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arch/kmap: remove redundant arch specific kmaps 

The kmap code for all the architectures is almost 100% identical.

Lift the common code to the core.  Use ARCH_HAS_KMAP_FLUSH_TLB to indicate
if an arch defines kmap_flush_tlb() and call if if needed.

This also has the benefit of changing kmap() on a number of architectures
to be an inline call rather than an actual function.

Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christian König <christian.koenig@amd.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Helge Deller <deller@gmx.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20200507150004.1423069-4-ira.weiny@intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ira Weiny 2020-06-04 16:47:30 -07:00 committed by Linus Torvalds
parent 2159687248
commit 525aaf9bad
17 changed files with 29 additions and 109 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arc/include/asm/highmem.h
View File

@ -30,8 +30,6 @@
#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);

10
arch/arc/mm/highmem.c
View File

@ -49,16 +49,6 @@
extern pte_t * pkmap_page_table;
static pte_t * fixmap_page_table;
void *kmap(struct page *page)
{
might_sleep();
if (!PageHighMem(page))
return page_address(page);
return kmap_high(page);
}
EXPORT_SYMBOL(kmap);
void *kmap_atomic(struct page *page)
{
int idx, cpu_idx;

2
arch/arm/include/asm/highmem.h
View File

@ -20,7 +20,6 @@
extern pte_t *pkmap_page_table;
extern void *kmap_high(struct page *page);
extern void kunmap_high(struct page *page);
/*
@ -63,7 +62,6 @@ static inline void *kmap_high_get(struct page *page)
* 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);

9
arch/arm/mm/highmem.c
View File

@ -31,15 +31,6 @@ static inline pte_t get_fixmap_pte(unsigned long vaddr)
return *ptep;
}
void *kmap(struct page *page)
{
might_sleep();
if (!PageHighMem(page))
return page_address(page);
return kmap_high(page);
}
EXPORT_SYMBOL(kmap);
void kunmap(struct page *page)
{
might_sleep();

4
arch/csky/include/asm/highmem.h
View File

@ -30,10 +30,10 @@ extern pte_t *pkmap_page_table;
#define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
extern void *kmap_high(struct page *page);
extern void kunmap_high(struct page *page);
extern void *kmap(struct page *page);
#define ARCH_HAS_KMAP_FLUSH_TLB
extern void kmap_flush_tlb(unsigned long addr);
extern void kunmap(struct page *page);
extern void *kmap_atomic(struct page *page);
extern void __kunmap_atomic(void *kvaddr);

14
arch/csky/mm/highmem.c
View File

@ -13,18 +13,12 @@ static pte_t *kmap_pte;
unsigned long highstart_pfn, highend_pfn;
void *kmap(struct page *page)
void kmap_flush_tlb(unsigned long addr)
{
void *addr;
might_sleep();
if (!PageHighMem(page))
return page_address(page);
addr = kmap_high(page);
flush_tlb_one((unsigned long)addr);
return addr;
flush_tlb_one(addr);
}
EXPORT_SYMBOL(kmap_flush_tlb);
EXPORT_SYMBOL(kmap);
void kunmap(struct page *page)

9
arch/microblaze/include/asm/highmem.h
View File

@ -51,19 +51,10 @@ extern pte_t *pkmap_page_table;
#define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
extern void *kmap_high(struct page *page);
extern void kunmap_high(struct page *page);
extern void *kmap_atomic_prot(struct page *page, pgprot_t prot);
extern void __kunmap_atomic(void *kvaddr);
static inline void *kmap(struct page *page)
{
might_sleep();
if (!PageHighMem(page))
return page_address(page);
return kmap_high(page);
}
static inline void kunmap(struct page *page)
{
might_sleep();

4
arch/mips/include/asm/highmem.h
View File

@ -46,10 +46,10 @@ extern pte_t *pkmap_page_table;
#define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
extern void * kmap_high(struct page *page);
extern void kunmap_high(struct page *page);
extern void *kmap(struct page *page);
#define ARCH_HAS_KMAP_FLUSH_TLB
extern void kmap_flush_tlb(unsigned long addr);
extern void kunmap(struct page *page);
extern void *kmap_atomic(struct page *page);
extern void __kunmap_atomic(void *kvaddr);

