The patch titled
Immediate Value: PowerPC Optimization
has been removed from the -mm tree. Its filename was
immediate-value-powerpc-optimization.patch
This patch was dropped because it had testing failures
------------------------------------------------------
Subject: Immediate Value: PowerPC Optimization
From: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
PowerPC optimization of the immediate values which uses a li instruction,
patched with an immediate value 0 or 1 to set the immediate value.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/kernel/Makefile | 1
arch/powerpc/kernel/immediate.c | 29 ++++++++++++
include/asm-powerpc/immediate.h | 69 +++++++++++++++++++++++++++++-
3 files changed, 98 insertions(+), 1 deletion(-)
diff -puN arch/powerpc/kernel/Makefile~immediate-value-powerpc-optimization arch/powerpc/kernel/Makefile
--- a/arch/powerpc/kernel/Makefile~immediate-value-powerpc-optimization
+++ a/arch/powerpc/kernel/Makefile
@@ -103,3 +103,4 @@ obj-$(CONFIG_PPC64) += $(obj64-y)
extra-$(CONFIG_PPC_FPU) += fpu.o
extra-$(CONFIG_PPC64) += entry_64.o
+obj-$(CONFIG_IMMEDIATE) += immediate.o
diff -puN /dev/null arch/powerpc/kernel/immediate.c
--- /dev/null
+++ a/arch/powerpc/kernel/immediate.c
@@ -0,0 +1,29 @@
+/*
+ * Powerpc optimized immediate values enabling/disabling.
+ *
+ * Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
+ */
+
+#include <linux/module.h>
+#include <linux/immediate.h>
+#include <linux/string.h>
+#include <asm/cacheflush.h>
+#include <asm/page.h>
+
+/*
+ * The address is aligned on 4 bytes boundary: the 4 bytes instruction we are
+ * changing fits within one page.
+ */
+int immediate_optimized_set_enable(void *address, char enable)
+{
+ char newi[IMMEDIATE_OPTIMIZED_ENABLE_IMMEDIATE_OFFSET+1];
+ int size = IMMEDIATE_OPTIMIZED_ENABLE_IMMEDIATE_OFFSET
+ + sizeof(IMMEDIATE_OPTIMIZED_ENABLE_TYPE);
+
+ memcpy(newi, address, size);
+ IMMEDIATE_OPTIMIZED_ENABLE(&newi[0]) = enable;
+ memcpy(address, newi, size);
+ flush_icache_range((unsigned long)address, size);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(immediate_optimized_set_enable);
diff -puN include/asm-powerpc/immediate.h~immediate-value-powerpc-optimization include/asm-powerpc/immediate.h
--- a/include/asm-powerpc/immediate.h~immediate-value-powerpc-optimization
+++ a/include/asm-powerpc/immediate.h
@@ -1 +1,68 @@
-#include <asm-generic/immediate.h>
+#ifndef _ASM_POWERPC_IMMEDIATE_H
+#define _ASM_POWERPC_IMMEDIATE_H
+
+/*
+ * Immediate values. PowerPC architecture optimizations.
+ *
+ * (C) Copyright 2006 Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
+#include <asm/asm-compat.h>
+
+#define IF_DEFAULT (IF_OPTIMIZED | IF_LOCKDEP)
+
+/* Optimized version of the immediate */
+#define immediate_optimized(flags, var) \
+ ({ \
+ char condition; \
+ asm ( ".section __immediate, \"a\", @progbits;\n\t" \
+ PPC_LONG "%1, 0f, %2;\n\t" \
+ ".previous;\n\t" \
+ ".align 4\n\t" \
+ "0:\n\t" \
+ "li %0,%3;\n\t" \
+ : "=r" (condition) \
+ : "i" (&var), \
+ "i" (flags), \
+ "i" (0)); \
+ condition; \
+ })
+
+/*
+ * immediate macro selecting the generic or optimized version of immediate,
+ * depending on the flags specified. It is a macro because we need to pass the
+ * name to immediate_optimized() and immediate_generic() so they can declare a
+ * static variable with it.
+ */
+#define _immediate(flags, var) \
+({ \
+ ((flags) & IF_OPTIMIZED) ? \
+ immediate_optimized(flags, var) : \
+ immediate_generic(flags, var); \
+})
+
+/* immediate with default behavior */
+#define immediate(var) _immediate(IF_DEFAULT, var)
+
+/*
+ * Architecture dependant immediate information, used internally for immediate
+ * activation.
+ */
+
+/*
+ * Offset of the immediate value from the start of the addi instruction (result
+ * of the li mnemonic), in bytes.
+ */
+#define IMMEDIATE_OPTIMIZED_ENABLE_IMMEDIATE_OFFSET 2
+#define IMMEDIATE_OPTIMIZED_ENABLE_TYPE unsigned short
+/* Dereference enable as lvalue from a pointer to its instruction */
+#define IMMEDIATE_OPTIMIZED_ENABLE(a) \
+ (*(IMMEDIATE_OPTIMIZED_ENABLE_TYPE*) \
+ ((char*)(a)+IMMEDIATE_OPTIMIZED_ENABLE_IMMEDIATE_OFFSET))
+
+extern int immediate_optimized_set_enable(void *address, char enable);
+
+#endif /* _ASM_POWERPC_IMMEDIATE_H */
_
Patches currently in -mm which might be from mathieu.desnoyers@xxxxxxxxxx are
powerpc-promc-remove-undef-printk.patch
immediate-value-powerpc-optimization.patch
immediate-value-documentation.patch
f00f-bug-fixup-for-i386-use-immediate-values.patch
scheduler-profiling-use-immediate-values.patch
scheduler-profiling-use-immediate-values-fix.patch
cxgb3-vs-immediate-stuff.patch
use-data_data-in-cris.patch
add-missing-data_data-in-powerpc.patch
use-data_data-in-xtensa.patch
linux-kernel-markers-architecture-independent-code.patch
linux-kernel-markers-add-kconfig-menus-for-the-marker-code.patch
linux-kernel-markers-documentation.patch
port-of-blktrace-to-the-linux-kernel-markers.patch
port-of-blktrace-to-the-linux-kernel-markers-fix.patch
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