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

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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: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Liu Hua <sdu.liu@huawei.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Liu Hua 2014-04-18 09:27:01 +01:00 • committed by Russell King
parent 16c79a3776
commit 4221e2e6b3
2 changed files with 5 additions and 6 deletions
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5
arch/arm/include/asm/fixmap.h
View file

@ -17,8 +17,7 @@
#define FIXADDR_TOP 0xfffe0000UL #define FIXADDR_TOP 0xfffe0000UL
#define FIXADDR_SIZE (FIXADDR_TOP - FIXADDR_START) #define FIXADDR_SIZE (FIXADDR_TOP - FIXADDR_START)
#define FIX_KMAP_BEGIN 0 #define FIX_KMAP_NR_PTES (FIXADDR_SIZE >> PAGE_SHIFT)
#define FIX_KMAP_END (FIXADDR_SIZE >> PAGE_SHIFT)
#define __fix_to_virt(x) (FIXADDR_START + ((x) << PAGE_SHIFT)) #define __fix_to_virt(x) (FIXADDR_START + ((x) << PAGE_SHIFT))
#define __virt_to_fix(x) (((x) - FIXADDR_START) >> 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) 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(); __this_fixmap_does_not_exist();
return __fix_to_virt(idx); return __fix_to_virt(idx);
} }

6
arch/arm/mm/highmem.c
View file

@ -63,7 +63,7 @@ void *kmap_atomic(struct page *page)
type = kmap_atomic_idx_push(); type = kmap_atomic_idx_push();
idx = type + KM_TYPE_NR * smp_processor_id(); 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 #ifdef CONFIG_DEBUG_HIGHMEM
/* /*
* With debugging enabled, kunmap_atomic forces that entry to 0. * With debugging enabled, kunmap_atomic forces that entry to 0.
@ -94,7 +94,7 @@ void __kunmap_atomic(void *kvaddr)
if (cache_is_vivt()) if (cache_is_vivt())
__cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE); __cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE);
#ifdef CONFIG_DEBUG_HIGHMEM #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)); set_top_pte(vaddr, __pte(0));
#else #else
(void) idx; /* to kill a warning */ (void) idx; /* to kill a warning */
@ -117,7 +117,7 @@ void *kmap_atomic_pfn(unsigned long pfn)
type = kmap_atomic_idx_push(); type = kmap_atomic_idx_push();
idx = type + KM_TYPE_NR * smp_processor_id(); 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 #ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(!pte_none(get_top_pte(vaddr))); BUG_ON(!pte_none(get_top_pte(vaddr)));
#endif #endif