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Code Issues Releases Activity

- Correct a long-standing race condition in vm_page_try_to_free() that

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could result in a dirty page being unintentionally freed.
 - Simplify the dirty page check in vm_page_dontneed().

Reviewed by:	tegge
MFC after:	7 days
This commit is contained in:
Alan Cox 2004-02-19 07:43:55 +00:00
parent 3c8e9ebafb
commit 0f75a97722
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=125990
1 changed files with 3 additions and 4 deletions
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7
sys/vm/vm_page.c
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@ -1316,11 +1316,10 @@ vm_page_try_to_free(vm_page_t m)
(m->flags & (PG_BUSY|PG_UNMANAGED))) {
return (0);
}
vm_page_test_dirty(m);
pmap_remove_all(m);
if (m->dirty)
return (0);
vm_page_busy(m);
pmap_remove_all(m);
vm_page_free(m);
return (1);
}
@ -1405,8 +1404,8 @@ vm_page_dontneed(vm_page_t m)
return;
}
if (m->dirty == 0)
vm_page_test_dirty(m);
if (m->dirty == 0 && pmap_is_modified(m))
vm_page_dirty(m);
if (m->dirty || (dnw & 0x0070) == 0) {
/*