/%s.debug",
@@ -785,7 +785,7 @@ more:
 		fd = open(name, O_RDONLY);
 	} while (fd < 0);
 
-	ret = dso__load_sym(self, fd, name, filter, verbose, NULL);
+	ret = dso__load_sym(self, fd, name, filter, v, NULL);
 	close(fd);
 
 	/*
@@ -795,7 +795,7 @@ more:
 		goto more;
 
 	if (ret > 0) {
-		int nr_plt = dso__synthesize_plt_symbols(self, verbose);
+		int nr_plt = dso__synthesize_plt_symbols(self, v);
 		if (nr_plt > 0)
 			ret += nr_plt;
 	}
@@ -807,7 +807,7 @@ out:
 }
 
 static int dso__load_module(struct dso *self, struct mod_dso *mods, const char *name,
-			     symbol_filter_t filter, int verbose)
+			     symbol_filter_t filter, int v)
 {
 	struct module *mod = mod_dso__find_module(mods, name);
 	int err = 0, fd;
@@ -820,13 +820,13 @@ static int dso__load_module(struct dso *self, struct mod_dso *mods, const char *
 	if (fd < 0)
 		return err;
 
-	err = dso__load_sym(self, fd, name, filter, verbose, mod);
+	err = dso__load_sym(self, fd, name, filter, v, mod);
 	close(fd);
 
 	return err;
 }
 
-int dso__load_modules(struct dso *self, symbol_filter_t filter, int verbose)
+int dso__load_modules(struct dso *self, symbol_filter_t filter, int v)
 {
 	struct mod_dso *mods = mod_dso__new_dso("modules");
 	struct module *pos;
@@ -844,7 +844,7 @@ int dso__load_modules(struct dso *self, symbol_filter_t filter, int verbose)
 	next = rb_first(&mods->mods);
 	while (next) {
 		pos = rb_entry(next, struct module, rb_node);
-		err = dso__load_module(self, mods, pos->name, filter, verbose);
+		err = dso__load_module(self, mods, pos->name, filter, v);
 
 		if (err < 0)
 			break;
@@ -887,14 +887,14 @@ static inline void dso__fill_symbol_holes(struct dso *self)
 }
 
 static int dso__load_vmlinux(struct dso *self, const char *vmlinux,
-			     symbol_filter_t filter, int verbose)
+			     symbol_filter_t filter, int v)
 {
 	int err, fd = open(vmlinux, O_RDONLY);
 
 	if (fd < 0)
 		return -1;
 
-	err = dso__load_sym(self, fd, vmlinux, filter, verbose, NULL);
+	err = dso__load_sym(self, fd, vmlinux, filter, v, NULL);
 
 	if (err > 0)
 		dso__fill_symbol_holes(self);
@@ -905,18 +905,18 @@ static int dso__load_vmlinux(struct dso *self, const char *vmlinux,
 }
 
 int dso__load_kernel(struct dso *self, const char *vmlinux,
-		     symbol_filter_t filter, int verbose, int modules)
+		     symbol_filter_t filter, int v, int use_modules)
 {
 	int err = -1;
 
 	if (vmlinux) {
-		err = dso__load_vmlinux(self, vmlinux, filter, verbose);
-		if (err > 0 && modules)
-			err = dso__load_modules(self, filter, verbose);
+		err = dso__load_vmlinux(self, vmlinux, filter, v);
+		if (err > 0 && use_modules)
+			err = dso__load_modules(self, filter, v);
 	}
 
 	if (err <= 0)
-		err = dso__load_kallsyms(self, filter, verbose);
+		err = dso__load_kallsyms(self, filter, v);
 
 	if (err > 0)
 		self->origin = DSO__ORIG_KERNEL;
@@ -929,7 +929,7 @@ struct dso	*kernel_dso;
 struct dso	*vdso;
 struct dso	*hypervisor_dso;
 
-char		*vmlinux = "vmlinux";
+const char	*vmlinux_name = "vmlinux";
 int		modules;
 
 static void dsos__add(struct dso *dso)
@@ -997,7 +997,7 @@ int load_kernel(void)
 	if (!kernel_dso)
 		return -1;
 
-	err = dso__load_kernel(kernel_dso, vmlinux, NULL, verbose, modules);
+	err = dso__load_kernel(kernel_dso, vmlinux_name, NULL, verbose, modules);
 	if (err <= 0) {
 		dso__delete(kernel_dso);
 		kernel_dso = NULL;