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authorPaul Mundt <lethal@linux-sh.org>2009-01-08 07:04:48 -0500
committerDavid Howells <dhowells@redhat.com>2009-01-08 07:04:48 -0500
commitab2e83ead4eca9e045daac4cbf66eb1e7a244bb2 (patch)
tree0e42c62476d09a5b7389ba02eb093448af36c58b /mm/nommu.c
parent0f3e442a403a344a5d0a49af9ecd7632b7e7343a (diff)
NOMMU: Teach kobjsize() about VMA regions.
Now that we no longer use compound pages for all large allocations, kobjsize() actively breaks things like binfmt_flat by always handing back PAGE_SIZE for mmap'ed regions. Fix this up by looking up the VMA region for non-compounds. Ideally binfmt_flat wants to get rid of kobjsize() completely, but this is an incremental step. Signed-off-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Mike Frysinger <vapier.adi@gmail.com>
Diffstat (limited to 'mm/nommu.c')
-rw-r--r--mm/nommu.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/mm/nommu.c b/mm/nommu.c
index a6e8ccfbd400..60ed8375c986 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -149,6 +149,20 @@ unsigned int kobjsize(const void *objp)
149 return ksize(objp); 149 return ksize(objp);
150 150
151 /* 151 /*
152 * If it's not a compound page, see if we have a matching VMA
153 * region. This test is intentionally done in reverse order,
154 * so if there's no VMA, we still fall through and hand back
155 * PAGE_SIZE for 0-order pages.
156 */
157 if (!PageCompound(page)) {
158 struct vm_area_struct *vma;
159
160 vma = find_vma(current->mm, (unsigned long)objp);
161 if (vma)
162 return vma->vm_end - vma->vm_start;
163 }
164
165 /*
152 * The ksize() function is only guaranteed to work for pointers 166 * The ksize() function is only guaranteed to work for pointers
153 * returned by kmalloc(). So handle arbitrary pointers here. 167 * returned by kmalloc(). So handle arbitrary pointers here.
154 */ 168 */