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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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39af22a792
Since commit3e4d3af501"mm: stack based kmap_atomic()", it is no longer necessary to carry an ad hoc version of kmap_atomic() added in commit7e5a69e83b"ARM: 6007/1: fix highmem with VIPT cache and DMA" to cope with reentrancy. In fact, it is now actively wrong to rely on fixed kmap type indices (namely KM_L1_CACHE) as kmap_atomic() totally ignores them now and a concurrent instance of it may reuse any slot for any purpose. Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
42 lines
1.0 KiB
C
42 lines
1.0 KiB
C
#ifndef _ASM_HIGHMEM_H
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#define _ASM_HIGHMEM_H
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#include <asm/kmap_types.h>
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#define PKMAP_BASE (PAGE_OFFSET - PMD_SIZE)
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#define LAST_PKMAP PTRS_PER_PTE
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#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
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#define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT)
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#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
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#define kmap_prot PAGE_KERNEL
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#define flush_cache_kmaps() \
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do { \
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if (cache_is_vivt()) \
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flush_cache_all(); \
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} while (0)
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extern pte_t *pkmap_page_table;
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#define ARCH_NEEDS_KMAP_HIGH_GET
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extern void *kmap_high(struct page *page);
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extern void *kmap_high_get(struct page *page);
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extern void kunmap_high(struct page *page);
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/*
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* The following functions are already defined by <linux/highmem.h>
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* when CONFIG_HIGHMEM is not set.
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*/
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#ifdef CONFIG_HIGHMEM
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extern void *kmap(struct page *page);
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extern void kunmap(struct page *page);
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extern void *__kmap_atomic(struct page *page);
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extern void __kunmap_atomic(void *kvaddr);
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extern void *kmap_atomic_pfn(unsigned long pfn);
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extern struct page *kmap_atomic_to_page(const void *ptr);
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#endif
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#endif
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