|
|
|
/*
|
|
|
|
* Re-map IO memory to kernel address space so that we can access it.
|
|
|
|
* This is needed for high PCI addresses that aren't mapped in the
|
|
|
|
* 640k-1MB IO memory area on PC's
|
|
|
|
*
|
|
|
|
* (C) Copyright 1995 1996 Linus Torvalds
|
|
|
|
*/
|
|
|
|
#include <linux/vmalloc.h>
|
|
|
|
#include <linux/mm.h>
|
Detach sched.h from mm.h
First thing mm.h does is including sched.h solely for can_do_mlock() inline
function which has "current" dereference inside. By dealing with can_do_mlock()
mm.h can be detached from sched.h which is good. See below, why.
This patch
a) removes unconditional inclusion of sched.h from mm.h
b) makes can_do_mlock() normal function in mm/mlock.c
c) exports can_do_mlock() to not break compilation
d) adds sched.h inclusions back to files that were getting it indirectly.
e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
getting them indirectly
Net result is:
a) mm.h users would get less code to open, read, preprocess, parse, ... if
they don't need sched.h
b) sched.h stops being dependency for significant number of files:
on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
after patch it's only 3744 (-8.3%).
Cross-compile tested on
all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
alpha alpha-up
arm
i386 i386-up i386-defconfig i386-allnoconfig
ia64 ia64-up
m68k
mips
parisc parisc-up
powerpc powerpc-up
s390 s390-up
sparc sparc-up
sparc64 sparc64-up
um-x86_64
x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig
as well as my two usual configs.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
18 years ago
|
|
|
#include <linux/sched.h>
|
|
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
|
|
#include <asm/pgtable.h>
|
|
|
|
|
|
|
|
static int ioremap_pte_range(pmd_t *pmd, unsigned long addr,
|
|
|
|
unsigned long end, unsigned long phys_addr, pgprot_t prot)
|
|
|
|
{
|
|
|
|
pte_t *pte;
|
|
|
|
unsigned long pfn;
|
|
|
|
|
|
|
|
pfn = phys_addr >> PAGE_SHIFT;
|
|
|
|
pte = pte_alloc_kernel(pmd, addr);
|
|
|
|
if (!pte)
|
|
|
|
return -ENOMEM;
|
|
|
|
do {
|
|
|
|
BUG_ON(!pte_none(*pte));
|
|
|
|
set_pte_at(&init_mm, addr, pte, pfn_pte(pfn, prot));
|
|
|
|
pfn++;
|
|
|
|
} while (pte++, addr += PAGE_SIZE, addr != end);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr,
|
|
|
|
unsigned long end, unsigned long phys_addr, pgprot_t prot)
|
|
|
|
{
|
|
|
|
pmd_t *pmd;
|
|
|
|
unsigned long next;
|
|
|
|
|
|
|
|
phys_addr -= addr;
|
|
|
|
pmd = pmd_alloc(&init_mm, pud, addr);
|
|
|
|
if (!pmd)
|
|
|
|
return -ENOMEM;
|
|
|
|
do {
|
|
|
|
next = pmd_addr_end(addr, end);
|
|
|
|
if (ioremap_pte_range(pmd, addr, next, phys_addr + addr, prot))
|
|
|
|
return -ENOMEM;
|
|
|
|
} while (pmd++, addr = next, addr != end);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int ioremap_pud_range(pgd_t *pgd, unsigned long addr,
|
|
|
|
unsigned long end, unsigned long phys_addr, pgprot_t prot)
|
|
|
|
{
|
|
|
|
pud_t *pud;
|
|
|
|
unsigned long next;
|
|
|
|
|
|
|
|
phys_addr -= addr;
|
|
|
|
pud = pud_alloc(&init_mm, pgd, addr);
|
|
|
|
if (!pud)
|
|
|
|
return -ENOMEM;
|
|
|
|
do {
|
|
|
|
next = pud_addr_end(addr, end);
|
|
|
|
if (ioremap_pmd_range(pud, addr, next, phys_addr + addr, prot))
|
|
|
|
return -ENOMEM;
|
|
|
|
} while (pud++, addr = next, addr != end);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int ioremap_page_range(unsigned long addr,
|
|
|
|
unsigned long end, unsigned long phys_addr, pgprot_t prot)
|
|
|
|
{
|
|
|
|
pgd_t *pgd;
|
|
|
|
unsigned long start;
|
|
|
|
unsigned long next;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
BUG_ON(addr >= end);
|
|
|
|
|
|
|
|
start = addr;
|
|
|
|
phys_addr -= addr;
|
|
|
|
pgd = pgd_offset_k(addr);
|
|
|
|
do {
|
|
|
|
next = pgd_addr_end(addr, end);
|
|
|
|
err = ioremap_pud_range(pgd, addr, next, phys_addr+addr, prot);
|
|
|
|
if (err)
|
|
|
|
break;
|
|
|
|
} while (pgd++, addr = next, addr != end);
|
|
|
|
|
|
|
|
flush_cache_vmap(start, end);
|
|
|
|
|
|
|
|
return err;
|
|
|
|
}
|