From: Nick Desaulniers <ndesaulniers@google.com> To: Russell King <rmk+kernel@armlinux.org.uk> Cc: Arnd Bergmann <arnd@arndb.de>, Ard Biesheuvel <ardb@kernel.org>, Masahiro Yamada <masahiroy@kernel.org>, Linus Walleij <linus.walleij@linaro.org>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Nathan Chancellor <nathan@kernel.org>, Nick Desaulniers <ndesaulniers@google.com> Subject: [PATCH v4 0/4] pass -march= only to compiler Date: Fri, 14 Oct 2022 13:13:50 -0700 [thread overview] Message-ID: <20221014201354.3190007-1-ndesaulniers@google.com> (raw) When both -march= and -Wa,-march= are specified for assembler or assembler-with-cpp sources, GCC and Clang will prefer the -Wa,-march= value but Clang will warn that -march= is unused. warning: argument unused during compilation: '-march=armv6k' [-Wunused-command-line-argument] This is the top group of warnings we observe when using clang to assemble the kernel via `ARCH=arm make LLVM=1`. Arnd sent a v2 of my previous patch https://lore.kernel.org/linux-arm-kernel/20210928154143.2106903-14-arnd@kernel.org/ I added yet a few more instances I found since then. Nathan pointed out a new one too that I've fixed since v3. Fixing this will allow us to enable -Werror=unused-command-line-argument for clang builds. v3 had an issue wrt. __thumb2__ https://lore.kernel.org/llvm/CAKwvOdmkd2PxvMUZA=A-72eATGDZkqDj--Bv1W+Xt_K_LWdROA@mail.gmail.com/ I've incorporated idea from Nathan and Ard on that. Nick Desaulniers (4): ARM: remove lazy evaluation in Makefile ARM: use .arch directives instead of assembler command line flags ARM: only use -mtp=cp15 for the compiler ARM: pass -march= only to compiler arch/arm/Makefile | 78 ++++++++++++++++------------- arch/arm/boot/compressed/Makefile | 1 - arch/arm/common/Makefile | 2 - arch/arm/common/mcpm_head.S | 2 + arch/arm/common/vlock.S | 2 + arch/arm/kernel/Makefile | 2 - arch/arm/kernel/hyp-stub.S | 2 + arch/arm/kernel/swp_emulate.c | 1 + arch/arm/lib/Makefile | 4 -- arch/arm/lib/delay-loop.S | 4 ++ arch/arm/mach-at91/Makefile | 3 -- arch/arm/mach-at91/pm_suspend.S | 4 ++ arch/arm/mach-imx/Makefile | 3 -- arch/arm/mach-imx/headsmp.S | 2 + arch/arm/mach-imx/resume-imx6.S | 2 + arch/arm/mach-imx/suspend-imx6.S | 2 + arch/arm/mach-mvebu/Makefile | 3 -- arch/arm/mach-mvebu/coherency_ll.S | 1 + arch/arm/mach-mvebu/pmsu.c | 1 + arch/arm/mach-npcm/Makefile | 2 - arch/arm/mach-npcm/headsmp.S | 2 + arch/arm/mach-tegra/Makefile | 2 - arch/arm/mach-tegra/reset-handler.S | 2 + arch/arm/mach-tegra/sleep-tegra20.S | 2 + arch/arm/mach-tegra/sleep-tegra30.S | 2 + arch/arm/mach-tegra/sleep.S | 2 + arch/arm/mm/Makefile | 15 ------ arch/arm/mm/abort-ev6.S | 1 + arch/arm/mm/abort-ev7.S | 1 + arch/arm/mm/cache-v6.S | 2 + arch/arm/mm/cache-v7.S | 2 + arch/arm/mm/cache-v7m.S | 2 + arch/arm/mm/copypage-feroceon.c | 1 + arch/arm/mm/proc-v6.S | 2 + arch/arm/mm/proc-v7-2level.S | 2 + arch/arm/mm/proc-v7.S | 2 + arch/arm/mm/tlb-v6.S | 2 + arch/arm/mm/tlb-v7.S | 2 + drivers/memory/Makefile | 2 - drivers/memory/ti-emif-sram-pm.S | 1 + drivers/soc/bcm/brcmstb/pm/Makefile | 1 - drivers/soc/bcm/brcmstb/pm/s2-arm.S | 1 + 42 files changed, 97 insertions(+), 75 deletions(-) -- 2.38.0.413.g74048e4d9e-goog
WARNING: multiple messages have this Message-ID (diff)
From: Nick Desaulniers <ndesaulniers@google.com> To: Russell King <rmk+kernel@armlinux.org.uk> Cc: Arnd Bergmann <arnd@arndb.de>, Ard Biesheuvel <ardb@kernel.org>, Masahiro Yamada <masahiroy@kernel.org>, Linus Walleij <linus.walleij@linaro.org>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Nathan Chancellor <nathan@kernel.org>, Nick Desaulniers <ndesaulniers@google.com> Subject: [PATCH v4 0/4] pass -march= only to compiler Date: Fri, 14 Oct 2022 13:13:50 -0700 [thread overview] Message-ID: <20221014201354.3190007-1-ndesaulniers@google.com> (raw) When both -march= and -Wa,-march= are specified for assembler or assembler-with-cpp sources, GCC and Clang will prefer the -Wa,-march= value but Clang will warn that -march= is unused. warning: argument unused during compilation: '-march=armv6k' [-Wunused-command-line-argument] This is the top group of warnings we observe when using clang to