[Xen-devel] [PATCH RFC 4/8] sparc/jump_label: add arch_jump_label_transform_early()

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

This allows jump-label entries to be modified early, in a pre-SMP
environment.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
---
 arch/sparc/kernel/jump_label.c |   24 +++++++++++++++---------
 1 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/arch/sparc/kernel/jump_label.c b/arch/sparc/kernel/jump_label.c
index ea2dafc..d3dad25 100644
--- a/arch/sparc/kernel/jump_label.c
+++ b/arch/sparc/kernel/jump_label.c
@@ -8,8 +8,8 @@
 
 #ifdef HAVE_JUMP_LABEL
 
-void arch_jump_label_transform(struct jump_entry *entry,
-                              enum jump_label_type type)
+static void __jump_label_transform(struct jump_entry *entry,
+                                  enum jump_label_type type)
 {
        u32 val;
        u32 *insn = (u32 *) (unsigned long) entry->code;
@@ -28,20 +28,26 @@ void arch_jump_label_transform(struct jump_entry *entry,
                val = 0x01000000;
        }
 
-       get_online_cpus();
-       mutex_lock(&text_mutex);
        *insn = val;
        flushi(insn);
+}
+
+void arch_jump_label_transform(struct jump_entry *entry,
+                              enum jump_label_type type)
+{
+       get_online_cpus();
+       mutex_lock(&text_mutex);
+
+       __jump_label_transform(entry, type);
+
        mutex_unlock(&text_mutex);
        put_online_cpus();
 }
 
-void arch_jump_label_text_poke_early(jump_label_t addr)
+void __init arch_jump_label_transform_early(struct jump_entry *entry,
+                                           enum jump_label_type type)
 {
-       u32 *insn_p = (u32 *) (unsigned long) addr;
-
-       *insn_p = 0x01000000;
-       flushi(insn_p);
+       __jump_label_transform(entry, type);
 }
 
 #endif
-- 
1.7.6.2


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