linux-kernel - arch/arm/probes/kprobes/core.c:409:30: error: .fnstart must precede .save or .vsave directives

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Date:   Mon, 26 Sep 2022 18:57:00 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     open list <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        regressions@...ts.linux.dev, lkft-triage@...ts.linaro.org
Subject: arch/arm/probes/kprobes/core.c:409:30: error: .fnstart must precede
 .save or .vsave directives

Following build warnings / errors noticed on arm with clang-13 / 14
on Linux next-20220923.

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

Regressions found on arm:

   - build-clang-13-bcm2835_defconfig
   - build-clang-nightly-imx_v6_v7_defconfig
   - build-clang-nightly-orion5x_defconfig
   - build-clang-13-keystone_defconfig
   - build-clang-13-omap2plus_defconfig
   - build-clang-14-imx_v6_v7_defconfig
   - build-clang-nightly-omap2plus_defconfig
   - build-clang-nightly-multi_v5_defconfig
   - build-clang-nightly-bcm2835_defconfig
   - build-clang-13-imx_v6_v7_defconfig
   - build-clang-13-imx_v4_v5_defconfig
   - build-clang-14-imx_v4_v5_defconfig
   - build-clang-13-orion5x_defconfig
   - build-clang-14-multi_v5_defconfig-65236a87
   - build-clang-14-lkftconfig
   - build-clang-nightly-imx_v4_v5_defconfig
   - build-clang-13-multi_v5_defconfig
   - build-clang-13-lkftconfig
   - build-clang-nightly-keystone_defconfig
   - build-clang-14-multi_v5_defconfig
   - build-clang-14-orion5x_defconfig
   - build-clang-14-omap2plus_defconfig
   - build-clang-nightly-multi_v5_defconfig-65236a87
   - build-clang-14-bcm2835_defconfig
   - build-clang-14-keystone_defconfig
   - build-clang-nightly-lkftconfig

arch/arm/probes/kprobes/core.c:409:30: error: .fnstart must precede
.save or .vsave directives
                "stmdb  sp, {sp, lr, pc}        \n\t"
                                                  ^
<inline asm>:3:2: note: instantiated into assembly here
        .save   {sp, lr, pc}
        ^
/builds/linux/arch/arm/probes/kprobes/core.c:412:29: error: .fnstart
must precede .pad directive
                "stmdb  sp!, {r0 - r11}         \n\t"
                                                  ^
<inline asm>:6:2: note: instantiated into assembly here
        .pad    #52
        ^
2 errors generated.
make[5]: *** [/builds/linux/scripts/Makefile.build:250:
arch/arm/probes/kprobes/core.o] Error 1

build log:
https://builds.tuxbuild.com/2FAyD1qcTlzjIYE7mjrugjCsxu1/

--
Linaro LKFT
https://lkft.linaro.org