ELF, uapi: fixup ELF_ST_TYPE definition

This is very theoretical compile failure:

	ELF_ST_TYPE(st_info = A)

Cast will bind first and st_info will stop being lvalue:

	error: lvalue required as left operand of assignment

Given that the only use of this macro is

	ELF_ST_TYPE(sym->st_info)

where st_info is "unsigned char" I've decided to remove cast especially
given that companion macro ELF_ST_BIND doesn't use cast.

Link: https://lkml.kernel.org/r/Ymv7G1BeX4kt3obz@localhost.localdomain
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index 787c657..237f21a 100644 (file)
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h
@@ -134,7 +134,7 @@ typedef __s64       Elf64_Sxword;
 #define STT_TLS     6
 
 #define ELF_ST_BIND(x)         ((x) >> 4)
-#define ELF_ST_TYPE(x)         (((unsigned int) x) & 0xf)
+#define ELF_ST_TYPE(x)         ((x) & 0xf)
 #define ELF32_ST_BIND(x)       ELF_ST_BIND(x)
 #define ELF32_ST_TYPE(x)       ELF_ST_TYPE(x)
 #define ELF64_ST_BIND(x)       ELF_ST_BIND(x)