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Date: Wed, 28 Jul 2010 22:25:51 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: jbaron@...hat.com
Cc: linux-kernel@...r.kernel.org, mingo@...e.hu,
mathieu.desnoyers@...ymtl.ca, hpa@...or.com, tglx@...utronix.de,
rostedt@...dmis.org, andi@...stfloor.org, roland@...hat.com,
rth@...hat.com, mhiramat@...hat.com, fweisbec@...il.com,
avi@...hat.com, vgoyal@...hat.com, sam@...nborg.org,
tony@...eyournoodle.com
Subject: Re: [PATCH 00/12] jump label v10
Jason, here is an updated version of patch #11 which makes sparc
properly use a branch instead of a call instruction.
Thanks.
--------------------
jump label: add sparc64 support
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jason Baron <jbaron@...hat.com>
---
arch/sparc/Kconfig | 1 +
arch/sparc/include/asm/jump_label.h | 32 ++++++++++++++++++++++++
arch/sparc/kernel/Makefile | 2 +
arch/sparc/kernel/jump_label.c | 46 +++++++++++++++++++++++++++++++++++
arch/sparc/kernel/module.c | 6 ++++
5 files changed, 87 insertions(+), 0 deletions(-)
create mode 100644 arch/sparc/include/asm/jump_label.h
create mode 100644 arch/sparc/kernel/jump_label.c
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index c0015db..e38d976 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -29,6 +29,7 @@ config SPARC
select PERF_USE_VMALLOC
select HAVE_DMA_ATTRS
select HAVE_DMA_API_DEBUG
+ select HAVE_ARCH_JUMP_LABEL if !CC_OPTIMIZE_FOR_SIZE
config SPARC32
def_bool !64BIT
diff --git a/arch/sparc/include/asm/jump_label.h b/arch/sparc/include/asm/jump_label.h
new file mode 100644
index 0000000..62e66d7
--- /dev/null
+++ b/arch/sparc/include/asm/jump_label.h
@@ -0,0 +1,32 @@
+#ifndef _ASM_SPARC_JUMP_LABEL_H
+#define _ASM_SPARC_JUMP_LABEL_H
+
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+#include <asm/system.h>
+
+#define JUMP_LABEL_NOP_SIZE 4
+
+#define JUMP_LABEL(key, label) \
+ do { \
+ asm goto("1:\n\t" \
+ "nop\n\t" \
+ "nop\n\t" \
+ ".pushsection __jump_table, \"a\"\n\t"\
+ ".word 1b, %l[" #label "], %c0\n\t" \
+ ".popsection \n\t" \
+ : : "i" (key) : : label);\
+ } while (0)
+
+#endif /* __KERNEL__ */
+
+typedef u32 jump_label_t;
+
+struct jump_entry {
+ jump_label_t code;
+ jump_label_t target;
+ jump_label_t key;
+};
+
+#endif
diff --git a/arch/sparc/kernel/Makefile b/arch/sparc/kernel/Makefile
index 0c2dc1f..599398f 100644
--- a/arch/sparc/kernel/Makefile
+++ b/arch/sparc/kernel/Makefile
@@ -119,3 +119,5 @@ obj-$(CONFIG_COMPAT) += $(audit--y)
pc--$(CONFIG_PERF_EVENTS) := perf_event.o
obj-$(CONFIG_SPARC64) += $(pc--y)
+
+obj-$(CONFIG_SPARC64) += jump_label.o
diff --git a/arch/sparc/kernel/jump_label.c b/arch/sparc/kernel/jump_label.c
new file mode 100644
index 0000000..00b3fcb
--- /dev/null
+++ b/arch/sparc/kernel/jump_label.c
@@ -0,0 +1,46 @@
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <linux/cpu.h>
+
+#include <linux/jump_label.h>
+#include <linux/memory.h>
+
+#ifdef HAVE_JUMP_LABEL
+
+void arch_jump_label_transform(struct jump_entry *entry, enum jump_label_type type)
+{
+ u32 val;
+ u32 *insn = (u32 *) (unsigned long) entry->code;
+
+ if (type == JUMP_LABEL_ENABLE) {
+ s32 off = (s32)entry->target - (s32)entry->code;
+
+#ifdef CONFIG_SPARC64
+ /* ba,pt %xcc, . + (off << 2) */
+ val = 0x10680000 | ((u32) off >> 2);
+#else
+ /* ba . + (off << 2) */
+ val = 0x10800000 | ((u32) off >> 2);
+#endif
+ } else {
+ val = 0x01000000;
+ }
+
+ get_online_cpus();
+ mutex_lock(&text_mutex);
+ *insn = val;
+ flushi(insn);
+ mutex_unlock(&text_mutex);
+ put_online_cpus();
+}
+
+void arch_jump_label_text_poke_early(jump_label_t addr)
+{
+ u32 *insn_p = (u32 *) (unsigned long) addr;
+
+ *insn_p = 0x01000000;
+ flushi(insn_p);
+}
+
+#endif
diff --git a/arch/sparc/kernel/module.c b/arch/sparc/kernel/module.c
index f848aad..ee3c7dd 100644
--- a/arch/sparc/kernel/module.c
+++ b/arch/sparc/kernel/module.c
@@ -18,6 +18,9 @@
#include <asm/spitfire.h>
#ifdef CONFIG_SPARC64
+
+#include <linux/jump_label.h>
+
static void *module_map(unsigned long size)
{
struct vm_struct *area;
@@ -227,6 +230,9 @@ int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs,
struct module *me)
{
+ /* make jump label nops */
+ jump_label_apply_nops(me);
+
/* Cheetah's I-cache is fully coherent. */
if (tlb_type == spitfire) {
unsigned long va;
--
1.6.6.1
--
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