From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Will Deacon <will@kernel.org>,
linux-kernel@lists.infradead.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>
Subject: Re: Problems with arm64 compat vdso
Date: Mon, 23 Sep 2019 18:41:31 +0200 [thread overview]
Message-ID: <CAKv+Gu9EvwM22HaFJvX55HQhptcNUoQZCxq3nxyzquUjcq6DUg@mail.gmail.com> (raw)
In-Reply-To: <7f05a25a-36c7-929c-484d-bc964587917c@arm.com>
On Fri, 20 Sep 2019 at 18:33, Vincenzo Frascino
<vincenzo.frascino@arm.com> wrote:
>
> Hi Will,
>
> thank you for reporting this.
>
> On 20/09/2019 15:27, Will Deacon wrote:
> > Hi Vincenzo,
> >
> > I've been running into a few issues with the COMPAT vDSO. Please could
> > you have a look?
> >
>
> I will be at Linux Recipes next week. I will look at this with priority when I
> come back.
>
Hi all,
I noticed another issue: I build out of tree, and the VDSO gets
rebuilt every time I build the kernel, even if I haven't made any
changes to the source tree at all.
Could you please look into that as well? (once you get around to it)
Thanks,
Ard.
> > If I do the following:
> >
> > $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- defconfig
> > [...]
> > $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- menuconfig
> > [set CONFIG_CROSS_COMPILE_COMPAT_VDSO="arm-linux-gnueabihf-"]
> > $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu-
> >
> > Then I see the following warning:
> >
> > arch/arm64/Makefile:62: CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built
> >
> > even though the compat vDSO *has* been built:
> >
> > $ file arch/arm64/kernel/vdso32/vdso.so
> > arch/arm64/kernel/vdso32/vdso.so: ELF 32-bit LSB pie executable, ARM, EABI5 version 1 (SYSV), dynamically linked, BuildID[sha1]=c67f6c786f2d2d6f86c71f708595594aa25247f6, stripped
> >
> > However, I also get some warnings because arm64 headers are being included
> > in the compat vDSO build:
> >
> > In file included from ./arch/arm64/include/asm/thread_info.h:17:0,
> > from ./include/linux/thread_info.h:38,
> > from ./arch/arm64/include/asm/preempt.h:5,
> > from ./include/linux/preempt.h:78,
> > from ./include/linux/spinlock.h:51,
> > from ./include/linux/seqlock.h:36,
> > from ./include/linux/time.h:6,
> > from /usr/local/google/home/willdeacon/work/linux/lib/vdso/gettimeofday.c:7,
> > from <command-line>:0:
> > ./arch/arm64/include/asm/memory.h: In function ‘__tag_set’:
> > ./arch/arm64/include/asm/memory.h:233:15: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
> > u64 __addr = (u64)addr & ~__tag_shifted(0xff);
> > ^
> > In file included from ./arch/arm64/include/asm/pgtable-hwdef.h:8:0,
> > from ./arch/arm64/include/asm/processor.h:34,
> > from ./arch/arm64/include/asm/elf.h:118,
> > from ./include/linux/elf.h:5,
> > from ./include/linux/elfnote.h:62,
> > from arch/arm64/kernel/vdso32/note.c:11:
> > ./arch/arm64/include/asm/memory.h: In function ‘__tag_set’:
> > ./arch/arm64/include/asm/memory.h:233:15: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
> > u64 __addr = (u64)addr & ~__tag_shifted(0xff);
> > ^
> > Worse, if your compat binutils isn't up-to-date, you'll actually run into
> > a build failure:
> >
> > /tmp/ccFCrjUg.s:80: Error: invalid barrier type -- `dmb ishld'
> > /tmp/ccFCrjUg.s:124: Error: invalid barrier type -- `dmb ishld'
> >
> > There also appears to be a problem getting the toolchain prefix from Kconfig.
> > If, for example, I do:
> >
> > $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- defconfig
> > [...]
> > $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- menuconfig
> > [set CONFIG_CROSS_COMPILE_COMPAT_VDSO="vincenzo"]
> > $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu-
> > arch/arm64/Makefile:64: *** vincenzogcc not found, check CROSS_COMPILE_COMPAT. Stop.
> > $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- menuconfig
> > [set CONFIG_CROSS_COMPILE_COMPAT_VDSO="arm-linux-gnueabihf-"]
> > $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu-
> > arch/arm64/Makefile:64: *** vincenzogcc not found, check CROSS_COMPILE_COMPAT. Stop.
> > $ grep CONFIG_CROSS_COMPILE_COMPAT_VDSO .config
> > CONFIG_CROSS_COMPILE_COMPAT_VDSO="arm-linux-gnueabihf-"
> >
> > which is irritating, because it seems to force a 'mrproper' if you don't
> > get the prefix right first time.
