From: Thomas Gleixner <tglx@linutronix.de>
To: Andi Kleen <ak@linux.intel.com>
Cc: Andi Kleen <andi@firstfloor.org>,
x86@kernel.org, Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
Josh Poimboeuf <jpoimboe@redhat.com>
Subject: Re: [PATCH 02/17] x86, lto: Mark all top level asm statements as .text
Date: Wed, 27 Mar 2019 22:55:44 +0100 (CET) [thread overview]
Message-ID: <alpine.DEB.2.21.1903272217240.1789@nanos.tec.linutronix.de> (raw)
In-Reply-To: <20190327204049.GW18020@tassilo.jf.intel.com>
On Wed, 27 Mar 2019, Andi Kleen wrote:
> >
> > It's static so it's scope is within the file and whatever GCC does with
> > that C function it has to respect that it accesses static data. If that's
> > not true then this really needs to be fixed at the compiler side and not in
> > the kernel.
>
> Ok so you did the statics with undefined size, so kind of an extern static.
> That's a weird construct (not sure if it's even allowed in standard C), but
> somehow it seems to work in gcc with the inline assembler.
Strict C89 does not allow that, but it does not allow a lot of other things
the kernel does.
> I checked the code general and with the .globl in NATIVE_LABEL the
With or without? I removed that as well.
> generated assembler looks like it should work even for LTO yes.
>
> I guess it's an interesting alternative to making them all global.
> Maybe that will work for more cases too.
Pretty much preferred over making static stuff global all over the place.
Thanks,
tglx
next prev parent reply other threads:[~2019-03-27 21:55 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-21 21:59 Fixes and cleanup from LTO tree Andi Kleen
2019-03-21 21:59 ` [PATCH 01/17] kbuild: Disable -Waddress-of-packed-member for gcc 9 Andi Kleen
2019-03-22 13:58 ` Arnd Bergmann
2019-03-22 16:31 ` Andi Kleen
2019-03-22 16:39 ` Peter Zijlstra
2019-03-22 16:57 ` Arnd Bergmann
2019-03-22 16:58 ` Andi Kleen
2019-03-25 16:27 ` David Laight
2019-04-01 1:04 ` Masahiro Yamada
2019-03-21 21:59 ` [PATCH 02/17] x86, lto: Mark all top level asm statements as .text Andi Kleen
2019-03-26 17:03 ` Thomas Gleixner
2019-03-26 21:38 ` Andi Kleen
2019-03-26 22:25 ` Thomas Gleixner
2019-03-27 0:55 ` Andi Kleen
2019-03-27 1:08 ` Andi Kleen
2019-03-27 14:20 ` Thomas Gleixner
2019-03-27 14:39 ` Ingo Molnar
2019-03-27 14:59 ` Andi Kleen
2019-03-27 15:08 ` Thomas Gleixner
2019-03-27 15:45 ` Andi Kleen
2019-03-27 19:08 ` Thomas Gleixner
2019-03-27 20:40 ` Andi Kleen
2019-03-27 21:55 ` Thomas Gleixner [this message]
2019-03-27 22:29 ` Andi Kleen
2019-03-27 22:50 ` Thomas Gleixner
2019-04-02 8:54 ` Thomas Gleixner
2019-03-21 21:59 ` [PATCH 03/17] x86: Don't inline __const_udelay Andi Kleen
2019-03-21 21:59 ` [PATCH 04/17] init: Add __noreorder and mark initcalls __noreorder Andi Kleen
2019-03-21 21:59 ` [PATCH 05/17] Use C version for SYSCALL_ALIAS Andi Kleen
2019-03-21 21:59 ` [PATCH 06/17] locking/core: Mark spinlocks noinline when inline spinlocks are disabled Andi Kleen
2019-03-21 21:59 ` [PATCH 07/17] amdkfd: Fix extern declaration Andi Kleen
2019-03-21 22:00 ` [PATCH 08/17] x86/speculation: Fix __initconst in bugs.c Andi Kleen
2019-03-26 17:24 ` Thomas Gleixner
2019-03-21 22:00 ` [PATCH 09/17] x86/kvm: Make steal_time visible Andi Kleen
2019-03-21 22:00 ` [PATCH 10/17] delta: Fix buffer overrun in delta_ipc_open Andi Kleen
2019-04-01 13:37 ` Hugues FRUCHET
2019-04-01 16:54 ` Andi Kleen
2019-04-02 9:56 ` Hugues FRUCHET
2019-03-21 22:00 ` [PATCH 11/17] x86/kprobes: Make trampoline_handler global and visible Andi Kleen
2019-03-23 9:45 ` Masami Hiramatsu
2019-03-23 14:35 ` Andi Kleen
2019-03-25 1:53 ` Masami Hiramatsu
2019-03-21 22:00 ` [PATCH 12/17] afs: Avoid section confusion in CM_NAME Andi Kleen
2019-03-21 22:00 ` [PATCH 13/17] ASoC: AMD: Fix incorrect extern Andi Kleen
2019-03-21 22:00 ` [PATCH 14/17] crypto: Don't mark AES tables const and cacheline_aligned Andi Kleen
2019-03-26 8:42 ` Rasmus Villemoes
2019-03-26 18:30 ` Andi Kleen
2019-03-21 22:00 ` [PATCH 15/17] x86/hyperv: Make hv_vcpu_is_preempted visible Andi Kleen
2019-03-26 8:15 ` Yi Sun
2019-03-21 22:00 ` [PATCH 16/17] x86/xen: Mark xen_vcpu_stolen as __visible Andi Kleen
2019-03-21 22:00 ` [PATCH 17/17] dm: Fix const confusion in dm Andi Kleen
2019-03-22 8:34 ` [PATCH 12/17] afs: Avoid section confusion in CM_NAME David Howells
2019-03-26 17:00 ` Fixes and cleanup from LTO tree Thomas Gleixner
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