xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Tükrözés 0
Kód Hibajegyek Egyesítési kérések Actions Packages Projektek Kiadások Wiki Tevékenység

ARM: 8031/2: change fixmap mapping region to support 32 CPUs

Forráskód böngészése 
In 32-bit ARM systems, the fixmap mapping region can support no more
than 14 CPUs(total: 896k; one CPU: 64K). And we can configure NR_CPUS
up to 32. So there is a mismatch.

This patch moves fixmapping region downwards to region 0xffc00000-
0xffe00000. Then the fixmap mapping region can support up to 32 CPUs.

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 09:43:32 +01:00
committed by Russell King
szülő 4221e2e6b3
commit a05e54c103
5 fájl változott, egészen pontosan 29 új sor hozzáadva és 21 régi sor törölve
Download Patch File Download Diff File Expand all files Collapse all files

27
arch/arm/mm/highmem.c
Fájl megtekintése

@@ -18,6 +18,21 @@
#include <asm/tlbflush.h>
#include "mm.h"
pte_t *fixmap_page_table;
static inline void set_fixmap_pte(int idx, pte_t pte)
{
unsigned long vaddr = __fix_to_virt(idx);
set_pte_ext(fixmap_page_table + idx, pte, 0);
local_flush_tlb_kernel_page(vaddr);
}
static inline pte_t get_fixmap_pte(unsigned long vaddr)
{
unsigned long idx = __virt_to_fix(vaddr);
return *(fixmap_page_table + idx);
}
void *kmap(struct page *page)
{
might_sleep();
@@ -69,14 +84,14 @@ void *kmap_atomic(struct page *page)
* With debugging enabled, kunmap_atomic forces that entry to 0.
* Make sure it was indeed properly unmapped.
*/
BUG_ON(!pte_none(get_top_pte(vaddr)));
BUG_ON(!pte_none(*(fixmap_page_table + idx)));
#endif
/*
* When debugging is off, kunmap_atomic leaves the previous mapping
* in place, so the contained TLB flush ensures the TLB is updated
* with the new mapping.
*/
set_top_pte(vaddr, mk_pte(page, kmap_prot));
set_fixmap_pte(idx, mk_pte(page, kmap_prot));
return (void *)vaddr;
}
@@ -95,7 +110,7 @@ void __kunmap_atomic(void *kvaddr)
__cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE);
#ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(vaddr != __fix_to_virt(idx));
set_top_pte(vaddr, __pte(0));
set_fixmap_pte(idx, __pte(0));
#else
(void) idx; /* to kill a warning */
#endif
@@ -119,9 +134,9 @@ void *kmap_atomic_pfn(unsigned long pfn)
idx = type + KM_TYPE_NR * smp_processor_id();
vaddr = __fix_to_virt(idx);
#ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(!pte_none(get_top_pte(vaddr)));
BUG_ON(!pte_none(*(fixmap_page_table + idx)));
#endif
set_top_pte(vaddr, pfn_pte(pfn, kmap_prot));
set_fixmap_pte(idx, pfn_pte(pfn, kmap_prot));
return (void *)vaddr;
}
@@ -133,5 +148,5 @@ struct page *kmap_atomic_to_page(const void *ptr)
if (vaddr < FIXADDR_START)
return virt_to_page(ptr);
return pte_page(get_top_pte(vaddr));
return pte_page(get_fixmap_pte(vaddr));
}