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Modify release_page() to handle a missing fault page.

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r353890 introduced a case where we may call release_page() with
fs.m == NULL, since the fault handler may now lock the vnode prior
to allocating a page for a page-in.

Reported by:	jhb
Reviewed by:	kib
MFC with:	r353890
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D22120
This commit is contained in:
markj 2019-10-23 20:39:21 +00:00
parent 7b56e1d765
commit 7670099e0b
1 changed files with 7 additions and 5 deletions
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12
sys/vm/vm_fault.c
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@ -154,11 +154,13 @@ static inline void
release_page(struct faultstate *fs)
{
vm_page_xunbusy(fs->m);
vm_page_lock(fs->m);
vm_page_deactivate(fs->m);
vm_page_unlock(fs->m);
fs->m = NULL;
if (fs->m != NULL) {
vm_page_xunbusy(fs->m);
vm_page_lock(fs->m);
vm_page_deactivate(fs->m);
vm_page_unlock(fs->m);
fs->m = NULL;
}
}
static inline void