[src/trunk]: src/sys/arch/x86/x86 While reserving memory at boot time via uvm...

[cherry <cherry%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/a60bf3277a0d
branches:  trunk
changeset: 350322:a60bf3277a0d
user:      cherry <cherry%NetBSD.org@localhost>
date:      Tue Jan 10 09:48:22 2017 +0000

description:
While reserving memory at boot time via uvm_physseg_unplug(9),
in the case of a disappearing segment (due to a segment sized msgbuf)
make sure segment offsets are read off before the segment disappears.

This should fix some of the recent boot time hard resets reported on
i386 recently.

Thanks to kre@ for pointing this out to me.


CVS: ----------------------------------------------------------------------
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CVS: please use "PR category/123" to have the commitmsg appended to PR 123
CVS:
CVS: Please evaluate your changes and consider the following.
CVS: Abort checkin if you answer no.
CVS: => For all changes:
CVS: Do the changed files compile?
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CVS: Has the change been posted for review?
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diffstat:

 sys/arch/x86/x86/x86_machdep.c |  10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diffs (34 lines):

diff -r 0c22b0868634 -r a60bf3277a0d sys/arch/x86/x86/x86_machdep.c
--- a/sys/arch/x86/x86/x86_machdep.c    Tue Jan 10 09:32:01 2017 +0000
+++ b/sys/arch/x86/x86/x86_machdep.c    Tue Jan 10 09:48:22 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: x86_machdep.c,v 1.80 2016/12/26 17:54:07 cherry Exp $  */
+/*     $NetBSD: x86_machdep.c,v 1.81 2017/01/10 09:48:22 cherry Exp $  */
 
 /*-
  * Copyright (c) 2002, 2006, 2007 YAMAMOTO Takashi,
@@ -31,7 +31,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: x86_machdep.c,v 1.80 2016/12/26 17:54:07 cherry Exp $");
+__KERNEL_RCSID(0, "$NetBSD: x86_machdep.c,v 1.81 2017/01/10 09:48:22 cherry Exp $");
 
 #include "opt_modular.h"
 #include "opt_physmem.h"
@@ -933,12 +933,12 @@
        if (uvm_physseg_get_avail_end(x) - uvm_physseg_get_avail_start(x) < atop(sz))
                sz = ctob(uvm_physseg_get_avail_end(x) - uvm_physseg_get_avail_start(x));
 
+       msgbuf_p_seg[msgbuf_p_cnt].sz = sz;
+       msgbuf_p_seg[msgbuf_p_cnt++].paddr = ctob(uvm_physseg_get_avail_end(x)) - sz;
        uvm_physseg_unplug(uvm_physseg_get_end(x) - atop(sz), atop(sz));
-       msgbuf_p_seg[msgbuf_p_cnt].sz = sz;
-        msgbuf_p_seg[msgbuf_p_cnt++].paddr = ctob(uvm_physseg_get_avail_end(x));
 
        /* Now find where the new avail_end is. */
-       avail_end = ctob(uvm_physseg_get_avail_end(x));
+       avail_end = ctob(uvm_physseg_get_highest_frame());
 
        if (sz == reqsz)
                return;