assemble the kernel via `ARCH=arm make LLVM=1`. Arnd sent a v2 of my previous patch https://lore.kernel.org/linux-arm-kernel/20210928154143.2106903-14-arnd@kernel.org/ I added yet a few more instances I found since then. Nathan pointed out a new one too that I've fixed since v3. Fixing this will allow us to enable -Werror=unused-command-line-argument for clang builds. v3 had an issue wrt. __thumb2__ https://lore.kernel.org/llvm/CAKwvOdmkd2PxvMUZA=A-72eATGDZkqDj--Bv1W+Xt_K_LWdROA@mail.gmail.com/ I've incorporated idea from Nathan and Ard on that. Nick Desaulniers (4): ARM: remove lazy evaluation in Makefile ARM: use .arch directives instead of assembler command line flags ARM: only use -mtp=cp15 for the compiler ARM: pass -march= only to compiler arch/arm/Makefile | 78 ++++++++++++++++------------- arch/arm/boot/compressed/Makefile | 1 - arch/arm/common/Makefile | 2 - arch/arm/common/mcpm_head.S | 2 + arch/arm/common/vlock.S | 2 + arch/arm/kernel/Makefile | 2 - arch/arm/kernel/hyp-stub.S | 2 + arch/arm/kernel/swp_emulate.c | 1 + arch/arm/lib/Makefile | 4 -- arch/arm/lib/delay-loop.S | 4 ++ arch/arm/mach-at91/Makefile | 3 -- arch/arm/mach-at91/pm_suspend.S | 4 ++ arch/arm/mach-imx/Makefile | 3 -- arch/arm/mach-imx/headsmp.S | 2 + arch/arm/mach-imx/resume-imx6.S | 2 + arch/arm/mach-imx/suspend-imx6.S | 2 + arch/arm/mach-mvebu/Makefile | 3 -- arch/arm/mach-mvebu/coherency_ll.S | 1 + arch/arm/mach-mvebu/pmsu.c | 1 + arch/arm/mach-npcm/Makefile | 2 - arch/arm/mach-npcm/headsmp.S | 2 + arch/arm/mach-tegra/Makefile | 2 - arch/arm/mach-tegra/reset-handler.S | 2 + arch/arm/mach-tegra/sleep-tegra20.S | 2 + arch/arm/mach-tegra/sleep-tegra30.S | 2 + arch/arm/mach-tegra/sleep.S | 2 + arch/arm/mm/Makefile | 15 ------ arch/arm/mm/abort-ev6.S | 1 + arch/arm/mm/abort-ev7.S | 1 + arch/arm/mm/cache-v6.S | 2 + arch/arm/mm/cache-v7.S | 2 + arch/arm/mm/cache-v7m.S | 2 + arch/arm/mm/copypage-feroceon.c | 1 + arch/arm/mm/proc-v6.S | 2 + arch/arm/mm/proc-v7-2level.S | 2 + arch/arm/mm/proc-v7.S | 2 + arch/arm/mm/tlb-v6.S | 2 + arch/arm/mm/tlb-v7.S | 2 + drivers/memory/Makefile | 2 - drivers/memory/ti-emif-sram-pm.S | 1 + drivers/soc/bcm/brcmstb/pm/Makefile | 1 - drivers/soc/bcm/brcmstb/pm/s2-arm.S | 1 + 42 files changed, 97 insertions(+), 75 deletions(-) -- 2.38.0.413.g74048e4d9e-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2022-10-14 20:14 UTC|newest] Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-10-14 20:13 Nick Desaulniers [this message] 2022-10-14 20:13 ` [PATCH v4 0/4] pass -march= only to compiler Nick Desaulniers 2022-10-14 20:13 ` [PATCH v4 1/4] ARM: remove lazy evaluation in Makefile Nick Desaulniers 2022-10-14 20:13 ` Nick Desaulniers 2022-10-14 21:18 ` Nathan Chancellor 2022-10-14 21:18 ` Nathan Chancellor 2022-10-14 20:13 ` [PATCH v4 2/4] ARM: use .arch directives instead of assembler command line flags Nick Desaulniers 2022-10-14 20:13 ` Nick Desaulniers 2022-10-14 21:19 ` Nathan Chancellor 2022-10-14 21:19 ` Nathan Chancellor 2022-11-08 18:30 ` Nathan Chancellor 2022-11-08 18:30 ` Nathan Chancellor 2022-11-08 18:37 ` Russell King (Oracle) 2022-11-08 18:37 ` Russell King (Oracle) 2022-11-08 18:40 ` Nathan Chancellor 2022-11-08 18:40 ` Nathan Chancellor 2022-10-14 20:13 ` [PATCH v4 3/4] ARM: only use -mtp=cp15 for the compiler Nick Desaulniers 2022-10-14 20:13 ` Nick Desaulniers 2022-10-14 21:20 ` Nathan Chancellor 2022-10-14 21:20 ` Nathan Chancellor 2022-10-14 20:13 ` [PATCH v4 4/4] ARM: pass -march= only to compiler Nick Desaulniers 2022-10-14 20:13 ` Nick Desaulniers 2022-10-14 21:21 ` Nathan Chancellor 2022-10-14 21:21 ` Nathan Chancellor 2022-10-14 20:16 ` [PATCH v4 0/4] " Nick Desaulniers 2022-10-14 20:16 ` Nick Desaulniers
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20221014201354.3190007-1-ndesaulniers@google.com \ --to=ndesaulniers@google.com \ --cc=ardb@kernel.org \ --cc=arnd@arndb.de \ --cc=linus.walleij@linaro.org \ --cc=linux-arm-kernel@lists.infradead.org \ --cc=linux-kernel@vger.kernel.org \ --cc=llvm@lists.linux.dev \ --cc=masahiroy@kernel.org \ --cc=nathan@kernel.org \ --cc=rmk+kernel@armlinux.org.uk \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.