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objtool: Constify 'struct elf *' parameters

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In preparation to parallelize certain parts of objtool, map out which uses
of various data structures are read-only vs. read-write.

As a first step constify 'struct elf' pointer passing, most of the secondary
uses of it in find_symbol_*() methods are read-only.

Also, while at it, better group the 'struct elf' handling methods in elf.h.

Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sami Tolvanen <samitolvanen@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20200422103205.61900-2-mingo@kernel.org
This commit is contained in:
Ingo Molnar 2020-04-22 12:32:03 +02:00
parent 0cc9ac8db0
commit 894e48cada
2 changed files with 15 additions and 15 deletions
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10
tools/objtool/elf.c
View File

@ -127,7 +127,7 @@ static int symbol_by_offset(const void *key, const struct rb_node *node)
return 0;
}
struct section *find_section_by_name(struct elf *elf, const char *name)
struct section *find_section_by_name(const struct elf *elf, const char *name)
{
struct section *sec;
@ -217,7 +217,7 @@ struct symbol *find_func_containing(struct section *sec, unsigned long offset)
return NULL;
}
struct symbol *find_symbol_by_name(struct elf *elf, const char *name)
struct symbol *find_symbol_by_name(const struct elf *elf, const char *name)
{
struct symbol *sym;
@ -228,7 +228,7 @@ struct symbol *find_symbol_by_name(struct elf *elf, const char *name)
return NULL;
}
struct rela *find_rela_by_dest_range(struct elf *elf, struct section *sec,
struct rela *find_rela_by_dest_range(const struct elf *elf, struct section *sec,
unsigned long offset, unsigned int len)
{
struct rela *rela, *r = NULL;
@ -257,7 +257,7 @@ struct rela *find_rela_by_dest_range(struct elf *elf, struct section *sec,
return NULL;
}
struct rela *find_rela_by_dest(struct elf *elf, struct section *sec, unsigned long offset)
struct rela *find_rela_by_dest(const struct elf *elf, struct section *sec, unsigned long offset)
{
return find_rela_by_dest_range(elf, sec, offset, 1);
}
@ -769,7 +769,7 @@ int elf_rebuild_rela_section(struct section *sec)
return 0;
}
int elf_write(struct elf *elf)
int elf_write(const struct elf *elf)
{
struct section *sec;
Elf_Scn *s;

20
tools/objtool/elf.h
View File

@ -114,22 +114,22 @@ static inline u32 rela_hash(struct rela *rela)
}
struct elf *elf_read(const char *name, int flags);
struct section *find_section_by_name(struct elf *elf, const char *name);
struct section *elf_create_section(struct elf *elf, const char *name, size_t entsize, int nr);
struct section *elf_create_rela_section(struct elf *elf, struct section *base);
void elf_add_rela(struct elf *elf, struct rela *rela);
int elf_write(const struct elf *elf);
void elf_close(struct elf *elf);
struct section *find_section_by_name(const struct elf *elf, const char *name);
struct symbol *find_func_by_offset(struct section *sec, unsigned long offset);
struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset);
struct symbol *find_symbol_by_name(struct elf *elf, const char *name);
struct symbol *find_symbol_by_name(const struct elf *elf, const char *name);
struct symbol *find_symbol_containing(struct section *sec, unsigned long offset);
struct rela *find_rela_by_dest(struct elf *elf, struct section *sec, unsigned long offset);
struct rela *find_rela_by_dest_range(struct elf *elf, struct section *sec,
struct rela *find_rela_by_dest(const struct elf *elf, struct section *sec, unsigned long offset);
struct rela *find_rela_by_dest_range(const struct elf *elf, struct section *sec,
unsigned long offset, unsigned int len);
struct symbol *find_func_containing(struct section *sec, unsigned long offset);
struct section *elf_create_section(struct elf *elf, const char *name, size_t
entsize, int nr);
struct section *elf_create_rela_section(struct elf *elf, struct section *base);
int elf_rebuild_rela_section(struct section *sec);
int elf_write(struct elf *elf);
void elf_close(struct elf *elf);
void elf_add_rela(struct elf *elf, struct rela *rela);
#define for_each_sec(file, sec) \
list_for_each_entry(sec, &file->elf->sections, list)