Re: [PATCH v3 2/4] ARM: use .arch directives instead of assembler command line flags

Nick Desaulniers
2022-05-16T21:15:52Z

+ Ard (I messed up my command line invocation of git send-email, sorry
for more noise)
https://lore.kernel.org/llvm/20220516210954.1660716-1-ndesaulniers@google.com/

On Mon, May 16, 2022 at 2:10 PM Nick Desaulniers
<ndesaulniers@google.com> wrote:
>
> Similar to commit a6c30873ee4a ("ARM: 8989/1: use .fpu assembler
> directives instead of assembler arguments").
>
> GCC and GNU binutils support setting the "sub arch" via -march=,
> -Wa,-march, target function attribute, and .arch assembler directive.
>
> Clang was missing support for -Wa,-march=, but this was implemented in
> clang-13.
>
> The behavior of both GCC and Clang is to
> prefer -Wa,-march= over -march= for assembler and assembler-with-cpp
> sources, but Clang will warn about the -march= being unused.
>
> clang: warning: argument unused during compilation: '-march=armv6k'
> [-Wunused-command-line-argument]
>
> Since most assembler is non-conditionally assembled with one sub arch
> (modulo arch/arm/delay-loop.S which conditionally is assembled as armv4
> based on CONFIG_ARCH_RPC, and arch/arm/mach-at91/pm-suspend.S which is
> conditionally assembled as armv7-a based on CONFIG_CPU_V7), prefer the
> .arch assembler directive.
>
> Link: https://github.com/llvm/llvm-project/commit/1d51c699b9e2ebc5bcfdbe85c74cc871426333d4
> Link: https://bugs.llvm.org/show_bug.cgi?id=48894
> Link: https://github.com/ClangBuiltLinux/linux/issues/1195
> Link: https://github.com/ClangBuiltLinux/linux/issues/1315
> Suggested-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
> [arnd] add a few more instances found in compile testing
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> 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/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 +
> 40 files changed, 52 insertions(+), 40 deletions(-)
>
> diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
> index 41bcbb460fac..e5c80ff42a4f 100644
> --- a/arch/arm/boot/compressed/Makefile
> +++ b/arch/arm/boot/compressed/Makefile
> @@ -163,4 +163,3 @@ $(obj)/piggy_data: $(obj)/../Image FORCE
> $(obj)/piggy.o: $(obj)/piggy_data
>
> CFLAGS_font.o := -Dstatic=
> -AFLAGS_hyp-stub.o := -Wa,-march=armv7-a
> diff --git a/arch/arm/common/Makefile b/arch/arm/common/Makefile
> index 8cd574be94cf..6a42600fa4c5 100644
> --- a/arch/arm/common/Makefile
> +++ b/arch/arm/common/Makefile
> @@ -14,7 +14,5 @@ obj-$(CONFIG_SHARP_SCOOP) += scoop.o
> obj-$(CONFIG_CPU_V7) += secure_cntvoff.o
> obj-$(CONFIG_MCPM) += mcpm_head.o mcpm_entry.o mcpm_platsmp.o vlock.o
> CFLAGS_REMOVE_mcpm_entry.o = -pg
> -AFLAGS_mcpm_head.o := -march=armv7-a
> -AFLAGS_vlock.o := -march=armv7-a
> obj-$(CONFIG_BL_SWITCHER) += bL_switcher.o
> obj-$(CONFIG_BL_SWITCHER_DUMMY_IF) += bL_switcher_dummy_if.o
> diff --git a/arch/arm/common/mcpm_head.S b/arch/arm/common/mcpm_head.S
> index 291d969bc719..299495c43dfd 100644
> --- a/arch/arm/common/mcpm_head.S
> +++ b/arch/arm/common/mcpm_head.S
> @@ -15,6 +15,8 @@
>
> #include "vlock.h"
>
> +.arch armv7-a
> +
> .if MCPM_SYNC_CLUSTER_CPUS
> .error "cpus must be the first member of struct mcpm_sync_struct"
> .endif
> diff --git a/arch/arm/common/vlock.S b/arch/arm/common/vlock.S
> index f1c7fd44f1b1..1fa09c4697ed 100644
> --- a/arch/arm/common/vlock.S
> +++ b/arch/arm/common/vlock.S
> @@ -12,6 +12,8 @@
> #include <linux/linkage.h>
> #include "vlock.h"
>
> +.arch armv7-a
> +
> /* Select different code if voting flags can fit in a single word. */
> #if VLOCK_VOTING_SIZE > 4
> #define FEW(x...)
> diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
> index 553866751e1a..e64ed3a82f70 100644
> --- a/arch/arm/kernel/Makefile
> +++ b/arch/arm/kernel/Makefile
> @@ -71,7 +71,6 @@ obj-$(CONFIG_HAVE_TCM) += tcm.o
> obj-$(CONFIG_OF) += devtree.o
> obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
> obj-$(CONFIG_SWP_EMULATE) += swp_emulate.o
> -CFLAGS_swp_emulate.o := -Wa,-march=armv7-a
> obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
>
> obj-$(CONFIG_CPU_XSCALE) += xscale-cp0.o
> @@ -100,7 +99,6 @@ CFLAGS_head-inflate-data.o := $(call cc-option,-Wframe-larger-than=10240)
> obj-$(CONFIG_XIP_DEFLATED_DATA) += head-inflate-data.o
>
> obj-$(CONFIG_ARM_VIRT_EXT) += hyp-stub.o
> -AFLAGS_hyp-stub.o :=-Wa,-march=armv7-a
> ifeq ($(CONFIG_ARM_PSCI),y)
> obj-$(CONFIG_SMP) += psci_smp.o
> endif
> diff --git a/arch/arm/kernel/hyp-stub.S b/arch/arm/kernel/hyp-stub.S
> index b699b22a4db1..3a506b9095a5 100644
> --- a/arch/arm/kernel/hyp-stub.S
> +++ b/arch/arm/kernel/hyp-stub.S
> @@ -9,6 +9,8 @@
> #include <asm/assembler.h>
> #include <asm/virt.h>
>
> +.arch armv7-a
> +
> #ifndef ZIMAGE
> /*
> * For the kernel proper, we need to find out the CPU boot mode long after
> diff --git a/arch/arm/kernel/swp_emulate.c b/arch/arm/kernel/swp_emulate.c
> index b74bfcf94fb1..fdce83c95acb 100644
> --- a/arch/arm/kernel/swp_emulate.c
> +++ b/arch/arm/kernel/swp_emulate.c
> @@ -34,6 +34,7 @@
> */
> #define __user_swpX_asm(data, addr, res, temp, B) \
> __asm__ __volatile__( \
> + ".arch armv7-a\n" \
> "0: ldrex"B" %2, [%3]\n" \
> "1: strex"B" %0, %1, [%3]\n" \
> " cmp %0, #0\n" \
> diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
> index 6d2ba454f25b..42fb75c06647 100644
> --- a/arch/arm/lib/Makefile
> +++ b/arch/arm/lib/Makefile
> @@ -36,10 +36,6 @@ else
> lib-y += io-readsw-armv4.o io-writesw-armv4.o
> endif
>
> -ifeq ($(CONFIG_ARCH_RPC),y)
> - AFLAGS_delay-loop.o += -march=armv4
> -endif
> -
> $(obj)/csumpartialcopy.o: $(obj)/csumpartialcopygeneric.S
> $(obj)/csumpartialcopyuser.o: $(obj)/csumpartialcopygeneric.S
>
> diff --git a/arch/arm/lib/delay-loop.S b/arch/arm/lib/delay-loop.S
> index 3ccade0f8130..3ac05177d097 100644
> --- a/arch/arm/lib/delay-loop.S
> +++ b/arch/arm/lib/delay-loop.S
> @@ -8,6 +8,10 @@
> #include <asm/assembler.h>
