Date: Fri, 14 Aug 2009 21:50:47 +0000 (UTC) From: "Bjoern A. Zeeb" <bz@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/kern kern_mutex.c kern_rwlock.c kern_sx.c src/sys/sys systm.h Message-ID: <200908142151.n7ELp3pK046674@repoman.freebsd.org>
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bz 2009-08-14 21:50:47 UTC
FreeBSD src repository
Modified files: (Branch: RELENG_8)
sys/kern kern_mutex.c kern_rwlock.c kern_sx.c
sys/sys systm.h
Log:
SVN rev 196227 on 2009-08-14 21:50:47Z by bz
MFC r196226:
Add a new macro to test that a variable could be loaded atomically.
Check that the given variable is at most uintptr_t in size and that
it is aligned.
Note: ASSERT_ATOMIC_LOAD() uses ALIGN() to check for adequate
alignment -- however, the function of ALIGN() is to guarantee
alignment, and therefore may lead to stronger alignment
enforcement than necessary for types that are smaller than
sizeof(uintptr_t).
Add checks to mtx, rw and sx locks init functions to detect possible
breakage. This was used during debugging of the problem fixed with
r196118 where a pointer was on an un-aligned address in the dpcpu area.
In collaboration with: rwatson
Reviewed by: rwatson
Approved by: re (kib)
Revision Changes Path
1.213.2.2 +2 -0 src/sys/kern/kern_mutex.c
1.48.2.2 +2 -0 src/sys/kern/kern_rwlock.c
1.67.2.2 +2 -0 src/sys/kern/kern_sx.c
1.276.2.2 +4 -0 src/sys/sys/systm.h
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