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From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v7 0/9] ARM: VDSO
Date: Fri, 27 Jun 2014 09:57:06 +0100	[thread overview]
Message-ID: <20140627085705.GC32514@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20140627085125.GA7088@hal>

On Fri, Jun 27, 2014 at 10:51:27AM +0200, Jan Glauber wrote:
> On Sun, Jun 22, 2014 at 10:11:49PM -0500, Nathan Lynch wrote:
> > Provide fast userspace implementations of gettimeofday and
> > clock_gettime on systems that implement the generic timers extension
> > defined in ARMv7.  This follows the example of arm64 in conception but
> > significantly differs in some aspects of the implementation (C vs
> > assembly, mainly).
> 
> Hi Nathan,
> 
> applying your patches I get the following compile error under Ubuntu 12.04:
> 
>   CC      arch/arm/kernel/vdso.o
>   LDS     arch/arm/kernel/vdso/vdso.lds
>   CC      arch/arm/kernel/vdso/vgettimeofday.o
>   AS      arch/arm/kernel/vdso/datapage.o
>   VDSOL   arch/arm/kernel/vdso/vdso.so.raw
>   HOSTCC  arch/arm/kernel/vdso/vdsomunge
> arch/arm/kernel/vdso/vdsomunge.c: In function ?main?:
> arch/arm/kernel/vdso/vdsomunge.c:152:16: error: ?EF_ARM_ABI_FLOAT_HARD? undeclared (first use in this function)
> arch/arm/kernel/vdso/vdsomunge.c:152:16: note: each undeclared identifier is reported only once for each function it appears in
> arch/arm/kernel/vdso/vdsomunge.c:156:34: error: ?EF_ARM_ABI_FLOAT_SOFT? undeclared (first use in this function)
> make[2]: *** [arch/arm/kernel/vdso/vdsomunge] Error 1
> make[1]: *** [arch/arm/kernel/vdso] Error 2
> make: *** [arch/arm/kernel] Error 2
> 
> Looks like the libc dev is too old (EF_ARM_ABI_FLOAT_* not in
> /usr/include/elf.h). On a more recent Ubuntu it compiles fine.
> Not sure how to solve this, maybe disable vdso if the libc is too old?

This is what really concerns me about the VDSO.  It adds an additional
dependence on the C library in order to build the kernel.  What if you
don't have a C library in your cross-build setup (I don't.)

Until that is solved, the VDSO support is not going in, as it will
effectively render the kernel unbuildable for me.

-- 
FTTC broadband for 0.8mile line: now at 9.7Mbps down 460kbps up... slowly
improving, and getting towards what was expected from it.

  reply	other threads:[~2014-06-27  8:57 UTC|newest]

