litmus-rt.git - The LITMUS^RT kernel.

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author	Oliver Endriss <o.endriss@gmx.de>	2010-01-10 13:38:38 -0500
committer	Mauro Carvalho Chehab <mchehab@redhat.com>	2010-02-26 13:10:38 -0500
commit	2c1f750ba3fbd4a54544a68b57087bb89f3ba92c (patch)
tree	c126e776420eed00d2b4e00dc9ceba7455be3738 /include/linux/workqueue.h
parent	76b9ef97953c120172dfc07d48e6d219164c6f6a (diff)

V4L/DVB (13986): [STV090x] Disable I2C gate on error

The I2C gate must also be disabled, if a tuner command failed. Otherwise the tuner mutex would be locked forever. Signed-off-by: Oliver Endriss <o.endriss@gmx.de> Signed-off-by: Manu Abraham <abraham.manu@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Diffstat (limited to 'include/linux/workqueue.h')

0 files changed, 0 insertions, 0 deletions

/* * mm/mremap.c * * (C) Copyright 1996 Linus Torvalds * * Address space accounting code <alan@lxorguk.ukuu.org.uk> * (C) Copyright 2002 Red Hat Inc, All Rights Reserved */ #include <linux/mm.h> #include <linux/hugetlb.h> #include <linux/shm.h> #include <linux/ksm.h> #include <linux/mman.h> #include <linux/swap.h> #include <linux/capability.h> #include <linux/fs.h> #include <linux/highmem.h> #include <linux/security.h> #include <linux/syscalls.h> #include <linux/mmu_notifier.h> #include <asm/uaccess.h> #include <asm/cacheflush.h> #include <asm/tlbflush.h> #include "internal.h" static pmd_t *get_old_pmd(struct mm_struct *mm, unsigned long addr) { pgd_t *pgd; pud_t *pud; pmd_t *pmd; pgd = pgd_offset(mm, addr); if (pgd_none_or_clear_bad(pgd)) return NULL; pud = pud_offset(pgd, addr); if (pud_none_or_clear_bad(pud)) return NULL; pmd = pmd_offset(pud, addr); split_huge_page_pmd(mm, pmd); if (pmd_none_or_clear_bad(pmd)) return NULL; return pmd; } static pmd_t *alloc_new_pmd(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr) { pgd_t *pgd; pud_t *pud; pmd_t *pmd; pgd = pgd_offset(mm, addr); pud = pud_alloc(mm, pgd, addr); if (!pud) return NULL; pmd = pmd_alloc(mm, pud, addr); if (!pmd) return NULL; VM_BUG_ON(pmd_trans_huge(*pmd)); if (pmd_none(*pmd) && __pte_alloc(mm, vma, pmd, addr)) return NULL; return pmd; } static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd, unsigned long old_addr, unsigned long old_end, struct vm_area_struct *new_vma, pmd_t *new_pmd, unsigned long new_addr) { struct address_space *mapping = NULL; struct mm_struct *mm = vma->vm_mm; pte_t *old_pte, *new_pte, pte; spinlock_t *old_ptl, *new_ptl; unsigned long old_start; old_start = old_addr; mmu_notifier_invalidate_range_start(vma->vm_mm, old_start, old_end); if (vma->vm_file) { /* * Subtle point from Rajesh Venkatasubramanian: before * moving file-based ptes, we must lock truncate_pagecache * out, since it might clean the dst vma before the src vma, * and we propagate stale pages into the dst afterward. */ mapping = vma->vm_file->f_mapping; mutex_lock(&mapping->i_mmap_mutex); } /* * We don't have to worry about the ordering of src and dst * pte locks because exclusive mmap_sem prevents deadlock. */ old_pte = pte_offset_map_lock(mm, old_pmd, old_addr, &old_ptl); new_pte = pte_offset_map(new_pmd, new_addr); new_ptl = pte_lockptr(mm, new_pmd); if (new_ptl != old_ptl) spin_lock_nested(new_ptl, SINGLE_DEPTH_NESTING); arch_enter_lazy_mmu_mode(); for (; old_addr < old_end; old_pte++, old_addr += PAGE_SIZE, new_pte++, new_addr += PAGE_SIZE) { if (pte_none(*old_pte)) continue; pte = ptep_clear_flush(vma, old_addr, old_pte); pte = move_pte(pte, new_vma->vm_page_prot, old_addr, new_addr); set_pte_at(mm, new_addr, new_pte, pte); } arch_leave_lazy_mmu_mode(); if (new_ptl != old_ptl) spin_unlock(new_ptl); pte_unmap(new_pte - 1); pte_unmap_unlock(old_pte - 1, old_ptl); if (mapping) mutex_unlock(&mapping->i_mmap_mutex); mmu_notifier_invalidate_range_end(vma->vm_mm, old_start, old_end); } #define LATENCY_LIMIT (64 * PAGE_SIZE) unsigned long move_page_tables(struct vm_area_struct *vma, unsigned