> #include <asm/delay.h>
>
> +#ifdef CONFIG_ARCH_RPC
> + .arch armv4
> +#endif
> +
> .text
>
> .LC0: .word loops_per_jiffy
> diff --git a/arch/arm/mach-at91/Makefile b/arch/arm/mach-at91/Makefile
> index 522b680b6446..e7a47fa03626 100644
> --- a/arch/arm/mach-at91/Makefile
> +++ b/arch/arm/mach-at91/Makefile
> @@ -14,9 +14,6 @@ obj-$(CONFIG_SOC_SAMV7) += samv7.o
> # Power Management
> obj-$(CONFIG_ATMEL_PM) += pm.o pm_suspend.o
>
> -ifeq ($(CONFIG_CPU_V7),y)
> -AFLAGS_pm_suspend.o := -march=armv7-a
> -endif
> ifeq ($(CONFIG_PM_DEBUG),y)
> CFLAGS_pm.o += -DDEBUG
> endif
> diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S
> index abe4ced33eda..f0aa220d668d 100644
> --- a/arch/arm/mach-at91/pm_suspend.S
> +++ b/arch/arm/mach-at91/pm_suspend.S
> @@ -12,6 +12,10 @@
> #include "pm.h"
> #include "pm_data-offsets.h"
>
> +#ifdef CONFIG_CPU_V7
> +.arch armv7-a
> +#endif
> +
> #define SRAMC_SELF_FRESH_ACTIVE 0x01
> #define SRAMC_SELF_FRESH_EXIT 0x00
>
> diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
> index 6fb3965b9ae6..5c650bf40e02 100644
> --- a/arch/arm/mach-imx/Makefile
> +++ b/arch/arm/mach-imx/Makefile
> @@ -34,7 +34,6 @@ obj-$(CONFIG_HAVE_IMX_GPC) += gpc.o
> obj-$(CONFIG_HAVE_IMX_MMDC) += mmdc.o
> obj-$(CONFIG_HAVE_IMX_SRC) += src.o
> ifneq ($(CONFIG_SOC_IMX6)$(CONFIG_SOC_IMX7D_CA7)$(CONFIG_SOC_LS1021A),)
> -AFLAGS_headsmp.o :=-Wa,-march=armv7-a
> obj-$(CONFIG_SMP) += headsmp.o platsmp.o
> obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
> endif
> @@ -48,12 +47,10 @@ obj-$(CONFIG_SOC_IMX7D_CM4) += mach-imx7d-cm4.o
> obj-$(CONFIG_SOC_IMX7ULP) += mach-imx7ulp.o pm-imx7ulp.o
>
> ifeq ($(CONFIG_SUSPEND),y)
> -AFLAGS_suspend-imx6.o :=-Wa,-march=armv7-a
> obj-$(CONFIG_SOC_IMX6) += suspend-imx6.o
> obj-$(CONFIG_SOC_IMX53) += suspend-imx53.o
> endif
> ifeq ($(CONFIG_ARM_CPU_SUSPEND),y)
> -AFLAGS_resume-imx6.o :=-Wa,-march=armv7-a
> obj-$(CONFIG_SOC_IMX6) += resume-imx6.o
> endif
> obj-$(CONFIG_SOC_IMX6) += pm-imx6.o
> diff --git a/arch/arm/mach-imx/headsmp.S b/arch/arm/mach-imx/headsmp.S
> index fcba58be8e79..5f9c7b48ae80 100644
> --- a/arch/arm/mach-imx/headsmp.S
> +++ b/arch/arm/mach-imx/headsmp.S
> @@ -8,6 +8,8 @@
> #include <linux/init.h>
> #include <asm/assembler.h>
>
> +.arch armv7-a
> +
> diag_reg_offset:
> .word g_diag_reg - .
