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[PATCH] mm: uml pte atomicity 

There's usually a good reason when a pte is examined without the lock; but it
makes me nervous when the pointer is dereferenced more than once.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hugh Dickins 2005-10-29 18:16:38 -07:00 committed by Linus Torvalds
parent a7e4705b24
commit 8f5cd76c18
1 changed files with 5 additions and 3 deletions
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8
arch/um/kernel/process_kern.c
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@ -222,6 +222,7 @@ void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
pte_t ptent;
if(task->mm == NULL)
return(ERR_PTR(-EINVAL));
@ -238,12 +239,13 @@ void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
return(ERR_PTR(-EINVAL));
pte = pte_offset_kernel(pmd, addr);
if(!pte_present(*pte))
ptent = *pte;
if(!pte_present(ptent))
return(ERR_PTR(-EINVAL));
if(pte_out != NULL)
*pte_out = *pte;
return((void *) (pte_val(*pte) & PAGE_MASK) + (addr & ~PAGE_MASK));
*pte_out = ptent;
return((void *) (pte_val(ptent) & PAGE_MASK) + (addr & ~PAGE_MASK));
}
char *current_cmd(void)