From: Andrew Morton <akpm@osdl.org>
To: "Jan Beulich" <JBeulich@novell.com>
Cc: linux-kernel@vger.kernel.org, Andi Kleen <ak@muc.de>,
Paul Mackerras <paulus@samba.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [PATCH] CONFIG_UNWIND_INFO
Date: Sat, 14 Jan 2006 04:56:35 -0800 [thread overview]
Message-ID: <20060114045635.1462fb9e.akpm@osdl.org> (raw)
In-Reply-To: <4370AF4A.76F0.0078.0@novell.com>
"Jan Beulich" <JBeulich@novell.com> wrote:
>
> As a foundation for reliable stack unwinding, this adds a config option
> (available to all architectures except IA64) to enable the generation
> of frame unwind information.
>
This breaks ppc64.
> Index: linux/Makefile
> ===================================================================
> --- linux.orig/Makefile
> +++ linux/Makefile
> @@ -502,6 +502,10 @@ CFLAGS += $(call add-align,CONFIG_CC_AL
> CFLAGS += $(call add-align,CONFIG_CC_ALIGN_LOOPS,-loops)
> CFLAGS += $(call add-align,CONFIG_CC_ALIGN_JUMPS,-jumps)
>
> +ifdef CONFIG_UNWIND_INFO
> +CFLAGS += -fasynchronous-unwind-tables
> +endif
> +
> ifdef CONFIG_FRAME_POINTER
> CFLAGS += -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
> else
> Index: linux/lib/Kconfig.debug
> ===================================================================
> --- linux.orig/lib/Kconfig.debug
> +++ linux/lib/Kconfig.debug
> @@ -195,6 +195,16 @@ config FRAME_POINTER
> some architectures or if you use external debuggers.
> If you don't debug the kernel, you can say N.
>
> +config UNWIND_INFO
> + bool "Compile the kernel with frame unwind information"
> + depends on !IA64
> + default DEBUG_KERNEL
> + help
> + If you say Y here the resulting kernel image will be slightly larger
> + but not slower, and it will give very useful debugging information.
> + If you don't debug the kernel, you can say N, but we may not be able
> + to solve problems without frame unwind information or frame pointers.
> +
> config RCU_TORTURE_TEST
> tristate "torture tests for RCU"
> depends on DEBUG_KERNEL
>
If you do a `make oldconfig' with CONFIG_DEBUG_KERNEL you get
-fasynchronous-unwind-tables and (on my yellowdog-4 toolchain at least) the
ppc64 kernel doesn't like that one bit.
EXT3-fs: mounted filesystem with ordered data mode.
ADDRCONF(NETDEV_UP): eth0: link is not ready
tg3: eth0: Link is up at 100 Mbps, full duplex.
tg3: eth0: Flow control is off for TX and off for RX.
ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
autofs: Unknown ADD relocation: 44
sunrpc: Unknown ADD relocation: 44
lockd: Unknown symbol svc_recv
lockd: Unknown symbol svc_create
lockd: Unknown symbol rpciod_up
lockd: Unknown symbol rpc_destroy_client
lockd: Unknown symbol xdr_encode_netobj
lockd: Unknown symbol svc_destroy
lockd: Unknown symbol xprt_create_proto
lockd: Unknown symbol rpc_delay
lockd: Unknown symbol rpc_call_async
lockd: Unknown symbol rpc_create_client
lockd: Unknown symbol svc_makesock
lockd: Unknown symbol nlm_debug
lockd: Unknown symbol xdr_decode_netobj
lockd: Unknown symbol svc_wake_up
lockd: Unknown symbol rpc_force_rebind
lockd: Unknown symbol rpciod_down
lockd: Unknown symbol svc_exit_thread
lockd: Unknown symbol xdr_encode_string
lockd: Unknown symbol rpc_call_sync
lockd: Unknown symbol xdr_decode_string_inplace
lockd: Unknown symbol svc_set_client
lockd: Unknown symbol svc_process
lockd: Unknown symbol xprt_set_timeout
lockd: Unknown symbol rpc_restart_call
lockd: Unknown symbol svc_create_thread
exportfs: Unknown ADD relocation: 44
sunrpc: Unknown ADD relocation: 44
lockd: Unknown symbol svc_recv
lockd: Unknown symbol svc_create
lockd: Unknown symbol rpciod_up
lockd: Unknown symbol rpc_destroy_client
I fixed it up for now by sticking an `&& !PPC64' in there, but why did it
break, and what other architectures/toolchains broke?
next prev parent reply other threads:[~2006-01-14 12:57 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-08 12:59 [PATCH] CONFIG_UNWIND_INFO Jan Beulich
2006-01-14 12:56 ` Andrew Morton [this message]
2006-01-14 14:03 ` Sam Ravnborg
2006-01-16 7:36 ` Jan Beulich
2006-01-16 7:46 ` Andrew Morton
2006-01-18 11:48 ` Paul Mackerras
2006-01-18 15:18 ` Andi Kleen
2006-01-18 15:58 ` Jan Beulich
2006-01-18 16:11 ` Andi Kleen
2006-01-18 16:48 ` Jan Beulich
2006-01-20 4:47 ` Paul Mackerras
2006-01-20 6:13 ` Andi Kleen
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