Date: Sun, 24 Sep 2000 09:46:17 -0600 From: Warner Losh <imp@village.org> To: BSD <bsd@shell-server.com> Cc: Michael Allman <msa@dinosauricon.com>, stable@FreeBSD.ORG Subject: Re: Constant panics on 4.1-STABLE! Message-ID: <200009241546.e8OFkHG01180@billy-club.village.org> In-Reply-To: Your message of "Sat, 23 Sep 2000 23:20:02 CDT." <Pine.BSF.4.10.10009232316590.62035-100000@marvin.shell-server.com> References: <Pine.BSF.4.10.10009232316590.62035-100000@marvin.shell-server.com>
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In message <Pine.BSF.4.10.10009232316590.62035-100000@marvin.shell-server.com> BSD writes:
: On Wed, 20 Sep 2000, Michael Allman wrote:
: > 132 /*
: > 133 * Look up the address in the table for that Address Family
: > 134 */
: > 135 if (rnh && (rn = rnh->rnh_matchaddr((caddr_t)dst, rnh)) &&
: > 136 ((rn->rn_flags & RNF_ROOT) == 0)) {
:
: C doesn't guarantee order of execution in if ( bleh && bleh &&
: bleh). It may very well evaluate it backwards, or from the inside out if
: it wants. No?
No. That's not right. It evaluates left to right. rnh is checked
for null, then matchaddr is called and then rn->rn_flags is checked.
Warner
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