From: Jiri Slaby <jslaby@suse.cz>
To: Ingo Molnar <mingo@kernel.org>, Pavel Machek <pavel@ucw.cz>,
Josh Poimboeuf <jpoimboe@redhat.com>
Cc: mingo@redhat.com, tglx@linutronix.de, hpa@zytor.com,
x86@kernel.org, linux-kernel@vger.kernel.org,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>,
xen-devel@lists.xenproject.org,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <len.brown@intel.com>,
linux-pm@vger.kernel.org
Subject: Re: [PATCH v2 02/10] x86: assembly, FUNC_START for fn, DATA_START for data
Date: Wed, 22 Mar 2017 08:39:40 +0100 [thread overview]
Message-ID: <ee3242f9-1fab-f3a8-947d-85fc1a660a49@suse.cz> (raw)
In-Reply-To: <20170322072557.GA13904@gmail.com>
On 03/22/2017, 08:25 AM, Ingo Molnar wrote:
>
> * Pavel Machek <pavel@ucw.cz> wrote:
>
>> Hi!
>>
>>> -ENTRY(saved_rbp) .quad 0
>>> -ENTRY(saved_rsi) .quad 0
>>> -ENTRY(saved_rdi) .quad 0
>>> -ENTRY(saved_rbx) .quad 0
>>> +SYM_DATA_START(saved_rbp) .quad 0
>>> +SYM_DATA_START(saved_rsi) .quad 0
>>> +SYM_DATA_START(saved_rdi) .quad 0
>>> +SYM_DATA_START(saved_rbx) .quad 0
>>
>> Does it make sense to call it SYM_DATA_*START* when there's no
>> corresponding end?
>
> That looks like a bug - I think we should strive for them to always be in pairs.
>
> Jiri, Josh, could objtool help here perhaps, to detect 'non-terminated'
> SYM_*_START() uses? This could be done by emitting debug data into a special
> section and then analyzing that section for unpaired entries. The section can be
> discarded in the final link, it won't show up in the kernel image.
It should be easier than that. No introduction of other info needed --
every global symbol without a ".type" or ".size" (i.e. SYM_*_END) should
be a bug now.
> We don't ever nest symbols, right?
AFAI could see so far, correct.
>> Plus... it looks like saved_rsi (and friends) are only used inside
>> wakeup_64.S. Could we just delete the "ENTRY" annotations?
>
> That appears to make sense as well.
+1, will fix this.
thanks,
--
js
suse labs
next prev parent reply other threads:[~2017-03-22 7:39 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-17 10:47 [PATCH 01/10] x86: assembly, ENTRY for fn, GLOBAL for data Jiri Slaby
2017-02-17 10:47 ` [PATCH 02/10] x86: assembly, use ENDPROC for functions Jiri Slaby
2017-02-17 11:08 ` Juergen Gross
2017-02-17 11:06 ` [PATCH 01/10] x86: assembly, ENTRY for fn, GLOBAL for data Juergen Gross
2017-03-01 9:38 ` Ingo Molnar
2017-03-01 9:50 ` Jiri Slaby
2017-03-01 10:09 ` Thomas Gleixner
2017-03-01 10:27 ` Ingo Molnar
2017-03-03 12:22 ` Jiri Slaby
2017-03-03 18:20 ` hpa
2017-03-06 14:09 ` Jiri Slaby
2017-03-07 7:57 ` Ingo Molnar
2017-03-03 18:24 ` hpa
2017-03-07 8:27 ` Ingo Molnar
2017-03-07 17:24 ` [RFC] linkage: new macros for functions and data Jiri Slaby
2017-03-16 8:02 ` Ingo Molnar
2017-03-16 8:13 ` Jiri Slaby
2017-03-20 12:32 ` [PATCH v2 01/10] linkage: new macros for assembler symbols Jiri Slaby
2017-03-20 12:32 ` [PATCH v2 02/10] x86: assembly, FUNC_START for fn, DATA_START for data Jiri Slaby
2017-03-20 13:32 ` Josh Poimboeuf
2017-03-20 15:32 ` Jiri Slaby
2017-03-20 16:07 ` Josh Poimboeuf
2017-03-21 14:08 ` Pavel Machek
2017-03-22 7:25 ` Ingo Molnar
2017-03-22 7:39 ` Jiri Slaby [this message]
2017-03-22 7:46 ` Ingo Molnar
2017-03-22 14:11 ` Josh Poimboeuf
2017-03-22 15:01 ` Jiri Slaby
2017-03-22 15:33 ` Josh Poimboeuf
2017-03-23 7:38 ` Ingo Molnar
2017-03-23 13:24 ` Josh Poimboeuf
2017-03-22 12:06 ` Jiri Slaby
2017-03-22 15:52 ` Pavel Machek
2017-03-20 12:32 ` [PATCH v2 03/10] x86: assembly, use SYM_FUNC_END for functions Jiri Slaby
2017-03-21 14:48 ` Josh Poimboeuf
2017-03-22 7:29 ` Ingo Molnar
2017-03-22 14:26 ` Josh Poimboeuf
2017-03-22 15:44 ` Jiri Slaby
2017-04-10 11:23 ` Jiri Slaby
2017-04-10 19:35 ` Josh Poimboeuf
2017-04-12 6:24 ` Jiri Slaby
2017-04-12 6:52 ` Ingo Molnar
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