From: Masahiro Yamada <masahiroy@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
Kees Cook <keescook@chromium.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Richard Henderson <richard.henderson@linaro.org>,
Kristina Martsenko <kristina.martsenko@arm.com>,
Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
James Morse <james.morse@arm.com>,
Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>,
Amit Daniel Kachhap <amit.kachhap@arm.com>,
Mark Brown <Mark.Brown@arm.com>,
Vincenzo Frascino <Vincenzo.Frascino@arm.com>,
Will Deacon <will@kernel.org>, Dave Martin <Dave.Martin@arm.com>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v3 14/16] kconfig: Add support for 'as-option'
Date: Sat, 18 Jan 2020 02:51:31 +0900 [thread overview]
Message-ID: <CAK7LNASyrra9Xxvk+aG5OspbxmenDvohBVfusokD0RHy4CvqFg@mail.gmail.com> (raw)
In-Reply-To: <20200117113351.GF26090@arrakis.emea.arm.com>
On Fri, Jan 17, 2020 at 8:33 PM Catalin Marinas <catalin.marinas@arm.com> wrote:
>
> On Mon, Dec 16, 2019 at 02:17:16PM +0530, Amit Daniel Kachhap wrote:
> > diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
> > index d4adfbe..cc465dd 100644
> > --- a/scripts/Kconfig.include
> > +++ b/scripts/Kconfig.include
> > @@ -31,6 +31,10 @@ cc-option = $(success,$(CC) -Werror $(CLANG_FLAGS) $(1) -E -x c /dev/null -o /de
> > # Return y if the linker supports <flag>, n otherwise
> > ld-option = $(success,$(LD) -v $(1))
> >
> > +# $(as-option,<flag>)
> > +# Return y if the assembler supports <flag>, n otherwise
> > +as-option = $(success, $(CC) $(CLANG_FLAGS) $(1) -E -x assembler /dev/null -o /dev/null)
>
> I had different experiments with this for MTE and noticed that clang
> does not honour the -Wa, option (which you use in a subsequent patch).
> So not sure how useful as-option is.
I think this is because it uses '-E' option.
To invoke the assembler, -c is needed.
I replaced -E with -c, and tested it.
It seems working for both gcc and clang.
I noticed a similar case for cc-option:
https://patchwork.kernel.org/patch/11339567/
--
Best Regards
Masahiro Yamada
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next prev parent reply other threads:[~2020-01-17 17:52 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-16 8:47 [PATCH v3 00/16] arm64: return address signing Amit Daniel Kachhap
2019-12-16 8:47 ` [PATCH v3 01/16] arm64: cpufeature: add pointer auth meta-capabilities Amit Daniel Kachhap
2020-01-15 12:26 ` Catalin Marinas
2020-01-15 13:52 ` Suzuki Kuruppassery Poulose
2020-01-15 16:01 ` Catalin Marinas
2020-01-16 12:35 ` Amit Kachhap
2019-12-16 8:47 ` [PATCH v3 02/16] arm64: rename ptrauth key structures to be user-specific Amit Daniel Kachhap
2020-01-15 16:42 ` Catalin Marinas
2019-12-16 8:47 ` [PATCH v3 03/16] arm64: install user ptrauth keys at kernel exit time Amit Daniel Kachhap
2020-01-15 17:02 ` Catalin Marinas
2020-01-16 12:39 ` Amit Kachhap
2019-12-16 8:47 ` [PATCH v3 04/16] arm64: create macro to park cpu in an infinite loop Amit Daniel Kachhap
2020-01-07 11:13 ` Suzuki Kuruppassery Poulose
2020-01-15 17:03 ` Catalin Marinas
2019-12-16 8:47 ` [PATCH v3 05/16] arm64: ptrauth: Add bootup/runtime flags for __cpu_setup Amit Daniel Kachhap
2020-01-07 11:18 ` Suzuki Kuruppassery Poulose
2020-01-09 8:33 ` Amit Kachhap
2020-01-15 17:30 ` Catalin Marinas
2020-01-16 12:40 ` Amit Kachhap
2019-12-16 8:47 ` [PATCH v3 06/16] arm64: enable ptrauth earlier Amit Daniel Kachhap
2020-01-07 11:35 ` Suzuki Kuruppassery Poulose
2020-01-09 8:29 ` Amit Kachhap
2020-01-10 10:18 ` Suzuki Kuruppassery Poulose
2020-01-16 16:24 ` Catalin Marinas
2020-01-17 10:43 ` Amit Kachhap
2020-01-17 12:00 ` Catalin Marinas
2020-01-20 14:27 ` Amit Kachhap
2019-12-16 8:47 ` [PATCH v3 07/16] arm64: initialize and switch ptrauth kernel keys Amit Daniel Kachhap
2020-01-16 18:00 ` Catalin Marinas
2019-12-16 8:47 ` [PATCH v3 08/16] arm64: initialize ptrauth keys for kernel booting task Amit Daniel Kachhap
2020-01-16 17:59 ` Catalin Marinas
2020-01-20 10:50 ` Amit Kachhap
2019-12-16 8:47 ` [PATCH v3 09/16] arm64: mask PAC bits of __builtin_return_address Amit Daniel Kachhap
2020-01-17 10:14 ` Catalin Marinas
2020-01-20 14:20 ` Amit Kachhap
2020-01-21 16:52 ` Catalin Marinas
2019-12-16 8:47 ` [PATCH v3 10/16] arm64: unwind: strip PAC from kernel addresses Amit Daniel Kachhap
2020-01-17 10:22 ` Catalin Marinas
2019-12-16 8:47 ` [PATCH v3 11/16] arm64: __show_regs: strip PAC from lr in printk Amit Daniel Kachhap
2020-01-17 10:25 ` Catalin Marinas
2019-12-16 8:47 ` [PATCH v3 12/16] arm64: suspend: restore the kernel ptrauth keys Amit Daniel Kachhap
2020-01-17 10:31 ` Catalin Marinas
2019-12-16 8:47 ` [PATCH v3 13/16] arm64: kprobe: disable probe of ptrauth instruction Amit Daniel Kachhap
2020-01-17 11:16 ` Catalin Marinas
2020-01-20 14:24 ` Amit Kachhap
2019-12-16 8:47 ` [PATCH v3 14/16] kconfig: Add support for 'as-option' Amit Daniel Kachhap
2019-12-17 11:43 ` Masahiro Yamada
2020-01-17 11:33 ` Catalin Marinas
2020-01-17 17:51 ` Masahiro Yamada [this message]
2020-01-20 10:26 ` Vincenzo Frascino
2019-12-16 8:47 ` [PATCH v3 15/16] arm64: compile the kernel with ptrauth return address signing Amit Daniel Kachhap
2020-01-17 11:49 ` Catalin Marinas
2020-01-21 14:37 ` Amit Kachhap
2020-01-21 14:46 ` Vincenzo Frascino
2020-01-21 16:50 ` Catalin Marinas
2019-12-16 8:47 ` [PATCH v3 16/16] lkdtm: arm64: test kernel pointer authentication Amit Daniel Kachhap
2020-01-17 11:53 ` Catalin Marinas
2019-12-16 9:35 ` [RESEND PATCH v3 00/16] arm64: return address signing Amit Daniel Kachhap
2019-12-30 19:09 ` [PATCH " Kees Cook
2020-01-07 11:07 ` Amit Kachhap
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