long old_addr, struct vm_area_struct *new_vma, unsigned long new_addr, unsigned long len) { unsigned long extent, next, old_end; pmd_t *old_pmd, *new_pmd; old_end = old_addr + len; flush_cache_range(vma, old_addr, old_end); for (; old_addr < old_end; old_addr += extent, new_addr += extent) { cond_resched(); next = (old_addr + PMD_SIZE) & PMD_MASK; if (next - 1 > old_end) next = old_end; extent = next - old_addr; old_pmd = get_old_pmd(vma->vm_mm, old_addr); if (!old_pmd) continue; new_pmd = alloc_new_pmd(vma->vm_mm, vma, new_addr); if (!new_pmd) break; next = (new_addr + PMD_SIZE) & PMD_MASK; if (extent > next - new_addr) extent = next - new_addr; if (extent > LATENCY_LIMIT) extent = LATENCY_LIMIT; move_ptes(vma, old_pmd, old_addr, old_addr + extent, new_vma, new_pmd, new_addr); } return len + old_addr - old_end; /* how much done */ } static unsigned long move_vma(struct vm_area_struct *vma, unsigned long old_addr, unsigned long old_len, unsigned long new_len, unsigned long new_addr) { struct mm_struct *mm = vma->vm_mm; struct vm_area_struct *new_vma; unsigned long vm_flags = vma->vm_flags; unsigned long new_pgoff; unsigned long moved_len; unsigned long excess = 0; unsigned long hiwater_vm; int split = 0; int err; /* * We'd prefer to avoid failure later on in do_munmap: * which may split one vma into three before unmapping. */ if (mm->map_count >= sysctl_max_map_count - 3) return -ENOMEM; /* * Advise KSM to break any KSM pages in the area to be moved: * it would be confusing if they were to turn up at the new * location, where they happen to coincide with different KSM * pages recently unmapped. But leave vma->vm_flags as it was, * so KSM can come around to merge on vma and new_vma afterwards. */ err = ksm_madvise(vma, old_addr, old_addr + old_len, MADV_UNMERGEABLE, &vm_flags); if (err) return err; new_pgoff = vma->vm_pgoff + ((old_addr - vma->vm_start) >> PAGE_SHIFT); new_vma = copy_vma(&vma, new_addr, new_len, new_pgoff); if (!new_vma) return -ENOMEM; moved_len = move_page_tables(vma, old_addr, new_vma, new_addr, old_len); if (moved_len < old_len) { /* * On error, move entries back from new area to old, * which will succeed since page tables still there, * and then proceed to unmap new area instead of old. */ move_page_tables(new_vma, new_addr, vma, old_addr, moved_len); vma = new_vma; old_len = new_len; old_addr = new_addr; new_addr = -ENOMEM; } /* Conceal VM_ACCOUNT so old reservation is not undone */ if (vm_flags & VM_ACCOUNT) { vma->vm_flags &= ~VM_ACCOUNT; excess = vma->vm_end - vma->vm_start - old_len; if (old_addr > vma->vm_start && old_addr + old_len < vma->vm_end) split = 1; } /* * If we failed to move page tables we still do total_vm increment * since do_munmap() will decrement it by old_len == new_len. * * Since total_vm is about to be raised artificially high for a * moment, we need to restore high watermark afterwards: if stats * are taken meanwhile, total_vm and hiwater_vm appear too high. * If this were a serious issue, we'd add a flag to do_munmap(). */ hiwater_vm = mm->hiwater_vm; mm->total_vm += new_len >> PAGE_SHIFT; vm_stat_account(mm, vma->vm_flags, vma->vm_file, new_len>>PAGE_SHIFT); if (do_munmap(mm, old_addr, old_len) < 0) { /* OOM: unable to split vma, just get accounts right */ vm_unacct_memory(excess >> PAGE_SHIFT); excess = 0; } mm->hiwater_vm = hiwater_vm; /* Restore VM_ACCOUNT if one or two pieces of vma left */ if (excess) { vma->vm_flags |= VM_ACCOUNT; if (split) vma->vm_next->vm_flags |= VM_ACCOUNT; } if (vm_flags & VM_LOCKED) { mm->locked_vm += new_len >> PAGE_SHIFT; if (new_len > old_len) mlock_vma_pages_range(new_vma, new_addr + old_len, new_addr + new_len); } return new_addr; } static struct vm_area_struct *vma_to_resize(unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long *p) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma = find_vma(mm, addr); if (!vma || vma->vm_start > addr) goto Efault; if (is_vm_hugetlb_page(vma)) goto