linux-kernel - Re: [tip:x86/ptrace] ptrace: Add support for generic PTRACE_GETREGSET/PTRACE

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Date:	Mon, 22 Feb 2010 10:37:07 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	suresh.b.siddha@...el.com, tglx@...utronix.de, hjl.tools@...il.com,
	linux-tip-commits@...r.kernel.org, Kyle McMartin <kyle@...artin.ca>
Subject: Re: [tip:x86/ptrace] ptrace: Add support for generic
 PTRACE_GETREGSET/PTRACE_SETREGSET

> FYI, this commit broke tip:master on PARISC (other architectures are fine):
> 
>  kernel/built-in.o: In function `ptrace_request':
>  (.text.ptrace_request+0x2cc): undefined reference to `task_user_regset_view'

This means that parisc failed to meet the documented requirements for
setting CONFIG_HAVE_ARCH_TRACEHOOK, but set it anyway.  If arch folks don't
follow the specs, it defeats the whole purpose of having clear statements
of requirements for arch code.

> I'll keep them in tip:master to get them tested, but note that i cannot push 
> any of these patches into linux-next until this is fixed, as linux-next 
> requires all architectures to build, with no regard to which architectures are 
> tested by kernel testers in practice.

IMHO if parisc does not finish up its requirements RSN, it should instead:

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 524d935..f388dc6 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -18,7 +18,6 @@ config PARISC
 	select BUG
 	select HAVE_PERF_EVENTS
 	select GENERIC_ATOMIC64 if !64BIT
-	select HAVE_ARCH_TRACEHOOK
 	help
 	  The PA-RISC microprocessor is designed by Hewlett-Packard and used
 	  in many of their workstations & servers (HP9000 700 and 800 series,


Thanks,
Roland
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