[Bug 193400] [mips] r269577 broke operation on MIPS32
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bugzilla-noreply at freebsd.org
Sat Sep 6 22:20:12 UTC 2014
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193400
--- Comment #2 from Adrian Chadd <adrian at freebsd.org> ---
Ok, here's what fixed it (ignore the error checks):
adrian at adrian-hackbox:~/work/freebsd/embedded/head/src/sys % svn diff kern
Index: kern/subr_sfbuf.c
===================================================================
--- kern/subr_sfbuf.c (revision 271210)
+++ kern/subr_sfbuf.c (working copy)
@@ -77,6 +77,14 @@
*/
static struct mtx sf_buf_lock;
+#ifndef SFBUF
+#error wtf?
+#endif
+
+#ifdef SFBUF_OPTIONAL_DIRECT_MAP
+#error wtf?
+#endif
+
/*
* Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-))
*/
@@ -127,6 +135,7 @@
("sf_buf_alloc(SFB_CPUPRIVATE): curthread not pinned"));
hash_list = &sf_buf_active[SF_BUF_HASH(m)];
mtx_lock(&sf_buf_lock);
+#if 0
LIST_FOREACH(sf, hash_list, list_entry) {
if (sf->m == m) {
sf->ref_count++;
@@ -141,6 +150,7 @@
goto done;
}
}
+#endif
while ((sf = TAILQ_FIRST(&sf_buf_freelist)) == NULL) {
if (flags & SFB_NOWAIT)
goto done;
.. the original MIPS sfbuf code didn't do the refcount stuff; it just allocated
a new page for each sfbuf requested. I don't know how correct that was, but it
worked.
So maybe you've exposed a bug in the MIPS pmap code?
-a
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