>
> diff --git a/arch/arm/mach-imx/resume-imx6.S b/arch/arm/mach-imx/resume-imx6.S
> index 5bd1ba7ef15b..2c0c5c771251 100644
> --- a/arch/arm/mach-imx/resume-imx6.S
> +++ b/arch/arm/mach-imx/resume-imx6.S
> @@ -9,6 +9,8 @@
> #include <asm/hardware/cache-l2x0.h>
> #include "hardware.h"
>
> +.arch armv7-a
> +
> /*
> * The following code must assume it is running from physical address
> * where absolute virtual addresses to the data section have to be
> diff --git a/arch/arm/mach-imx/suspend-imx6.S b/arch/arm/mach-imx/suspend-imx6.S
> index e06f946b75b9..63ccc2d0e920 100644
> --- a/arch/arm/mach-imx/suspend-imx6.S
> +++ b/arch/arm/mach-imx/suspend-imx6.S
> @@ -9,6 +9,8 @@
> #include <asm/hardware/cache-l2x0.h>
> #include "hardware.h"
>
> +.arch armv7-a
> +
> /*
> * ==================== low level suspend ====================
> *
> diff --git a/arch/arm/mach-mvebu/Makefile b/arch/arm/mach-mvebu/Makefile
> index cb106899dd7c..9b9fddb69958 100644
> --- a/arch/arm/mach-mvebu/Makefile
> +++ b/arch/arm/mach-mvebu/Makefile
> @@ -1,9 +1,6 @@
> # SPDX-License-Identifier: GPL-2.0
> ccflags-$(CONFIG_ARCH_MULTIPLATFORM) := -I$(srctree)/arch/arm/plat-orion/include
>
> -AFLAGS_coherency_ll.o := -Wa,-march=armv7-a
> -CFLAGS_pmsu.o := -march=armv7-a
> -
> obj-$(CONFIG_MACH_MVEBU_ANY) += system-controller.o mvebu-soc-id.o
>
> ifeq ($(CONFIG_MACH_MVEBU_V7),y)
> diff --git a/arch/arm/mach-mvebu/coherency_ll.S b/arch/arm/mach-mvebu/coherency_ll.S
> index a3a64bf97250..25197290632d 100644
> --- a/arch/arm/mach-mvebu/coherency_ll.S
> +++ b/arch/arm/mach-mvebu/coherency_ll.S
> @@ -23,6 +23,7 @@
> #include <asm/assembler.h>
> #include <asm/cp15.h>
>
> + .arch armv7-a
> .text
> /*
> * Returns the coherency base address in r1 (r0 is untouched), or 0 if
> diff --git a/arch/arm/mach-mvebu/pmsu.c b/arch/arm/mach-mvebu/pmsu.c
> index 73d5d72dfc3e..9a77cc3a10bd 100644
> --- a/arch/arm/mach-mvebu/pmsu.c
> +++ b/arch/arm/mach-mvebu/pmsu.c
> @@ -294,6 +294,7 @@ int armada_370_xp_pmsu_idle_enter(unsigned long deepidle)
>
> /* Test the CR_C bit and set it if it was cleared */
> asm volatile(
> + ".arch armv7-a\n\t"
> "mrc p15, 0, r0, c1, c0, 0 \n\t"
> "tst r0, %0 \n\t"
> "orreq r0, r0, #(1 << 2) \n\t"
> diff --git a/arch/arm/mach-npcm/Makefile b/arch/arm/mach-npcm/Makefile
> index 8d61fcd42fb1..ac83e1caf2ee 100644
> --- a/arch/arm/mach-npcm/Makefile
> +++ b/arch/arm/mach-npcm/Makefile
> @@ -1,6 +1,4 @@
> # SPDX-License-Identifier: GPL-2.0-only
> -AFLAGS_headsmp.o += -march=armv7-a
> -
> obj-$(CONFIG_ARCH_WPCM450) += wpcm450.o
> obj-$(CONFIG_ARCH_NPCM7XX) += npcm7xx.o
> obj-$(CONFIG_SMP) += platsmp.o headsmp.o
> diff --git a/arch/arm/mach-npcm/headsmp.S b/arch/arm/mach-npcm/headsmp.S
> index c083fe09a07b..84d2b6daaf0b 100644
> --- a/arch/arm/mach-npcm/headsmp.S
> +++ b/arch/arm/mach-npcm/headsmp.S
> @@ -6,6 +6,8 @@
> #include <linux/init.h>
> #include <asm/assembler.h>
>
> +.arch armv7-a
> +
> /*
> * The boot ROM does not start secondary CPUs in SVC mode, so we need to do that
> * here.
> diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
> index 07572b5373b8..a2bb55bc0081 100644
> --- a/arch/arm/mach-tegra/Makefile
> +++ b/arch/arm/mach-tegra/Makefile
> @@ -1,6 +1,4 @@
> # SPDX-License-Identifier: GPL-2.0
> -asflags-y += -march=armv7-a
> -
> obj-y += io.o
> obj-y += irq.o
> obj-y += pm.o
> diff --git a/arch/arm/mach-tegra/reset-handler.S b/arch/arm/mach-tegra/reset-handler.S
> index 06ca44b09381..0ea456264f3e 100644
> --- a/arch/arm/mach-tegra/reset-handler.S
> +++ b/arch/arm/mach-tegra/reset-handler.S
> @@ -19,6 +19,8 @@
>
> #define PMC_SCRATCH41 0x140
>
> +.arch armv7-a
> +
> #ifdef CONFIG_PM_SLEEP
> /*
> * tegra_resume
> diff --git a/arch/arm/mach-tegra/sleep-tegra20.S b/arch/arm/mach-tegra/sleep-tegra20.S
> index a5a36cce142a..d8cd487a8f63 100644
> --- a/arch/arm/mach-tegra/sleep-tegra20.S
> +++ b/arch/arm/mach-tegra/sleep-tegra20.S
> @@ -47,6 +47,8 @@
> #define PLLM_STORE_MASK (1 << 1)
> #define PLLP_STORE_MASK (1 << 2)
>
> +.arch armv7-a
> +
> .macro test_pll_state, rd, test_mask
> ldr \rd, tegra_pll_state
> tst \rd, #\test_mask
> diff --git a/arch/arm/mach-tegra/sleep-tegra30.S b/arch/arm/mach-tegra/sleep-tegra30.S
> index 0cc40b6b2ba3..134ea5fe49b2 100644
> --- a/arch/arm/mach-tegra/sleep-tegra30.S
> +++ b/arch/arm/mach-tegra/sleep-tegra30.S
> @@ -78,6 +78,8 @@
> #define PLLX_STORE_MASK (1 << 4)
> #define PLLM_PMC_STORE_MASK (1 << 5)
>
> +.arch armv7-a
> +
> .macro emc_device_mask, rd, base
> ldr \rd, [\base, #EMC_ADR_CFG]
> tst \rd, #0x1
> diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile
> index 3510503bc5e6..71b858c9b10c 100644
> --- a/arch/arm/mm/Makefile
> +++ b/arch/arm/mm/Makefile
> @@ -33,9 +33,6 @@ obj-$(CONFIG_CPU_ABRT_EV5TJ) += abort-ev5tj.o
> obj-$(CONFIG_CPU_ABRT_EV6) += abort-ev6.o
> obj-$(CONFIG_CPU_ABRT_EV7) += abort-ev7.o
>
> -AFLAGS_abort-ev6.o :=-Wa,-march=armv6k
> -AFLAGS_abort-ev7.o :=-Wa,-march=armv7-a
> -
> obj-$(CONFIG_CPU_PABRT_LEGACY) += pabort-legacy.o
> obj-$(CONFIG_CPU_PABRT_V6) += pabort-v6.o
> obj-$(CONFIG_CPU_PABRT_V7) += pabort-v7.o
> @@ -49,10 +46,6 @@ obj-$(CONFIG_CPU_CACHE_FA) += cache-fa.o
