diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-10 19:43:23 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-10 19:43:23 -0700 |
| commit | 442e0973e9273ae8832abd70f52efde8b8326178 (patch) | |
| tree | e2358f77f76143fe0f524c5a0e26cb940972e5c1 /arch/x86/include | |
| parent | 8d7551eb1916832f2a5b27346edf24e7b2382f67 (diff) | |
| parent | fb40d7a8994a3cc7a1e1c1f3258ea8662a366916 (diff) | |
Merge branch 'x86/jumplabel' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 jumplabel changes from Peter Anvin:
"One more x86 tree for this merge window. This tree improves the
handling of jump labels, so that most of the time we don't have to do
a massive initial patching run.
Furthermore, we will error out of the jump label is not what is
expected, eg if it has been corrupted or tampered with"
* 'x86/jumplabel' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/jump-label: Show where and what was wrong on errors
x86/jump-label: Add safety checks to jump label conversions
x86/jump-label: Do not bother updating nops if they are correct
x86/jump-label: Use best default nops for inital jump label calls
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/jump_label.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h index 3a16c1483b45..64507f35800c 100644 --- a/arch/x86/include/asm/jump_label.h +++ b/arch/x86/include/asm/jump_label.h @@ -3,18 +3,23 @@ #ifdef __KERNEL__ +#include <linux/stringify.h> #include <linux/types.h> #include <asm/nops.h> #include <asm/asm.h> #define JUMP_LABEL_NOP_SIZE 5 -#define STATIC_KEY_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t" +#ifdef CONFIG_X86_64 +# define STATIC_KEY_INIT_NOP P6_NOP5_ATOMIC +#else +# define STATIC_KEY_INIT_NOP GENERIC_NOP5_ATOMIC +#endif static __always_inline bool arch_static_branch(struct static_key *key) { asm goto("1:" - STATIC_KEY_INITIAL_NOP + ".byte " __stringify(STATIC_KEY_INIT_NOP) "\n\t" ".pushsection __jump_table, \"aw\" \n\t" _ASM_ALIGN "\n\t" _ASM_PTR "1b, %l[l_yes], %c0 \n\t" |