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jump_label: Abstract jump_entry member accessors

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In preparation of allowing architectures to use relative references
in jump_label entries [which can dramatically reduce the memory
footprint], introduce abstractions for references to the 'code' and
'key' members of struct jump_entry.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-s390@vger.kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Jessica Yu <jeyu@kernel.org>
Link: https://lkml.kernel.org/r/20180919065144.25010-2-ard.biesheuvel@linaro.org
This commit is contained in:
Ard Biesheuvel
2018-09-18 23:51:36 -07:00
committed by Thomas Gleixner
parent 6bf4ca7fbc
commit 9ae033aca8
2 changed files with 49 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
include/linux/jump_label.h
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@@ -119,6 +119,40 @@ struct static_key {
#ifdef HAVE_JUMP_LABEL
#include <asm/jump_label.h>
#ifndef __ASSEMBLY__
static inline unsigned long jump_entry_code(const struct jump_entry *entry)
{
return entry->code;
}
static inline unsigned long jump_entry_target(const struct jump_entry *entry)
{
return entry->target;
}
static inline struct static_key *jump_entry_key(const struct jump_entry *entry)
{
return (struct static_key *)((unsigned long)entry->key & ~1UL);
}
static inline bool jump_entry_is_branch(const struct jump_entry *entry)
{
return (unsigned long)entry->key & 1UL;
}
static inline bool jump_entry_is_init(const struct jump_entry *entry)
{
return entry->code == 0;
}
static inline void jump_entry_set_init(struct jump_entry *entry)
{
entry->code = 0;
}
#endif
#endif
#ifndef __ASSEMBLY__