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Code Issues Releases Wiki Activity

mm: remove VM_FAULT_WRITE 

All users -- GUP and KSM -- are gone, let's just remove it.

Link: https://lkml.kernel.org/r/20221021101141.84170-4-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Acked-by: Peter Xu <peterx@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2022-10-21 12:11:35 +02:00 committed by Andrew Morton
parent 58f595c665
commit cb8d863313
3 changed files with 5 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/mm_types.h
View File

@ -929,7 +929,6 @@ typedef __bitwise unsigned int vm_fault_t;
* @VM_FAULT_OOM: Out Of Memory
* @VM_FAULT_SIGBUS: Bad access
* @VM_FAULT_MAJOR: Page read from storage
* @VM_FAULT_WRITE: Special case for get_user_pages
* @VM_FAULT_HWPOISON: Hit poisoned small page
* @VM_FAULT_HWPOISON_LARGE: Hit poisoned large page. Index encoded
* in upper bits
@ -950,7 +949,6 @@ enum vm_fault_reason {
VM_FAULT_OOM = (__force vm_fault_t)0x000001,
VM_FAULT_SIGBUS = (__force vm_fault_t)0x000002,
VM_FAULT_MAJOR = (__force vm_fault_t)0x000004,
VM_FAULT_WRITE = (__force vm_fault_t)0x000008,
VM_FAULT_HWPOISON = (__force vm_fault_t)0x000010,
VM_FAULT_HWPOISON_LARGE = (__force vm_fault_t)0x000020,
VM_FAULT_SIGSEGV = (__force vm_fault_t)0x000040,
@ -976,7 +974,6 @@ enum vm_fault_reason {
{ VM_FAULT_OOM, "OOM" }, \
{ VM_FAULT_SIGBUS, "SIGBUS" }, \
{ VM_FAULT_MAJOR, "MAJOR" }, \
{ VM_FAULT_WRITE, "WRITE" }, \
{ VM_FAULT_HWPOISON, "HWPOISON" }, \
{ VM_FAULT_HWPOISON_LARGE, "HWPOISON_LARGE" }, \
{ VM_FAULT_SIGSEGV, "SIGSEGV" }, \

2
mm/huge_memory.c
View File

@ -1376,7 +1376,7 @@ reuse:
if (pmdp_set_access_flags(vma, haddr, vmf->pmd, entry, 1))
update_mmu_cache_pmd(vma, vmf->address, vmf->pmd);
spin_unlock(vmf->ptl);
return VM_FAULT_WRITE;
return 0;
}
unlock_fallback:

9
mm/memory.c
View File

@ -3213,7 +3213,7 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
}
delayacct_wpcopy_end();
return (page_copied && !unshare) ? VM_FAULT_WRITE : 0;
return 0;
oom_free_new:
put_page(new_page);
oom:
@ -3277,14 +3277,14 @@ static vm_fault_t wp_pfn_shared(struct vm_fault *vmf)
return finish_mkwrite_fault(vmf);
}
wp_page_reuse(vmf);
return VM_FAULT_WRITE;
return 0;
}
static vm_fault_t wp_page_shared(struct vm_fault *vmf)
__releases(vmf->ptl)
{
struct vm_area_struct *vma = vmf->vma;
vm_fault_t ret = VM_FAULT_WRITE;
vm_fault_t ret = 0;
get_page(vmf->page);
@ -3430,7 +3430,7 @@ reuse:
return 0;
}
wp_page_reuse(vmf);
return VM_FAULT_WRITE;
return 0;
}
copy:
/*
@ -3944,7 +3944,6 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
if (vmf->flags & FAULT_FLAG_WRITE) {
pte = maybe_mkwrite(pte_mkdirty(pte), vma);
vmf->flags &= ~FAULT_FLAG_WRITE;
ret |= VM_FAULT_WRITE;
}
rmap_flags |= RMAP_EXCLUSIVE;
}