[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v4 0/9] add xenalyze to staging
On Wed, 2015-06-03 at 11:33 +0100, George Dunlap wrote: > On 06/03/2015 11:10 AM, Ian Campbell wrote: > > On Sat, 2015-05-23 at 08:24 +0000, Olaf Hering wrote: > >> Having xenalyze in the source tree makes it much easier to keep private > >> debug code in hypervisor and xenalyze in sync. It helped alot while > >> debugging the root cause for commit > >> 607e8494c42397fb249191904066cace6ac9a880. > > > > I'm afraid it doesn't build on arm64. > > > > Some of these actually look like non-arch specific failures (e.g. > > conflicts with register_t from system headers) or issues which should > > probably be addressed with xenalyze in tree (e.g. NR_CPUS ought to be > > available directly now?) or with some trivial #ifdef modifications. > > > > That said, I don't know that xentrace actually works on ARM nor that > > xenalyze could analyse such traces even with the build issues addressed, > > so I'd be equally happy if this was just made x86 only. > > > > In file included from /usr/aarch64-linux-gnu/include/linux/types.h:4:0, > > from /usr/aarch64-linux-gnu/include/asm/ptrace.h:22, > > from /usr/aarch64-linux-gnu/include/sys/user.h:25, > > from /usr/aarch64-linux-gnu/include/sys/procfs.h:34, > > from /usr/aarch64-linux-gnu/include/sys/ucontext.h:26, > > from /usr/aarch64-linux-gnu/include/signal.h:360, > > from /usr/aarch64-linux-gnu/include/sys/wait.h:30, > > from xenalyze.c:28: > > /local/scratch/ianc/devel/committer-arm64.git/tools/xentrace/../../xen/include/asm/types.h:54:13: > > error: conflicting types for 'register_t' > > typedef u64 register_t; > > ^ > > In file included from /usr/aarch64-linux-gnu/include/stdlib.h:314:0, > > from xenalyze.c:24: > > /usr/aarch64-linux-gnu/include/sys/types.h:205:13: note: previous > > declaration of 'register_t' was here > > typedef int register_t __attribute__ ((__mode__ (__word__))); > > ^ > > The weird thing about this one is that register_t isn't defined or used > by xenalyze at all. > > The include pedigree is a bit confusing, but it looks like > aarch64-linux-gnu/include/linux/types.h is including Xen files, and that > there's a type mismatch between Xen's xen/include/asm/types.h and the > system's include/sys/types.h. > > It looks like it will happen to any program which includes both #include > both stdlib.h and sys/wait.h. If so, this is a general problem with Xen > on ARM64, not a bug in xenalyze. > > (But as I said, the #include chain is a bit confusing, so I feel free to > correct me if I got something wrong...) Has tools/xentrace/../../xen/include/asm/types.h ended up shadowing an <asm/types.h> from one of these headers, which should have included /usr/<arch>/include/asm/types.h? IOW the bug is in CFLAGS using some -I... or other, and/or in the fact that our include directory somehow shadows the real ones? [...] > If including <sys/wait.h> will reliably include the Xen headers, It seems to me like a bug that it does so for userspace code... > then we > can just remove NR_CPUS and BITS_PER_LONG from analyze.h. In the case > of NR_CPUS it would be preferable actually, since then we wouldn't need > to worry about keeping those two in sync. > > But I suspect that this is a quirk of aarm64 (or perhaps of IanC's build > environment) that won't be duplicated on x86. > > -George _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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