From: Vincenzo Frascino <vincenzo.frascino@arm.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: ard.biesheuvel@linaro.org, ndesaulniers@google.com,
linux-kernel@vger.kernel.org, tglx@linutronix.de,
will@kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 1/4] arm64: vdso32: Introduce COMPAT_CC_IS_GCC
Date: Thu, 26 Sep 2019 13:22:01 +0100 [thread overview]
Message-ID: <ad90f9bb-aa39-615c-3ae5-bea394bd787c@arm.com> (raw)
In-Reply-To: <0ff3d5f4-11c9-4207-c6ab-2f8e9ee7de5e@arm.com>
On 9/26/19 11:56 AM, Vincenzo Frascino wrote:
> On 9/26/19 9:06 AM, Catalin Marinas wrote:
>> On Thu, Sep 26, 2019 at 07:03:50AM +0100, Vincenzo Frascino wrote:
>>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>>> index 37c610963eee..afe8c948b493 100644
>>> --- a/arch/arm64/Kconfig
>>> +++ b/arch/arm64/Kconfig
>>> @@ -110,7 +110,7 @@ config ARM64
>>> select GENERIC_STRNLEN_USER
>>> select GENERIC_TIME_VSYSCALL
>>> select GENERIC_GETTIMEOFDAY
>>> - select GENERIC_COMPAT_VDSO if (!CPU_BIG_ENDIAN && COMPAT)
>>> + select GENERIC_COMPAT_VDSO if (!CPU_BIG_ENDIAN && COMPAT && COMPAT_CC_IS_GCC)
>>> select HANDLE_DOMAIN_IRQ
>>> select HARDIRQS_SW_RESEND
>>> select HAVE_PCI
>>> @@ -313,6 +313,9 @@ config KASAN_SHADOW_OFFSET
>>> default 0xeffffff900000000 if ARM64_VA_BITS_36 && KASAN_SW_TAGS
>>> default 0xffffffffffffffff
>>>
>>> +config COMPAT_CC_IS_GCC
>>> + def_bool $(success,$(CROSS_COMPILE_COMPAT)gcc --version | head -n 1 | grep -q arm)
>>
>> Nitpick: I prefer COMPATCC instead of COMPAT_CC for consistency with
>> HOSTCC.
>>
>
> Ok, will change this in v2.
>
>> Now, could we not generate a COMPATCC in the Makefile and use
>> $(COMPATCC) here instead of $(CROSS_COMPILE_COMPAT)gcc? It really
>> doesn't make sense to check that gcc is gcc.
>>
>
> All right, COMPATCC is already in the makefile, I will use it in here.
>
What you are proposing seems not possible because Kconfig runs first and then
the arch Makefile, hence compatcc does not take effect on the Kconfig. I will
post v2 with what I proposed, please feel free to comment if you have a better idea.
arch/arm64/configs/defconfig:726:warning: symbol value 'm' invalid for
REMOTEPROC
#
# configuration written to .config
#
make[1]: Leaving directory '/data1/Projects/LinuxKernel/linux-out'
make[1]: Entering directory '/data1/Projects/LinuxKernel/linux-out'
$COMPATCC is [arm-linux-gnueabihf-gcc]
GEN Makefile
>> A next step would be to check that COMPATCC can actually generate 32-bit
>> objects. But it's not essential at this stage.
>>
>
> We are already checking this making sure that arm is present in the triple (grep
> -q arm).
>
>>> diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
>>> index 84a3d502c5a5..34f53eb11878 100644
>>> --- a/arch/arm64/Makefile
>>> +++ b/arch/arm64/Makefile
>>> @@ -54,19 +54,8 @@ $(warning Detected assembler with broken .inst; disassembly will be unreliable)
>>> endif
>>>
>>> ifeq ($(CONFIG_GENERIC_COMPAT_VDSO), y)
>>> - CROSS_COMPILE_COMPAT ?= $(CONFIG_CROSS_COMPILE_COMPAT_VDSO:"%"=%)
>>> -
>>> - ifeq ($(CONFIG_CC_IS_CLANG), y)
>>> - $(warning CROSS_COMPILE_COMPAT is clang, the compat vDSO will not be built)
>>> - else ifeq ($(strip $(CROSS_COMPILE_COMPAT)),)
>>> - $(warning CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built)
>>> - else ifeq ($(shell which $(CROSS_COMPILE_COMPAT)gcc 2> /dev/null),)
>>> - $(error $(CROSS_COMPILE_COMPAT)gcc not found, check CROSS_COMPILE_COMPAT)
>>> - else
>>> - export CROSS_COMPILE_COMPAT
>>> - export CONFIG_COMPAT_VDSO := y
>>> - compat_vdso := -DCONFIG_COMPAT_VDSO=1
>>> - endif
>>> + export CONFIG_COMPAT_VDSO := y
>>> + compat_vdso := -DCONFIG_COMPAT_VDSO=1
>>> endif
>>
>> Has CONFIG_CROSS_COMPILE_COMPAT_VDSO actually been removed from
>> lib/vdso/Kconfig? (I haven't checked the subsequent patches).
>>
>
--
Regards,
Vincenzo
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next prev parent reply other threads:[~2019-09-26 12:20 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190920142738.qlsjwguc6bpnez63@willie-the-truck>
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 [this message]
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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