mirror of
https://github.com/torvalds/linux.git
synced 2024-12-04 01:51:34 +00:00
3e4d3af501
Keep the current interface but ignore the KM_type and use a stack based approach. The advantage is that we get rid of crappy code like: #define __KM_PTE \ (in_nmi() ? KM_NMI_PTE : \ in_irq() ? KM_IRQ_PTE : \ KM_PTE0) and in general can stop worrying about what context we're in and what kmap slots might be appropriate for that. The downside is that FRV kmap_atomic() gets more expensive. For now we use a CPP trick suggested by Andrew: #define kmap_atomic(page, args...) __kmap_atomic(page) to avoid having to touch all kmap_atomic() users in a single patch. [ not compiled on: - mn10300: the arch doesn't actually build with highmem to begin with ] [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: fix up drivers/gpu/drm/i915/intel_overlay.c] Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Chris Metcalf <cmetcalf@tilera.com> Cc: David Howells <dhowells@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: David Miller <davem@davemloft.net> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Dave Airlie <airlied@linux.ie> Cc: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
#ifndef _ASM_HIGHMEM_H
|
|
#define _ASM_HIGHMEM_H
|
|
|
|
#include <asm/kmap_types.h>
|
|
|
|
#define PKMAP_BASE (PAGE_OFFSET - PMD_SIZE)
|
|
#define LAST_PKMAP PTRS_PER_PTE
|
|
#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
|
|
#define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT)
|
|
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
|
|
|
|
#define kmap_prot PAGE_KERNEL
|
|
|
|
#define flush_cache_kmaps() \
|
|
do { \
|
|
if (cache_is_vivt()) \
|
|
flush_cache_all(); \
|
|
} while (0)
|
|
|
|
extern pte_t *pkmap_page_table;
|
|
|
|
#define ARCH_NEEDS_KMAP_HIGH_GET
|
|
|
|
extern void *kmap_high(struct page *page);
|
|
extern void *kmap_high_get(struct page *page);
|
|
extern void kunmap_high(struct page *page);
|
|
|
|
extern void *kmap_high_l1_vipt(struct page *page, pte_t *saved_pte);
|
|
extern void kunmap_high_l1_vipt(struct page *page, pte_t saved_pte);
|
|
|
|
/*
|
|
* The following functions are already defined by <linux/highmem.h>
|
|
* when CONFIG_HIGHMEM is not set.
|
|
*/
|
|
#ifdef CONFIG_HIGHMEM
|
|
extern void *kmap(struct page *page);
|
|
extern void kunmap(struct page *page);
|
|
extern void *__kmap_atomic(struct page *page);
|
|
extern void __kunmap_atomic(void *kvaddr);
|
|
extern void *kmap_atomic_pfn(unsigned long pfn);
|
|
extern struct page *kmap_atomic_to_page(const void *ptr);
|
|
#endif
|
|
|
|
#endif
|