[Xen-devel] [PATCH RFC V4 10/10] jump-label: initialize jump-label subsystem much earlier

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

Initialize jump_labels much earlier, we can use them.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
 include/linux/jump_label.h |   14 +++++++++-----
 init/main.c                |    1 +
 kernel/jump_label.c        |    5 +----
 3 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
index 56594e4..388b0d4 100644
--- a/include/linux/jump_label.h
+++ b/include/linux/jump_label.h
@@ -16,7 +16,7 @@ struct jump_label_key {
 
 # include <asm/jump_label.h>
 # define HAVE_JUMP_LABEL
-#endif
+#endif /* CC_HAVE_ASM_GOTO && CONFIG_JUMP_LABEL */
 
 enum jump_label_type {
        JUMP_LABEL_DISABLE = 0,
@@ -41,6 +41,7 @@ static __always_inline bool static_branch(struct 
jump_label_key *key)
 extern struct jump_entry __start___jump_table[];
 extern struct jump_entry __stop___jump_table[];
 
+extern void jump_label_init(void);
 extern void jump_label_lock(void);
 extern void jump_label_unlock(void);
 extern void arch_jump_label_transform(struct jump_entry *entry,
@@ -53,7 +54,7 @@ extern void jump_label_dec(struct jump_label_key *key);
 extern bool jump_label_enabled(struct jump_label_key *key);
 extern void jump_label_apply_nops(struct module *mod);
 
-#else
+#else  /* !HAVE_JUMP_LABEL */
 
 #include <linux/atomic.h>
 
@@ -63,6 +64,10 @@ struct jump_label_key {
        atomic_t enabled;
 };
 
+static __always_inline void jump_label_init(void)
+{
+}
+
 static __always_inline bool static_branch(struct jump_label_key *key)
 {
        if (unlikely(atomic_read(&key->enabled)))
@@ -97,7 +102,6 @@ static inline int jump_label_apply_nops(struct module *mod)
 {
        return 0;
 }
+#endif /* HAVE_JUMP_LABEL */
 
-#endif
-
-#endif
+#endif /* _LINUX_JUMP_LABEL_H */
diff --git a/init/main.c b/init/main.c
index 2a9b88a..f4094ed 100644
--- a/init/main.c
+++ b/init/main.c
@@ -637,6 +637,7 @@ asmlinkage void __init start_kernel(void)
        acpi_early_init(); /* before LAPIC and SMP init */
        sfi_init_late();
 
+       jump_label_init();
        ftrace_init();
 
        /* Do the rest non-__init'ed, we're now alive */
diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index ff2028f..bbdfe2a 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -133,7 +133,7 @@ static void __jump_label_update(struct jump_label_key *key,
        }
 }
 
-static __init int jump_label_init(void)
+void __init jump_label_init(void)
 {
        struct jump_entry *iter_start = __start___jump_table;
        struct jump_entry *iter_stop = __stop___jump_table;
@@ -159,10 +159,7 @@ static __init int jump_label_init(void)
 #endif
        }
        jump_label_unlock();
-
-       return 0;
 }
-early_initcall(jump_label_init);
 
 #ifdef CONFIG_MODULES
 
-- 
1.7.6.4


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