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Date: Tue, 31 Jan 2017 19:52:11 +0100
From: Nicolas Iooss <nicolas.iooss_linux@....org>
To: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/1] x86, relocs: add printf attribute to die()
Hello,
As I have not received any comment on the patch I sent in December, I am
wondering whether I did anything wrong with it. How can I get it queued
for the next merge window?
Thanks,
Nicolas
On 18/12/16 20:47, Nicolas Iooss wrote:
> Adding such an attribute helps to detect errors in the format string at
> build time. After doing this, the compiler complains about such issues:
>
> arch/x86/tools/relocs.c:460:5: error: format specifies type 'int'
> but the argument has type 'Elf64_Xword' (aka 'unsigned long')
> [-Werror,-Wformat]
> sec->shdr.sh_size);
> ^~~~~~~~~~~~~~~~~
> arch/x86/tools/relocs.c:464:5: error: format specifies type 'int'
> but the argument has type 'Elf64_Off' (aka 'unsigned long')
> [-Werror,-Wformat]
> sec->shdr.sh_offset, strerror(errno));
> ^~~~~~~~~~~~~~~~~~~
>
> When relocs.c is included by relocs_32.c, sec->shdr.sh_size and
> sec->shdr.sh_offset are 32-bit unsigned integers. When the file is
> included by relocs_64.c, these expressions are 64-bit unsigned integers.
>
> Introduce a PRIuELF macro to define the right format to use when
> printing sh_size and sh_offset values.
>
> While at it, constify the format attribute of die().
>
> Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@....org>
> ---
> I sent the first versions of this patch in September (cf.
> https://patchwork.kernel.org/patch/9312665/) but it has not been
> applied.
>
> As commit adee8705d251 ("x86/build: Annotate die() with noreturn to fix
> build warning on clang") introduced the noreturn attribute to die(),
> this patch now only adds the printf attribute.
>
> arch/x86/tools/relocs.c | 14 +++++++-------
> arch/x86/tools/relocs.h | 3 ++-
> arch/x86/tools/relocs_32.c | 3 +++
> arch/x86/tools/relocs_64.c | 3 +++
> arch/x86/tools/relocs_common.c | 2 +-
> 5 files changed, 16 insertions(+), 9 deletions(-)
>
> diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
> index 0c2fae8d929d..4cad603b8d58 100644
> --- a/arch/x86/tools/relocs.c
> +++ b/arch/x86/tools/relocs.c
> @@ -397,7 +397,7 @@ static void read_shdrs(FILE *fp)
> ehdr.e_shnum);
> }
> if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) {
> - die("Seek to %d failed: %s\n",
> + die("Seek to %"PRIuELF" failed: %s\n",
> ehdr.e_shoff, strerror(errno));
> }
> for (i = 0; i < ehdr.e_shnum; i++) {
> @@ -431,11 +431,11 @@ static void read_strtabs(FILE *fp)
> }
> sec->strtab = malloc(sec->shdr.sh_size);
> if (!sec->strtab) {
> - die("malloc of %d bytes for strtab failed\n",
> + die("malloc of %"PRIuELF" bytes for strtab failed\n",
> sec->shdr.sh_size);
> }
> if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
> - die("Seek to %d failed: %s\n",
> + die("Seek to %"PRIuELF" failed: %s\n",
> sec->shdr.sh_offset, strerror(errno));
> }
> if (fread(sec->strtab, 1, sec->shdr.sh_size, fp)
> @@ -456,11 +456,11 @@ static void read_symtabs(FILE *fp)
> }
> sec->symtab = malloc(sec->shdr.sh_size);
> if (!sec->symtab) {
> - die("malloc of %d bytes for symtab failed\n",
> + die("malloc of %"PRIuELF" bytes for symtab failed\n",
> sec->shdr.sh_size);
> }
> if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
> - die("Seek to %d failed: %s\n",
> + die("Seek to %"PRIuELF" failed: %s\n",
> sec->shdr.sh_offset, strerror(errno));
> }
> if (fread(sec->symtab, 1, sec->shdr.sh_size, fp)
> @@ -489,11 +489,11 @@ static void read_relocs(FILE *fp)
> }
> sec->reltab = malloc(sec->shdr.sh_size);
> if (!sec->reltab) {
> - die("malloc of %d bytes for relocs failed\n",
> + die("malloc of %"PRIuELF" bytes for relocs failed\n",
> sec->shdr.sh_size);
> }
> if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
> - die("Seek to %d failed: %s\n",
> + die("Seek to %"PRIuELF" failed: %s\n",
> sec->shdr.sh_offset, strerror(errno));
> }
> if (fread(sec->reltab, 1, sec->shdr.sh_size, fp)
> diff --git a/arch/x86/tools/relocs.h b/arch/x86/tools/relocs.h
> index 1d23bf953a4a..f41416c31608 100644
> --- a/arch/x86/tools/relocs.h
> +++ b/arch/x86/tools/relocs.h
> @@ -16,7 +16,8 @@
> #include <regex.h>
> #include <tools/le_byteshift.h>
>
> -void die(char *fmt, ...) __attribute__((noreturn));
> +void die(const char *fmt, ...) __attribute__((noreturn))
> + __attribute__((format(printf, 1, 2)));
>
> #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
>
> diff --git a/arch/x86/tools/relocs_32.c b/arch/x86/tools/relocs_32.c
> index b2ade2bb4162..8024ec473e6a 100644
> --- a/arch/x86/tools/relocs_32.c
> +++ b/arch/x86/tools/relocs_32.c
> @@ -14,4 +14,7 @@
> #define ELF_ST_BIND(o) ELF32_ST_BIND(o)
> #define ELF_ST_VISIBILITY(o) ELF32_ST_VISIBILITY(o)
>
> +/* printf format for Elf32_Off */
> +#define PRIuELF PRIu32
> +
> #include "relocs.c"
> diff --git a/arch/x86/tools/relocs_64.c b/arch/x86/tools/relocs_64.c
> index 56b61b743c4c..2cf4de5c9d99 100644
> --- a/arch/x86/tools/relocs_64.c
> +++ b/arch/x86/tools/relocs_64.c
> @@ -14,4 +14,7 @@
> #define ELF_ST_BIND(o) ELF64_ST_BIND(o)
> #define ELF_ST_VISIBILITY(o) ELF64_ST_VISIBILITY(o)
>
> +/* printf format for Elf64_Off */
> +#define PRIuELF PRIu64
> +
> #include "relocs.c"
> diff --git a/arch/x86/tools/relocs_common.c b/arch/x86/tools/relocs_common.c
> index acab636bcb34..30adb44eff79 100644
> --- a/arch/x86/tools/relocs_common.c
> +++ b/arch/x86/tools/relocs_common.c
> @@ -1,6 +1,6 @@
> #include "relocs.h"
>
> -void die(char *fmt, ...)
> +void die(const char *fmt, ...)
> {
> va_list ap;
> va_start(ap, fmt);
>
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