unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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[PATCH] Add NOPFN_REFAULT result from vm_ops->nopfn()

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Add a NOPFN_REFAULT return code for vm_ops->nopfn() equivalent to
NOPAGE_REFAULT for vmops->nopage() indicating that the handler requests a
re-execution of the faulting instruction

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Benjamin Herrenschmidt 2007-02-12 00:51:38 -08:00 committed by Linus Torvalds
parent e0dc0d8f4a
commit 22cd25ed31
2 changed files with 5 additions and 2 deletions
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1
include/linux/mm.h
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@ -637,6 +637,7 @@ static inline int page_mapped(struct page *page)
*/
#define NOPFN_SIGBUS ((unsigned long) -1)
#define NOPFN_OOM ((unsigned long) -2)
#define NOPFN_REFAULT ((unsigned long) -3)
/*
* Different kinds of faults, as returned by handle_mm_fault().

6
mm/memory.c
View file

@ -2355,10 +2355,12 @@ static noinline int do_no_pfn(struct mm_struct *mm, struct vm_area_struct *vma,
BUG_ON(is_cow_mapping(vma->vm_flags));
pfn = vma->vm_ops->nopfn(vma, address & PAGE_MASK);
if (pfn == NOPFN_OOM)
if (unlikely(pfn == NOPFN_OOM))
return VM_FAULT_OOM;
if (pfn == NOPFN_SIGBUS)
else if (unlikely(pfn == NOPFN_SIGBUS))
return VM_FAULT_SIGBUS;
else if (unlikely(pfn == NOPFN_REFAULT))
return VM_FAULT_MINOR;
page_table = pte_offset_map_lock(mm, pmd, address, &ptl);