14
arch/mips/mm/highmem.c
View File

@ -12,19 +12,11 @@ static pte_t *kmap_pte;
unsigned long highstart_pfn, highend_pfn;
void *kmap(struct page *page)
void kmap_flush_tlb(unsigned long addr)
{
void *addr;
might_sleep();
if (!PageHighMem(page))
return page_address(page);
addr = kmap_high(page);
flush_tlb_one((unsigned long)addr);
return addr;
flush_tlb_one(addr);
}
EXPORT_SYMBOL(kmap);
EXPORT_SYMBOL(kmap_flush_tlb);
void kunmap(struct page *page)
{

2
arch/nds32/include/asm/highmem.h
View File

@ -44,7 +44,6 @@ extern unsigned long highstart_pfn, highend_pfn;
extern pte_t *pkmap_page_table;
extern void *kmap_high(struct page *page);
extern void kunmap_high(struct page *page);
extern void kmap_init(void);
@ -54,7 +53,6 @@ extern void kmap_init(void);
* 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);

12
arch/nds32/mm/highmem.c
View File

@ -10,18 +10,6 @@
#include <asm/fixmap.h>
#include <asm/tlbflush.h>
void *kmap(struct page *page)
{
unsigned long vaddr;
might_sleep();
if (!PageHighMem(page))
return page_address(page);
vaddr = (unsigned long)kmap_high(page);
return (void *)vaddr;
}
EXPORT_SYMBOL(kmap);
void kunmap(struct page *page)
{
might_sleep();

9
arch/powerpc/include/asm/highmem.h
View File

@ -59,19 +59,10 @@ extern pte_t *pkmap_page_table;
#define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
extern void *kmap_high(struct page *page);
extern void kunmap_high(struct page *page);
extern void *kmap_atomic_prot(struct page *page, pgprot_t prot);
extern void __kunmap_atomic(void *kvaddr);
static inline void *kmap(struct page *page)
{
might_sleep();
if (!PageHighMem(page))
return page_address(page);
return kmap_high(page);
}
static inline void kunmap(struct page *page)
{
might_sleep();

9
arch/sparc/include/asm/highmem.h
View File

@ -50,17 +50,8 @@ void kmap_init(void) __init;
#define PKMAP_END (PKMAP_ADDR(LAST_PKMAP))
void *kmap_high(struct page *page);
void kunmap_high(struct page *page);
static inline void *kmap(struct page *page)
{
might_sleep();
if (!PageHighMem(page))
return page_address(page);
return kmap_high(page);
}
static inline void kunmap(struct page *page)
{
might_sleep();

2
arch/x86/include/asm/highmem.h
View File

@ -58,10 +58,8 @@ extern unsigned long highstart_pfn, highend_pfn;
#define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
extern void *kmap_high(struct page *page);
extern void kunmap_high(struct page *page);
void *kmap(struct page *page);
void kunmap(struct page *page);
void *kmap_atomic_prot(struct page *page, pgprot_t prot);

9
arch/x86/mm/highmem_32.c
View File

@ -4,15 +4,6 @@
#include <linux/swap.h> /* for totalram_pages */
#include <linux/memblock.h>
void *kmap(struct page *page)
{
might_sleep();
if (!PageHighMem(page))
return page_address(page);
return kmap_high(page);
}
EXPORT_SYMBOL(kmap);
void kunmap(struct page *page)
{
might_sleep();

9
arch/xtensa/include/asm/highmem.h
View File

@ -63,17 +63,8 @@ static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color)
extern pte_t *pkmap_page_table;
void *kmap_high(struct page *page);
void kunmap_high(struct page *page);
static inline void *kmap(struct page *page)
{
might_sleep();
if (!PageHighMem(page))
return page_address(page);
return kmap_high(page);
}
static inline void kunmap(struct page *page)
{
might_sleep();

18
include/linux/highmem.h
View File

@ -34,6 +34,24 @@ static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
#ifdef CONFIG_HIGHMEM
#include <asm/highmem.h>
#ifndef ARCH_HAS_KMAP_FLUSH_TLB
static inline void kmap_flush_tlb(unsigned long addr) { }
#endif
void *kmap_high(struct page *page);
static inline void *kmap(struct page *page)
{
void *addr;
might_sleep();
if (!PageHighMem(page))
addr = page_address(page);
else
addr = kmap_high(page);
kmap_flush_tlb((unsigned long)addr);
return addr;
}
/* declarations for linux/mm/highmem.c */
unsigned int nr_free_highpages(void);
extern atomic_long_t _totalhigh_pages;