e8edc6e03a
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>
91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
/*
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* Re-map IO memory to kernel address space so that we can access it.
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* This is needed for high PCI addresses that aren't mapped in the
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* 640k-1MB IO memory area on PC's
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*
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* (C) Copyright 1995 1996 Linus Torvalds
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*/
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <asm/cacheflush.h>
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#include <asm/pgtable.h>
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static int ioremap_pte_range(pmd_t *pmd, unsigned long addr,
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unsigned long end, unsigned long phys_addr, pgprot_t prot)
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{
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pte_t *pte;
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unsigned long pfn;
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pfn = phys_addr >> PAGE_SHIFT;
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pte = pte_alloc_kernel(pmd, addr);
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if (!pte)
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return -ENOMEM;
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do {
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BUG_ON(!pte_none(*pte));
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set_pte_at(&init_mm, addr, pte, pfn_pte(pfn, prot));
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pfn++;
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} while (pte++, addr += PAGE_SIZE, addr != end);
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return 0;
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}
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static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr,
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unsigned long end, unsigned long phys_addr, pgprot_t prot)
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{
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pmd_t *pmd;
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unsigned long next;
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phys_addr -= addr;
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pmd = pmd_alloc(&init_mm, pud, addr);
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if (!pmd)
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return -ENOMEM;
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do {
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next = pmd_addr_end(addr, end);
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if (ioremap_pte_range(pmd, addr, next, phys_addr + addr, prot))
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return -ENOMEM;
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} while (pmd++, addr = next, addr != end);
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return 0;
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}
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static inline int ioremap_pud_range(pgd_t *pgd, unsigned long addr,
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unsigned long end, unsigned long phys_addr, pgprot_t prot)
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{
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pud_t *pud;
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unsigned long next;
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phys_addr -= addr;
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pud = pud_alloc(&init_mm, pgd, addr);
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if (!pud)
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return -ENOMEM;
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do {
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next = pud_addr_end(addr, end);
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if (ioremap_pmd_range(pud, addr, next, phys_addr + addr, prot))
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return -ENOMEM;
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} while (pud++, addr = next, addr != end);
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return 0;
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}
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int ioremap_page_range(unsigned long addr,
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unsigned long end, unsigned long phys_addr, pgprot_t prot)
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{
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pgd_t *pgd;
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unsigned long start;
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unsigned long next;
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int err;
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BUG_ON(addr >= end);
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start = addr;
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phys_addr -= addr;
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pgd = pgd_offset_k(addr);
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do {
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next = pgd_addr_end(addr, end);
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err = ioremap_pud_range(pgd, addr, next, phys_addr+addr, prot);
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if (err)
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break;
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} while (pgd++, addr = next, addr != end);
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flush_cache_vmap(start, end);
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return err;
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}
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