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Commit 4221e2e6 authored by Liu Hua's avatar Liu Hua Committed by Russell King
Browse files

ARM: 8031/1: fixmap: remove FIX_KMAP_BEGIN and FIX_KMAP_END 



It seems that these two macros are not used by non architecture
specific code. And on ARM FIX_KMAP_BEGIN equals zero.

This patch removes these two macros. Instead, using FIX_KMAP_NR_PTES to
tell the pte number belonged to fixmap mapping region. The code will
become clearer when I introduce a bugfix on fixmap mapping region.

Reviewed-by: default avatarNicolas Pitre <nico@linaro.org>
Signed-off-by: default avatarLiu Hua <sdu.liu@huawei.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 16c79a37

arch/arm/include/asm/fixmap.h

+2 −3
Original line number Diff line number Diff line
@@ -17,8 +17,7 @@ 
#define FIXADDR_TOP		0xfffe0000UL

#define FIXADDR_SIZE		(FIXADDR_TOP - FIXADDR_START)



#define FIX_KMAP_BEGIN		0

#define FIX_KMAP_END		(FIXADDR_SIZE >> PAGE_SHIFT)

#define FIX_KMAP_NR_PTES	(FIXADDR_SIZE >> PAGE_SHIFT)



#define __fix_to_virt(x)	(FIXADDR_START + ((x) << PAGE_SHIFT))

#define __virt_to_fix(x)	(((x) - FIXADDR_START) >> PAGE_SHIFT)
@@ -27,7 +26,7 @@ extern void __this_fixmap_does_not_exist(void); 


static inline unsigned long fix_to_virt(const unsigned int idx)

{

	if (idx >= FIX_KMAP_END)

	if (idx >= FIX_KMAP_NR_PTES)

		__this_fixmap_does_not_exist();

	return __fix_to_virt(idx);

}

arch/arm/mm/highmem.c

+3 −3
Original line number Diff line number Diff line
@@ -63,7 +63,7 @@ void *kmap_atomic(struct page *page) 
	type = kmap_atomic_idx_push();



	idx = type + KM_TYPE_NR * smp_processor_id();

	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);

	vaddr = __fix_to_virt(idx);

#ifdef CONFIG_DEBUG_HIGHMEM

	/*

	 * With debugging enabled, kunmap_atomic forces that entry to 0.
@@ -94,7 +94,7 @@ void __kunmap_atomic(void *kvaddr) 
		if (cache_is_vivt())

			__cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE);

#ifdef CONFIG_DEBUG_HIGHMEM

		BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));

		BUG_ON(vaddr != __fix_to_virt(idx));

		set_top_pte(vaddr, __pte(0));

#else

		(void) idx;  /* to kill a warning */
@@ -117,7 +117,7 @@ void *kmap_atomic_pfn(unsigned long pfn) 


	type = kmap_atomic_idx_push();

	idx = type + KM_TYPE_NR * smp_processor_id();

	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);

	vaddr = __fix_to_virt(idx);

#ifdef CONFIG_DEBUG_HIGHMEM

	BUG_ON(!pte_none(get_top_pte(vaddr)));

#endif