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Revision 8c89ecf5c13b0504018c5045896a0b78d5d811e6 authored by Alexander Potapenko on 11 January 2023, 10:50:12 UTC, committed by Alexander Potapenko on 07 February 2023, 09:50:25 UTC 
kmsan: silence -Wmissing-prototypes warnings
 
When building the kernel with W=1, the compiler reports numerous
warnings about the missing prototypes for KMSAN instrumentation hooks.

Because these functions are not supposed to be called explicitly by the
kernel code (calls to them are emitted by the compiler), they do not
have to be declared in the headers. Instead, we add forward declarations
right before the definitions to silence the warnings produced by
-Wmissing-prototypes.

Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/202301020356.dFruA4I5-lkp@intel.com/T/
Reported-by: Vlastimil Babka <vbabka@suse.cz>
Suggested-by: Marco Elver <elver@google.com>
Signed-off-by: Alexander Potapenko <glider@google.com>
1 parent 8b0ffea
Raw File
elf.h 
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_ELF_H
#define _LINUX_ELF_H

#include <linux/types.h>
#include <asm/elf.h>
#include <uapi/linux/elf.h>

#ifndef elf_read_implies_exec
  /* Executables for which elf_read_implies_exec() returns TRUE will
     have the READ_IMPLIES_EXEC personality flag set automatically.
     Override in asm/elf.h as needed.  */
# define elf_read_implies_exec(ex, have_pt_gnu_stack)	0
#endif
#ifndef SET_PERSONALITY
#define SET_PERSONALITY(ex) \
	set_personality(PER_LINUX | (current->personality & (~PER_MASK)))
#endif

#ifndef SET_PERSONALITY2
#define SET_PERSONALITY2(ex, state) \
	SET_PERSONALITY(ex)
#endif

#ifndef START_THREAD
#define START_THREAD(elf_ex, regs, elf_entry, start_stack)	\
	start_thread(regs, elf_entry, start_stack)
#endif

#if defined(ARCH_HAS_SETUP_ADDITIONAL_PAGES) && !defined(ARCH_SETUP_ADDITIONAL_PAGES)
#define ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \
	arch_setup_additional_pages(bprm, interpreter)
#endif

#define ELF32_GNU_PROPERTY_ALIGN	4
#define ELF64_GNU_PROPERTY_ALIGN	8

#if ELF_CLASS == ELFCLASS32

extern Elf32_Dyn _DYNAMIC [];
#define elfhdr		elf32_hdr
#define elf_phdr	elf32_phdr
#define elf_shdr	elf32_shdr
#define elf_note	elf32_note
#define elf_addr_t	Elf32_Off
#define Elf_Half	Elf32_Half
#define Elf_Word	Elf32_Word
#define ELF_GNU_PROPERTY_ALIGN	ELF32_GNU_PROPERTY_ALIGN

#else

extern Elf64_Dyn _DYNAMIC [];
#define elfhdr		elf64_hdr
#define elf_phdr	elf64_phdr
#define elf_shdr	elf64_shdr
#define elf_note	elf64_note
#define elf_addr_t	Elf64_Off
#define Elf_Half	Elf64_Half
#define Elf_Word	Elf64_Word
#define ELF_GNU_PROPERTY_ALIGN	ELF64_GNU_PROPERTY_ALIGN

#endif

/* Optional callbacks to write extra ELF notes. */
struct file;
struct coredump_params;

#ifndef ARCH_HAVE_EXTRA_ELF_NOTES
static inline int elf_coredump_extra_notes_size(void) { return 0; }
static inline int elf_coredump_extra_notes_write(struct coredump_params *cprm) { return 0; }
#else
extern int elf_coredump_extra_notes_size(void);
extern int elf_coredump_extra_notes_write(struct coredump_params *cprm);
#endif

/*
 * NT_GNU_PROPERTY_TYPE_0 header:
 * Keep this internal until/unless there is an agreed UAPI definition.
 * pr_type values (GNU_PROPERTY_*) are public and defined in the UAPI header.
 */
struct gnu_property {
	u32 pr_type;
	u32 pr_datasz;
};

struct arch_elf_state;

#ifndef CONFIG_ARCH_USE_GNU_PROPERTY
static inline int arch_parse_elf_property(u32 type, const void *data,
					  size_t datasz, bool compat,
					  struct arch_elf_state *arch)
{
	return 0;
}
#else
extern int arch_parse_elf_property(u32 type, const void *data, size_t datasz,
				   bool compat, struct arch_elf_state *arch);
#endif

#ifdef CONFIG_ARCH_HAVE_ELF_PROT
int arch_elf_adjust_prot(int prot, const struct arch_elf_state *state,
			 bool has_interp, bool is_interp);
#else
static inline int arch_elf_adjust_prot(int prot,
				       const struct arch_elf_state *state,
				       bool has_interp, bool is_interp)
{
	return prot;
}
#endif

#endif /* _LINUX_ELF_H */
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