sh: Provide a generic SRAM pool for tiny memories. (c993487e) · Commits · 戴 / test

arch/sh/include/asm/sram.h

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			#ifndef __ASM_SRAM_H
			#define __ASM_SRAM_H

			#ifdef CONFIG_HAVE_SRAM_POOL

			#include <linux/spinlock.h>
			#include <linux/genalloc.h>

			/* arch/sh/mm/sram.c */
			extern struct gen_pool *sram_pool;

			static inline unsigned long sram_alloc(size_t len)
			{
			if (!sram_pool)
			return 0UL;

			return gen_pool_alloc(sram_pool, len);
			}

			static inline void sram_free(unsigned long addr, size_t len)
			{
			return gen_pool_free(sram_pool, addr, len);
			}

			#else

			static inline unsigned long sram_alloc(size_t len)
			{
			return 0;
			}

			static inline void sram_free(unsigned long addr, size_t len)
			{
			}

			#endif /* CONFIG_HAVE_SRAM_POOL */

			#endif /* __ASM_SRAM_H */

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	@@ -40,6 +40,7 @@ obj-$(CONFIG_PMB) += pmb.o
	obj-$(CONFIG_NUMA) += numa.o		obj-$(CONFIG_NUMA) += numa.o
	obj-$(CONFIG_IOREMAP_FIXED) += ioremap_fixed.o		obj-$(CONFIG_IOREMAP_FIXED) += ioremap_fixed.o
	obj-$(CONFIG_UNCACHED_MAPPING) += uncached.o		obj-$(CONFIG_UNCACHED_MAPPING) += uncached.o
			obj-$(CONFIG_HAVE_SRAM_POOL) += sram.o

	# Special flags for fault_64.o. This puts restrictions on the number of		# Special flags for fault_64.o. This puts restrictions on the number of
	# caller-save registers that the compiler can target when building this file.		# caller-save registers that the compiler can target when building this file.

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			/*
			* SRAM pool for tiny memories not otherwise managed.
			*
			* Copyright (C) 2010 Paul Mundt
			*
			* This file is subject to the terms and conditions of the GNU General Public
			* License. See the file "COPYING" in the main directory of this archive
			* for more details.
			*/
			#include <linux/init.h>
			#include <linux/kernel.h>
			#include <asm/sram.h>

			/*
			* This provides a standard SRAM pool for tiny memories that can be
			* added either by the CPU or the platform code. Typical SRAM sizes
			* to be inserted in to the pool will generally be less than the page
			* size, with anything more reasonably sized handled as a NUMA memory
			* node.
			*/
			struct gen_pool *sram_pool;

			static int __init sram_pool_init(void)
			{
			/*
			* This is a global pool, we don't care about node locality.
			*/
			sram_pool = gen_pool_create(1, -1);
			if (unlikely(!sram_pool))
			return -ENOMEM;

			return 0;
			}
			core_initcall(sram_pool_init);