mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-05-24 10:39:52 +00:00
01c4b788e0
Patch series "Remove duplicated kmap code", v3. The kmap infrastructure has been copied almost verbatim to every architecture. This series consolidates obvious duplicated code by defining core functions which call into the architectures only when needed. Some of the k[un]map_atomic() implementations have some similarities but the similarities were not sufficient to warrant further changes. In addition we remove a duplicate implementation of kmap() in DRM. This patch (of 15): Replace the use of BUG_ON(in_interrupt()) in the kmap() and kunmap() in favor of might_sleep(). Besides the benefits of might_sleep(), this normalizes the implementations such that they can be made generic in subsequent patches. Signed-off-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christian König <christian.koenig@amd.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Helge Deller <deller@gmx.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Chris Zankel <chris@zankel.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Link: http://lkml.kernel.org/r/20200507150004.1423069-1-ira.weiny@intel.com Link: http://lkml.kernel.org/r/20200507150004.1423069-2-ira.weiny@intel.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com)
|
|
*/
|
|
|
|
#ifndef _ASM_HIGHMEM_H
|
|
#define _ASM_HIGHMEM_H
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
|
|
#include <uapi/asm/page.h>
|
|
#include <asm/kmap_types.h>
|
|
|
|
/* start after vmalloc area */
|
|
#define FIXMAP_BASE (PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE)
|
|
#define FIXMAP_SIZE PGDIR_SIZE /* only 1 PGD worth */
|
|
#define KM_TYPE_NR ((FIXMAP_SIZE >> PAGE_SHIFT)/NR_CPUS)
|
|
#define FIXMAP_ADDR(nr) (FIXMAP_BASE + ((nr) << PAGE_SHIFT))
|
|
|
|
/* start after fixmap area */
|
|
#define PKMAP_BASE (FIXMAP_BASE + FIXMAP_SIZE)
|
|
#define PKMAP_SIZE PGDIR_SIZE
|
|
#define LAST_PKMAP (PKMAP_SIZE >> PAGE_SHIFT)
|
|
#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
|
|
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
|
|
#define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT)
|
|
|
|
#define kmap_prot PAGE_KERNEL
|
|
|
|
|
|
#include <asm/cacheflush.h>
|
|
|
|
extern void *kmap(struct page *page);
|
|
extern void *kmap_high(struct page *page);
|
|
extern void *kmap_atomic(struct page *page);
|
|
extern void __kunmap_atomic(void *kvaddr);
|
|
extern void kunmap_high(struct page *page);
|
|
|
|
extern void kmap_init(void);
|
|
|
|
static inline void flush_cache_kmaps(void)
|
|
{
|
|
flush_cache_all();
|
|
}
|
|
|
|
static inline void kunmap(struct page *page)
|
|
{
|
|
might_sleep();
|
|
if (!PageHighMem(page))
|
|
return;
|
|
kunmap_high(page);
|
|
}
|
|
|
|
|
|
#endif
|
|
|
|
#endif
|