> obj-$(CONFIG_CPU_CACHE_NOP) += cache-nop.o
> obj-$(CONFIG_CPU_CACHE_V7M) += cache-v7m.o
>
> -AFLAGS_cache-v6.o :=-Wa,-march=armv6
> -AFLAGS_cache-v7.o :=-Wa,-march=armv7-a
> -AFLAGS_cache-v7m.o :=-Wa,-march=armv7-m
> -
> obj-$(CONFIG_CPU_COPY_V4WT) += copypage-v4wt.o
> obj-$(CONFIG_CPU_COPY_V4WB) += copypage-v4wb.o
> obj-$(CONFIG_CPU_COPY_FEROCEON) += copypage-feroceon.o
> @@ -62,8 +55,6 @@ obj-$(CONFIG_CPU_XSCALE) += copypage-xscale.o
> obj-$(CONFIG_CPU_XSC3) += copypage-xsc3.o
> obj-$(CONFIG_CPU_COPY_FA) += copypage-fa.o
>
> -CFLAGS_copypage-feroceon.o := -march=armv5te
> -
> obj-$(CONFIG_CPU_TLB_V4WT) += tlb-v4.o
> obj-$(CONFIG_CPU_TLB_V4WB) += tlb-v4wb.o
> obj-$(CONFIG_CPU_TLB_V4WBI) += tlb-v4wbi.o
> @@ -72,9 +63,6 @@ obj-$(CONFIG_CPU_TLB_V6) += tlb-v6.o
> obj-$(CONFIG_CPU_TLB_V7) += tlb-v7.o
> obj-$(CONFIG_CPU_TLB_FA) += tlb-fa.o
>
> -AFLAGS_tlb-v6.o :=-Wa,-march=armv6
> -AFLAGS_tlb-v7.o :=-Wa,-march=armv7-a
> -
> obj-$(CONFIG_CPU_ARM7TDMI) += proc-arm7tdmi.o
> obj-$(CONFIG_CPU_ARM720T) += proc-arm720.o
> obj-$(CONFIG_CPU_ARM740T) += proc-arm740.o
> @@ -101,9 +89,6 @@ obj-$(CONFIG_CPU_V6K) += proc-v6.o
> obj-$(CONFIG_CPU_V7) += proc-v7.o proc-v7-bugs.o
> obj-$(CONFIG_CPU_V7M) += proc-v7m.o
>
> -AFLAGS_proc-v6.o :=-Wa,-march=armv6
> -AFLAGS_proc-v7.o :=-Wa,-march=armv7-a
> -
> obj-$(CONFIG_OUTER_CACHE) += l2c-common.o
> obj-$(CONFIG_CACHE_B15_RAC) += cache-b15-rac.o
> obj-$(CONFIG_CACHE_FEROCEON_L2) += cache-feroceon-l2.o
> diff --git a/arch/arm/mm/abort-ev6.S b/arch/arm/mm/abort-ev6.S
> index c58bf8b43fea..836dc1299243 100644
> --- a/arch/arm/mm/abort-ev6.S
> +++ b/arch/arm/mm/abort-ev6.S
> @@ -16,6 +16,7 @@
> * abort here if the I-TLB and D-TLB aren't seeing the same
> * picture. Unfortunately, this does happen. We live with it.
> */
> + .arch armv6k
> .align 5
> ENTRY(v6_early_abort)
> mrc p15, 0, r1, c5, c0, 0 @ get FSR
> diff --git a/arch/arm/mm/abort-ev7.S b/arch/arm/mm/abort-ev7.S
> index f81bceacc660..53fb41c24774 100644
> --- a/arch/arm/mm/abort-ev7.S
> +++ b/arch/arm/mm/abort-ev7.S
> @@ -12,6 +12,7 @@
> *
> * Purpose : obtain information about current aborted instruction.
