PowerPC optimization of the immediate values which uses a li instruction, patched with an immediate value. Changelog: - Put imv_set and _imv_set in the architecture independent header. - Pack the __imv section. Use smallest types required for size (char). - Remove architecture specific update code : now handled by architecture agnostic code. - Use imv_* instead of immediate_*. Signed-off-by: Mathieu Desnoyers CC: Rusty Russell CC: Christoph Hellwig CC: Paul Mackerras CC: Adrian Bunk CC: Andi Kleen CC: mingo@elte.hu CC: akpm@osdl.org --- arch/powerpc/Kconfig | 1 include/asm-powerpc/immediate.h | 55 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 56 insertions(+) Index: linux-2.6-lttng/include/asm-powerpc/immediate.h =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6-lttng/include/asm-powerpc/immediate.h 2008-03-06 08:55:54.000000000 -0500 @@ -0,0 +1,55 @@ +#ifndef _ASM_POWERPC_IMMEDIATE_H +#define _ASM_POWERPC_IMMEDIATE_H + +/* + * Immediate values. PowerPC architecture optimizations. + * + * (C) Copyright 2006 Mathieu Desnoyers + * + * This file is released under the GPLv2. + * See the file COPYING for more details. + */ + +#include + +/** + * imv_read - read immediate variable + * @name: immediate value name + * + * Reads the value of @name. + * Optimized version of the immediate. + * Do not use in __init and __exit functions. Use _imv_read() instead. + */ +#define imv_read(name) \ + ({ \ + __typeof__(name##__imv) value; \ + BUILD_BUG_ON(sizeof(value) > 8); \ + switch (sizeof(value)) { \ + case 1: \ + asm(".section __imv,\"a\",@progbits\n\t" \ + PPC_LONG "%c1, ((1f)-1)\n\t" \ + ".byte 1\n\t" \ + ".previous\n\t" \ + "li %0,0\n\t" \ + "1:\n\t" \ + : "=r" (value) \ + : "i" (&name##__imv)); \ + break; \ + case 2: \ + asm(".section __imv,\"a\",@progbits\n\t" \ + PPC_LONG "%c1, ((1f)-2)\n\t" \ + ".byte 2\n\t" \ + ".previous\n\t" \ + "li %0,0\n\t" \ + "1:\n\t" \ + : "=r" (value) \ + : "i" (&name##__imv)); \ + break; \ + case 4: \ + case 8: value = name##__imv; \ + break; \ + }; \ + value; \ + }) + +#endif /* _ASM_POWERPC_IMMEDIATE_H */ Index: linux-2.6-lttng/arch/powerpc/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/powerpc/Kconfig 2008-03-06 08:45:31.000000000 -0500 +++ linux-2.6-lttng/arch/powerpc/Kconfig 2008-03-06 08:56:14.000000000 -0500 @@ -91,6 +91,7 @@ config PPC select HAVE_OPROFILE select HAVE_KPROBES select HAVE_KRETPROBES + select HAVE_IMMEDIATE config EARLY_PRINTK bool -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/