sparc64: Improvde documentation and readability of atomic backoff code.

Document what's going on in asm/backoff.h with a large and descriptive
comment.  Refer to it above the cpu_relax() definition in
asm/processor_64.h

Rename the pause patching section to have "3insn" in it's name like
the other patching sections do.

Based upon feedback from Sam Ravnborg.

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 8 insertions, 8 deletions

diff --git a/arch/sparc/kernel/entry.h b/arch/sparc/kernel/entry.h
index 51742df63c75..cc3c5cb47cda 100644
--- a/arch/sparc/kernel/entry.h
+++ b/arch/sparc/kernel/entry.h
@@ -63,8 +63,8 @@ struct pause_patch_entry {
         unsigned int    addr;
         unsigned int    insns[3];
 };
-extern struct pause_patch_entry __pause_patch,
-        __pause_patch_end;
+extern struct pause_patch_entry __pause_3insn_patch,
+        __pause_3insn_patch_end;
 
 extern void __init per_cpu_patch(void);
 extern void sun4v_patch_1insn_range(struct sun4v_1insn_patch_entry *,
diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
index b45cff408de3..0eaf0059aaef 100644
--- a/arch/sparc/kernel/setup_64.c
+++ b/arch/sparc/kernel/setup_64.c
@@ -320,8 +320,8 @@ static void __init pause_patch(void)
 {
         struct pause_patch_entry *p;
 
-        p = &__pause_patch;
-        while (p < &__pause_patch_end) {
+        p = &__pause_3insn_patch;
+        while (p < &__pause_3insn_patch_end) {
                 unsigned long i, addr = p->addr;
 
                 for (i = 0; i < 3; i++) {
diff --git a/arch/sparc/kernel/vmlinux.lds.S b/arch/sparc/kernel/vmlinux.lds.S
index 847f9f793618..0bacceb19150 100644
--- a/arch/sparc/kernel/vmlinux.lds.S
+++ b/arch/sparc/kernel/vmlinux.lds.S
@@ -132,10 +132,10 @@ SECTIONS
                 *(.popc_6insn_patch)
                 __popc_6insn_patch_end = .;
         }
-        .pause_patch : {
-                __pause_patch = .;
-                *(.pause_patch)
-                __pause_patch_end = .;
+        .pause_3insn_patch : {
+                __pause_3insn_patch = .;
+                *(.pause_3insn_patch)
+                __pause_3insn_patch_end = .;
         }
         PERCPU_SECTION(SMP_CACHE_BYTES)