> */
> + .arch armv7-a
> .align 5
> ENTRY(v7_early_abort)
> mrc p15, 0, r1, c5, c0, 0 @ get FSR
> diff --git a/arch/arm/mm/cache-v6.S b/arch/arm/mm/cache-v6.S
> index f0f65eb073e4..250c83bf7158 100644
> --- a/arch/arm/mm/cache-v6.S
> +++ b/arch/arm/mm/cache-v6.S
> @@ -19,6 +19,8 @@
> #define D_CACHE_LINE_SIZE 32
> #define BTB_FLUSH_SIZE 8
>
> +.arch armv6
> +
> /*
> * v6_flush_icache_all()
> *
> diff --git a/arch/arm/mm/cache-v7.S b/arch/arm/mm/cache-v7.S
> index 7c9499b728c4..127afe2096ba 100644
> --- a/arch/arm/mm/cache-v7.S
> +++ b/arch/arm/mm/cache-v7.S
> @@ -16,6 +16,8 @@
>
> #include "proc-macros.S"
>
> +.arch armv7-a
> +
> #ifdef CONFIG_CPU_ICACHE_MISMATCH_WORKAROUND
> .globl icache_size
> .data
> diff --git a/arch/arm/mm/cache-v7m.S b/arch/arm/mm/cache-v7m.S
> index 1bc3a0a50753..eb60b5e5e2ad 100644
> --- a/arch/arm/mm/cache-v7m.S
> +++ b/arch/arm/mm/cache-v7m.S
> @@ -18,6 +18,8 @@
>
> #include "proc-macros.S"
>
> +.arch armv7-m
> +
> /* Generic V7M read/write macros for memory mapped cache operations */
> .macro v7m_cache_read, rt, reg
> movw \rt, #:lower16:BASEADDR_V7M_SCB + \reg
> diff --git a/arch/arm/mm/copypage-feroceon.c b/arch/arm/mm/copypage-feroceon.c
> index 064b19e63571..5fc8ef1e665f 100644
> --- a/arch/arm/mm/copypage-feroceon.c
> +++ b/arch/arm/mm/copypage-feroceon.c
> @@ -15,6 +15,7 @@ static void feroceon_copy_user_page(void *kto, const void *kfrom)
> int tmp;
>
> asm volatile ("\
> +.arch armv5te \n\
> 1: ldmia %1!, {r2 - r7, ip, lr} \n\
> pld [%1, #0] \n\
> pld [%1, #32] \n\
> diff --git a/arch/arm/mm/proc-v6.S b/arch/arm/mm/proc-v6.S
> index a0618f3e6836..203dff89ab1a 100644
> --- a/arch/arm/mm/proc-v6.S
> +++ b/arch/arm/mm/proc-v6.S
> @@ -32,6 +32,8 @@
> #define TTB_FLAGS_SMP TTB_RGN_WBWA|TTB_S
> #define PMD_FLAGS_SMP PMD_SECT_WBWA|PMD_SECT_S
>
> +.arch armv6
> +
> ENTRY(cpu_v6_proc_init)
> ret lr
>
> diff --git a/arch/arm/mm/proc-v7-2level.S b/arch/arm/mm/proc-v7-2level.S
> index 5db029c8f987..0a3083ad19c2 100644
> --- a/arch/arm/mm/proc-v7-2level.S
> +++ b/arch/arm/mm/proc-v7-2level.S
> @@ -24,6 +24,8 @@
> #define TTB_FLAGS_SMP TTB_IRGN_WBWA|TTB_S|TTB_NOS|TTB_RGN_OC_WBWA
> #define PMD_FLAGS_SMP PMD_SECT_WBWA|PMD_SECT_S
>
> +.arch armv7-a
> +
> /*
> * cpu_v7_switch_mm(pgd_phys, tsk)
> *
> diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
> index 26d726a08a34..6b4ef9539b68 100644