Einval; /* We can't remap across vm area boundaries */ if (old_len > vma->vm_end - addr) goto Efault; /* Need to be careful about a growing mapping */ if (new_len > old_len) { unsigned long pgoff; if (vma->vm_flags & (VM_DONTEXPAND | VM_PFNMAP)) goto Efault; pgoff = (addr - vma->vm_start) >> PAGE_SHIFT; pgoff += vma->vm_pgoff; if (pgoff + (new_len >> PAGE_SHIFT) < pgoff) goto Einval; } if (vma->vm_flags & VM_LOCKED) { unsigned long locked, lock_limit; locked = mm->locked_vm << PAGE_SHIFT; lock_limit = rlimit(RLIMIT_MEMLOCK); locked += new_len - old_len; if (locked > lock_limit && !capable(CAP_IPC_LOCK)) goto Eagain; } if (!may_expand_vm(mm, (new_len - old_len) >> PAGE_SHIFT)) goto Enomem; if (vma->vm_flags & VM_ACCOUNT) { unsigned long charged = (new_len - old_len) >> PAGE_SHIFT; if (security_vm_enough_memory(charged)) goto Efault; *p = charged; } return vma; Efault: /* very odd choice for most of the cases, but... */ return ERR_PTR(-EFAULT); Einval: return ERR_PTR(-EINVAL); Enomem: return ERR_PTR(-ENOMEM); Eagain: return ERR_PTR(-EAGAIN); } static unsigned long mremap_to(unsigned long addr, unsigned long old_len, unsigned long new_addr, unsigned long new_len) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma; unsigned long ret = -EINVAL; unsigned long charged = 0; unsigned long map_flags; if (new_addr & ~PAGE_MASK) goto out; if (new_len > TASK_SIZE || new_addr > TASK_SIZE - new_len) goto out; /* Check if the location we're moving into overlaps the * old location at all, and fail if it does. */ if ((new_addr <= addr) && (new_addr+new_len) > addr) goto out; if ((addr <= new_addr) && (addr+old_len) > new_addr) goto out; ret = security_file_mmap(NULL, 0, 0, 0, new_addr, 1); if (ret) goto out; ret = do_munmap(mm, new_addr, new_len); if (ret) goto out; if (old_len >= new_len) { ret = do_munmap(mm, addr+new_len, old_len - new_len); if (ret && old_len != new_len) goto out; old_len = new_len; } vma = vma_to_resize(addr, old_len, new_len, &charged); if (IS_ERR(vma)) { ret = PTR_ERR(vma); goto out; } map_flags = MAP_FIXED; if (vma->vm_flags & VM_MAYSHARE) map_flags |= MAP_SHARED; ret = get_unmapped_area(vma->vm_file, new_addr, new_len, vma->vm_pgoff + ((addr - vma->vm_start) >> PAGE_SHIFT), map_flags); if (ret & ~PAGE_MASK) goto out1; ret = move_vma(vma, addr, old_len, new_len, new_addr); if (!(ret & ~PAGE_MASK)) goto out; out1: vm_unacct_memory(charged); out: return ret; } static int vma_expandable(struct vm_area_struct *vma, unsigned long delta) { unsigned long end = vma->vm_end + delta; if (end < vma->vm_end) /* overflow */ return 0; if (vma->vm_next && vma->vm_next->vm_start < end) /* intersection */ return 0; if (get_unmapped_area(NULL, vma->vm_start, end - vma->vm_start, 0, MAP_FIXED) & ~PAGE_MASK) return 0; return 1; } /* * Expand (or shrink) an existing mapping, potentially moving it at the * same time (controlled by the MREMAP_MAYMOVE flag and available VM space) * * MREMAP_FIXED option added 5-Dec-1999 by Benjamin LaHaise * This option implies MREMAP_MAYMOVE. */ unsigned long do_mremap(unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags, unsigned long new_addr) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma; unsigned long ret = -EINVAL; unsigned long charged = 0; if (flags & ~(MREMAP_FIXED | MREMAP_MAYMOVE)) goto out; if (addr & ~PAGE_MASK) goto out; old_len = PAGE_ALIGN(old_len); new_len = PAGE_ALIGN(new_len); /* * We allow a zero old-len as a special case * for DOS-emu "duplicate shm area" thing. But * a zero new-len is nonsensical. */ if (!new_len) goto out; if (flags & MREMAP_FIXED) { if (flags & MREMAP_MAYMOVE) ret = mremap_to(addr, old_len, new_addr, new_len); goto out; } /* * Always allow a shrinking remap: that just unmaps * the unnecessary pages.. * do_munmap does all the needed commit accounting */ if (old_len >= new_len) { ret = do_munmap(mm, addr+new_len, old_len - new_len);


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