> >
> > Cheers,
> >
> > Will
> >
>
> --
> Regards,
> Vincenzo
next prev parent reply other threads:[~2019-09-23 16:41 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-20 14:27 Problems with arm64 compat vdso Will Deacon
2019-09-20 16:33 ` Vincenzo Frascino
2019-09-23 16:41 ` Ard Biesheuvel [this message]
2019-09-24 12:11 ` Vincenzo Frascino
2019-09-24 18:06 ` Nick Desaulniers
2019-09-24 20:42 ` Vincenzo Frascino
2019-09-25 15:58 ` Ard Biesheuvel
2019-09-26 6:03 ` [PATCH 0/4] arm64: vdso32: Address various issues Vincenzo Frascino
2019-09-26 6:03 ` [PATCH 1/4] arm64: vdso32: Introduce COMPAT_CC_IS_GCC Vincenzo Frascino
2019-09-26 8:06 ` Catalin Marinas
2019-09-26 10:56 ` Vincenzo Frascino
2019-09-26 11:02 ` Vincenzo Frascino
2019-09-26 15:23 ` Catalin Marinas
2019-09-26 12:22 ` Vincenzo Frascino
2019-09-26 15:17 ` Catalin Marinas
2019-09-26 20:17 ` Vincenzo Frascino
2019-09-26 6:03 ` [PATCH 2/4] arm64: vdso32: Detect binutils support for dmb ishld Vincenzo Frascino
2019-09-26 8:30 ` Catalin Marinas
2019-09-26 10:59 ` Vincenzo Frascino
2019-09-26 6:03 ` [PATCH 3/4] arm64: vdso32: Fix compilation warning Vincenzo Frascino
2019-09-26 8:32 ` Catalin Marinas
2019-09-26 11:03 ` Vincenzo Frascino
2019-09-26 6:03 ` [PATCH 4/4] arm64: Remove gettimeofday.S Vincenzo Frascino
2019-09-26 8:34 ` Catalin Marinas
2019-09-26 13:38 ` [PATCH v2 0/4] arm64: vdso32: Address various issues Vincenzo Frascino
2019-09-26 13:38 ` [PATCH v2 1/4] arm64: vdso32: Introduce COMPAT_CC_IS_GCC Vincenzo Frascino
2019-09-26 15:13 ` Catalin Marinas
2019-09-26 13:38 ` [PATCH v2 2/4] arm64: vdso32: Detect binutils support for dmb ishld Vincenzo Frascino
2019-09-26 14:26 ` Catalin Marinas
2019-09-26 20:19 ` Vincenzo Frascino
2019-09-26 15:59 ` Catalin Marinas
2019-09-26 21:17 ` Vincenzo Frascino
2019-09-26 16:23 ` Nick Desaulniers
2019-09-26 13:38 ` [PATCH v2 3/4] arm64: vdso32: Fix compilation warning Vincenzo Frascino
2019-09-26 15:22 ` Catalin Marinas
2019-09-26 13:38 ` [PATCH v2 4/4] arm64: Remove gettimeofday.S Vincenzo Frascino
2019-09-26 15:31 ` [PATCH v2 0/4] arm64: vdso32: Address various issues Catalin Marinas
2019-09-26 20:29 ` Vincenzo Frascino
2019-09-26 21:43 ` [PATCH v3 0/5]arm64: " Vincenzo Frascino
2019-09-26 21:43 ` [PATCH v3 1/5] arm64: vdso32: Introduce COMPAT_CC_IS_GCC Vincenzo Frascino
2019-09-27 9:24 ` Catalin Marinas
2019-10-01 13:14 ` Will Deacon
2019-10-01 13:27 ` Catalin Marinas
2019-10-01 14:20 ` Vincenzo Frascino
2019-10-01 14:20 ` Will Deacon
2019-10-01 14:37 ` Vincenzo Frascino
2019-10-01 14:43 ` Will Deacon
2019-10-01 14:59 ` Vincenzo Frascino
2019-10-01 15:30 ` Catalin Marinas
2019-10-01 16:46 ` Will Deacon
2019-10-01 16:59 ` Nick Desaulniers
2019-10-01 17:07 ` Will Deacon
2019-10-01 17:12 ` Nick Desaulniers
2019-10-01 17:14 ` Will Deacon
2019-09-26 21:43 ` [PATCH v3 2/5] arm64: vdso32: Detect binutils support for dmb ishld Vincenzo Frascino
2019-09-27 9:25 ` Catalin Marinas
2019-10-01 13:26 ` Will Deacon
2019-10-01 14:23 ` Vincenzo Frascino
2019-09-26 21:43 ` [PATCH v3 3/5] arm64: vdso32: Fix compilation warning Vincenzo Frascino
2019-09-27 9:26 ` Catalin Marinas
2019-10-01 13:21 ` Will Deacon
2019-10-01 14:41 ` Vincenzo Frascino
2019-09-26 21:43 ` [PATCH v3 4/5] arm64: Remove gettimeofday.S Vincenzo Frascino
2019-09-26 21:43 ` [PATCH v3 5/5] arm64: vdso32: Remove jump label config option in Makefile Vincenzo Frascino
2019-09-27 9:27 ` Catalin Marinas
2019-09-27 10:46 ` [PATCH v3 0/5]arm64: vdso32: Address various issues Catalin Marinas
2019-10-01 13:27 ` Will Deacon
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