> --- a/arch/arm/mm/proc-v7.S
> +++ b/arch/arm/mm/proc-v7.S
> @@ -24,6 +24,8 @@
> #include "proc-v7-2level.S"
> #endif
>
> +.arch armv7-a
> +
> ENTRY(cpu_v7_proc_init)
> ret lr
> ENDPROC(cpu_v7_proc_init)
> diff --git a/arch/arm/mm/tlb-v6.S b/arch/arm/mm/tlb-v6.S
> index 74f4b383afe3..1d91e49b2c2d 100644
> --- a/arch/arm/mm/tlb-v6.S
> +++ b/arch/arm/mm/tlb-v6.S
> @@ -17,6 +17,8 @@
>
> #define HARVARD_TLB
>
> +.arch armv6
> +
> /*
> * v6wbi_flush_user_tlb_range(start, end, vma)
> *
> diff --git a/arch/arm/mm/tlb-v7.S b/arch/arm/mm/tlb-v7.S
> index 87bf4ab17721..35fd6d4f0d03 100644
> --- a/arch/arm/mm/tlb-v7.S
> +++ b/arch/arm/mm/tlb-v7.S
> @@ -16,6 +16,8 @@
> #include <asm/tlbflush.h>
> #include "proc-macros.S"
>
> +.arch armv7-a
> +
> /*
> * v7wbi_flush_user_tlb_range(start, end, vma)
> *
> diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile
> index bc7663ed1c25..d1388a748872 100644
> --- a/drivers/memory/Makefile
> +++ b/drivers/memory/Makefile
> @@ -32,8 +32,6 @@ obj-$(CONFIG_FPGA_DFL_EMIF) += dfl-emif.o
>
> ti-emif-sram-objs := ti-emif-pm.o ti-emif-sram-pm.o
>
> -AFLAGS_ti-emif-sram-pm.o :=-Wa,-march=armv7-a
> -
> $(obj)/ti-emif-sram-pm.o: $(obj)/ti-emif-asm-offsets.h
>
> $(obj)/ti-emif-asm-offsets.h: $(obj)/emif-asm-offsets.s FORCE
> diff --git a/drivers/memory/ti-emif-sram-pm.S b/drivers/memory/ti-emif-sram-pm.S
> index d1c83bd5b98e..af2feb251303 100644
> --- a/drivers/memory/ti-emif-sram-pm.S
> +++ b/drivers/memory/ti-emif-sram-pm.S
> @@ -36,6 +36,7 @@
>
> .arm
> .align 3
> + .arch armv7-a
>
> ENTRY(ti_emif_sram)
>
> diff --git a/drivers/soc/bcm/brcmstb/pm/Makefile b/drivers/soc/bcm/brcmstb/pm/Makefile
> index 8e10abb14f8b..f849cfa69446 100644
> --- a/drivers/soc/bcm/brcmstb/pm/Makefile
> +++ b/drivers/soc/bcm/brcmstb/pm/Makefile
> @@ -1,4 +1,3 @@
> # SPDX-License-Identifier: GPL-2.0-only
> obj-$(CONFIG_ARM) += s2-arm.o pm-arm.o
> -AFLAGS_s2-arm.o := -march=armv7-a
> obj-$(CONFIG_BMIPS_GENERIC) += s2-mips.o s3-mips.o pm-mips.o
> diff --git a/drivers/soc/bcm/brcmstb/pm/s2-arm.S b/drivers/soc/bcm/brcmstb/pm/s2-arm.S
> index 5f0c4a8ae9df..0d693795de27 100644
> --- a/drivers/soc/bcm/brcmstb/pm/s2-arm.S
> +++ b/drivers/soc/bcm/brcmstb/pm/s2-arm.S
> @@ -8,6 +8,7 @@
>
> #include "pm.h"
>
> + .arch armv7-a
> .text
> .align 3
>
> --
> 2.36.0.550.gb090851708-goog
>

--
Thanks,
~Nick Desaulniers