Date: Sun, 12 May 2013 20:44:28 +0000 (UTC) From: Jeff Roberson <jeff@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r250578 - head/sys/sys Message-ID: <201305122044.r4CKiSeR069114@svn.freebsd.org>
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Author: jeff Date: Sun May 12 20:44:28 2013 New Revision: 250578 URL: http://svnweb.freebsd.org/changeset/base/250578 Log: - pctrie really only requires two byte alignment so that there is a single bit available for a flag in the pointer. However, it felt more correct to enforce natural alignment of the key pointer. Unfortunately on 32bit architectures 64bit integers are not always naturally aligned. Change the assert to enforce only 32bit alignment of the 64bit key for now to fix the build. A more correct fix would be to properly sort the struct buf fields which definitely suffer from bloat due to padding. Modified: head/sys/sys/pctrie.h Modified: head/sys/sys/pctrie.h ============================================================================== --- head/sys/sys/pctrie.h Sun May 12 16:50:18 2013 (r250577) +++ head/sys/sys/pctrie.h Sun May 12 20:44:28 2013 (r250578) @@ -38,7 +38,11 @@ #define PCTRIE_DEFINE(name, type, field, allocfn, freefn) \ \ CTASSERT(sizeof(((struct type *)0)->field) == sizeof(uint64_t)); \ -CTASSERT((__offsetof(struct type, field) & (sizeof(uint64_t) - 1)) == 0); \ +/* \ + * XXX This assert protects flag bits, it does not enforce natural \ + * alignment. 32bit architectures do not naturally align 64bit fields. \ + */ \ +CTASSERT((__offsetof(struct type, field) & (sizeof(uint32_t) - 1)) == 0); \ \ static __inline struct type * \ name##_PCTRIE_VAL2PTR(uint64_t *val) \ _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscribe@freebsd.org"
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