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Commit 88c58f3b authored by Russell King's avatar Russell King
Browse files

ARM: dma-mapping: move consistent_init into CONFIG_MMU section 



No point wrapping the contents of this function with #ifdef CONFIG_MMU
when we can place it and the core_initcall() entirely within the
existing conditional block.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Acked-by: default avatarGreg Ungerer <gerg@uclinux.org>
parent 695ae0af

arch/arm/mm/dma-mapping.c

+38 −40
Original line number Diff line number Diff line
@@ -144,6 +144,44 @@ static struct arm_vmregion_head consistent_head = { 
#error ARM Coherent DMA allocator does not (yet) support huge TLB

#endif



/*

 * Initialise the consistent memory allocation.

 */

static int __init consistent_init(void)

{

	int ret = 0;

	pgd_t *pgd;

	pmd_t *pmd;

	pte_t *pte;

	int i = 0;

	u32 base = CONSISTENT_BASE;



	do {

		pgd = pgd_offset(&init_mm, base);

		pmd = pmd_alloc(&init_mm, pgd, base);

		if (!pmd) {

			printk(KERN_ERR "%s: no pmd tables\n", __func__);

			ret = -ENOMEM;

			break;

		}

		WARN_ON(!pmd_none(*pmd));



		pte = pte_alloc_kernel(pmd, base);

		if (!pte) {

			printk(KERN_ERR "%s: no pte tables\n", __func__);

			ret = -ENOMEM;

			break;

		}



		consistent_pte[i++] = pte;

		base += (1 << PGDIR_SHIFT);

	} while (base < CONSISTENT_END);



	return ret;

}



core_initcall(consistent_init);



static void *

__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,

	    pgprot_t prot)
@@ -399,46 +437,6 @@ void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr 
}

EXPORT_SYMBOL(dma_free_coherent);



/*

 * Initialise the consistent memory allocation.

 */

static int __init consistent_init(void)

{

	int ret = 0;

#ifdef CONFIG_MMU

	pgd_t *pgd;

	pmd_t *pmd;

	pte_t *pte;

	int i = 0;

	u32 base = CONSISTENT_BASE;



	do {

		pgd = pgd_offset(&init_mm, base);

		pmd = pmd_alloc(&init_mm, pgd, base);

		if (!pmd) {

			printk(KERN_ERR "%s: no pmd tables\n", __func__);

			ret = -ENOMEM;

			break;

		}

		WARN_ON(!pmd_none(*pmd));



		pte = pte_alloc_kernel(pmd, base);

		if (!pte) {

			printk(KERN_ERR "%s: no pte tables\n", __func__);

			ret = -ENOMEM;

			break;

		}



		consistent_pte[i++] = pte;

		base += (1 << PGDIR_SHIFT);

	} while (base < CONSISTENT_END);

#endif	/* !CONFIG_MMU */



	return ret;

}



core_initcall(consistent_init);



/*

 * Make an area consistent for devices.

 * Note: Drivers should NOT use this function directly, as it will break