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-23  3:11 [PATCH v7 0/9] ARM: VDSO Nathan Lynch
2014-06-23  3:11 ` [PATCH v7 1/9] clocksource: arm_arch_timer: change clocksource name if CP15 unavailable Nathan Lynch
2014-06-23  3:11 ` [PATCH v7 2/9] clocksource: arm_arch_timer: enable counter access for 32-bit ARM Nathan Lynch
2014-06-23  3:11 ` [PATCH v7 3/9] ARM: arch_timer: remove unused functions Nathan Lynch
2014-06-23  3:11 ` [PATCH v7 4/9] arm64: " Nathan Lynch
2014-06-23  3:11 ` [PATCH v7 5/9] ARM: place sigpage at a random offset above stack Nathan Lynch
2014-06-23  3:11 ` [PATCH v7 6/9] ARM: miscellaneous vdso infrastructure, preparation Nathan Lynch
2014-06-30 10:11   ` Arnd Bergmann
2014-06-30 12:27     ` Nathan Lynch
2014-06-30 13:06       ` Arnd Bergmann
2014-06-23  3:11 ` [PATCH v7 7/9] ARM: add vdso user-space code Nathan Lynch
2014-06-28  9:53   ` Russell King - ARM Linux
2014-06-28 10:03     ` Russell King - ARM Linux
2014-06-30 15:56       ` Andy Lutomirski
2014-06-28 15:19     ` Nathan Lynch
2014-06-28 15:26   ` Russell King - ARM Linux
2014-06-28 16:13     ` Nathan Lynch
2014-06-28 18:12       ` Russell King - ARM Linux
2014-06-28 19:45         ` Nathan Lynch
2014-06-28 20:11           ` Russell King - ARM Linux
2014-06-28 21:35             ` Nathan Lynch
2014-06-29  8:34               ` Russell King - ARM Linux
2014-06-29 15:48                 ` Nathan Lynch
2014-06-29 16:07                   ` Russell King - ARM Linux
2014-06-29 23:04                     ` Nathan Lynch
2014-06-30 21:33                     ` Andy Lutomirski
2014-06-30 15:59     ` Andy Lutomirski
2014-06-30 16:50       ` Nathan Lynch
2014-06-30 21:29   ` Andy Lutomirski
2014-07-01  9:00     ` Will Deacon
2014-07-01 13:34       ` Nathan Lynch
2014-07-01 14:11         ` Andy Lutomirski
2014-07-01 13:28     ` Nathan Lynch
2014-07-01 14:56       ` Andy Lutomirski
2014-06-23  3:11 ` [PATCH v7 8/9] ARM: vdso initialization, mapping, and synchronization Nathan Lynch
2014-06-30 21:37   ` Andy Lutomirski
2014-07-01  9:03     ` Will Deacon
2014-07-01 14:11       ` Nathan Lynch
2014-07-01 14:15         ` Will Deacon
2014-07-01 14:17           ` Andy Lutomirski
2014-07-01 17:27             ` Christopher Covington
2014-07-02 14:40             ` Will Deacon
2014-07-02 15:54               ` Andy Lutomirski
2014-07-02 16:18                 ` Nathan Lynch
2014-07-02 16:27                   ` Will Deacon
2014-07-02 16:47                     ` Andy Lutomirski
2014-07-02 17:24                       ` Will Deacon
2014-07-02 18:34                         ` Andy Lutomirski
2014-07-02 18:54                           ` Will Deacon
2014-07-22  0:14                             ` Andy Lutomirski
2014-07-22  8:13                               ` Will Deacon
2014-07-01 14:01     ` Nathan Lynch
2014-07-01 14:09       ` Andy Lutomirski
2014-07-01 14:14         ` Russell King - ARM Linux
2014-06-23  3:11 ` [PATCH v7 9/9] ARM: add CONFIG_VDSO Kconfig and Makefile bits Nathan Lynch
2014-06-27  8:51 ` [PATCH v7 0/9] ARM: VDSO Jan Glauber
2014-06-27  8:57   ` Russell King - ARM Linux [this message]
2014-06-27  9:41     ` Ard Biesheuvel
2014-06-27  9:46       ` Russell King - ARM Linux
2014-06-27 17:01         ` Nathan Lynch
2014-06-28  9:42           ` Russell King - ARM Linux
2014-06-28  9:55             ` Russell King - ARM Linux
2014-06-28 14:49               ` Russell King - ARM Linux
2014-06-30  7:27                 ` Arnd Bergmann
2014-06-30  7:43             ` Arnd Bergmann
2014-06-30 18:27               ` Nathan Lynch
2014-06-27 16:00   ` Nathan Lynch
2014-06-30 16:03   ` Andy Lutomirski
2014-06-30  8:12 ` Ard Biesheuvel
2014-07-01 16:34   ` Nathan Lynch
2014-07-01 20:08     ` Ard Biesheuvel
2014-07-01 22:44       ` Russell King - ARM Linux
2014-06-30 14:40 ` Will Deacon
2014-06-30 15:42   ` Nathan Lynch
2014-06-30 21:56     ` Andy Lutomirski
2014-07-01  9:04       ` Will Deacon

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