linux-kernel - [PATCH 4.19 0/6] fix warning and errors on arm built with clang

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Message-Id: <20211217144119.2538175-1-anders.roxell@linaro.org>
Date:   Fri, 17 Dec 2021 15:41:13 +0100
From:   Anders Roxell <anders.roxell@...aro.org>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, woojung.huh@...rochip.com,
        UNGLinuxDriver@...rochip.com, davem@...emloft.net,
        netdev@...r.kernel.org, linux-usb@...r.kernel.org,
        clang-built-linux@...glegroups.com, ulli.kroll@...glemail.com,
        linux@...linux.org.uk, linux-arm-kernel@...ts.infradead.org,
        amitkarwar@...il.com, nishants@...vell.com, gbhat@...vell.com,
        huxinming820@...il.com, kvalo@...eaurora.org,
        linux-wireless@...r.kernel.org, rostedt@...dmis.org,
        mingo@...hat.com, dmitry.torokhov@...il.com,
        ndesaulniers@...gle.com, nathan@...nel.org,
        linux-input@...r.kernel.org,
        Anders Roxell <anders.roxell@...aro.org>
Subject: [PATCH 4.19 0/6] fix warning and errors on arm built with clang

Hi,

Can this patchset be applied to linux-4.19.y. I've tried to build an arm
kernel for these defconfigs:

mini2440_defconfig, mxs_defconfig, imx_v4_v5_defconfig,
integrator_defconfig, lpc32xx_defconfig, s3c2410_defconfig,
nhk8815_defconfig, imx_v6_v7_defconfig, at91_dt_defconfig,
shmobile_defconfig, omap1_defconfig, multi_v5_defconfig,
orion5x_defconfig, footbridge_defconfig, davinci_all_defconfig

Without this patchset these configs faild to build.
Also I fixed a few warnings.

There are still a few more warnings to fix.
But this is a start.

I built the kernel with tuxmake and this is the command:
tuxmake --runtime podman --target-arch arm --toolchain clang-nightly --kconfig tinyconfig LLVM=1 LLVM_IAS=0

Similar results with clang-13.


Patch "net: lan78xx: Avoid unnecessary self assignment" fixes:

drivers/net/usb/lan78xx.c:949:11: warning: explicitly assigning value of variable of type 'u32' (aka 'unsigned int') to itself [-Wself-assign]
                        offset = offset;
                        ~~~~~~ ^ ~~~~~~
1 warning generated.


Patch "ARM: 8805/2: remove unneeded naked function usage" fixes:

arch/arm/mm/copypage-v4wb.c:47:9: error: parameter references not allowed in naked functions
        : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE / 64));
               ^
/builds/linux/arch/arm/mm/copypage-v4wb.c:25:13: note: attribute is here
static void __naked
            ^
/builds/linux/include/linux/compiler_types.h:249:34: note: expanded from macro '__naked'
#define __naked                 __attribute__((naked)) notrace
                                               ^
1 error generated.


Patch "mwifiex: Remove unnecessary braces from HostCmd_SET_SEQ_NO_BSS_INFO" fixes:

drivers/net/wireless/marvell/mwifiex/cmdevt.c:219:22: warning: '(' and '{' tokens introducing statement expression appear in different macro expansion contexts [-Wcompound-token-split-by-macro]
        host_cmd->seq_num = cpu_to_le16(HostCmd_SET_SEQ_NO_BSS_INFO
                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/builds/linux/include/linux/byteorder/generic.h:90:21: note: expanded from macro 'cpu_to_le16'
#define cpu_to_le16 __cpu_to_le16
                    ^


Patch "Input: touchscreen - avoid bitwise vs logical OR warning" fixes:

drivers/input/touchscreen/of_touchscreen.c:80:17: warning: use of bitwise '|' with boolean operands [-Wbitwise-instead-of-logical]
        data_present = touchscreen_get_prop_u32(dev, "touchscreen-size-x",
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


Patch "ARM: 8788/1: ftrace: remove old mcount support" fixes:

arch/arm/kernel/entry-ftrace.S:56:2: error: Ftrace requires CONFIG_FRAME_POINTER=y with GCC older than 4.4.0.
#error Ftrace requires CONFIG_FRAME_POINTER=y with GCC older than 4.4.0.
 ^
1 error generated.


Patch "ARM: 8800/1: use choice for kernel unwinders" fixes the build
error:

clang: error: unknown argument: '-mapcs'
clang: error: unknown argument: '-mno-sched-prolog'


Cheers,
Anders

Nathan Chancellor (3):
  net: lan78xx: Avoid unnecessary self assignment
  mwifiex: Remove unnecessary braces from HostCmd_SET_SEQ_NO_BSS_INFO
  Input: touchscreen - avoid bitwise vs logical OR warning

Nicolas Pitre (1):
  ARM: 8805/2: remove unneeded naked function usage

Stefan Agner (2):
  ARM: 8800/1: use choice for kernel unwinders
  ARM: 8788/1: ftrace: remove old mcount support

 arch/arm/Kconfig.debug                        | 45 +++++----
 arch/arm/include/asm/ftrace.h                 |  3 -
 arch/arm/kernel/armksyms.c                    |  3 -
 arch/arm/kernel/entry-ftrace.S                | 75 +-------------
 arch/arm/kernel/ftrace.c                      | 51 ----------
 arch/arm/mm/copypage-fa.c                     | 35 ++++---
 arch/arm/mm/copypage-feroceon.c               | 98 +++++++++----------
 arch/arm/mm/copypage-v4mc.c                   | 19 ++--
 arch/arm/mm/copypage-v4wb.c                   | 41 ++++----
 arch/arm/mm/copypage-v4wt.c                   | 37 ++++---
 arch/arm/mm/copypage-xsc3.c                   | 71 ++++++--------
 arch/arm/mm/copypage-xscale.c                 | 71 +++++++-------
 drivers/input/touchscreen/of_touchscreen.c    | 18 ++--
 drivers/net/usb/lan78xx.c                     |  6 +-
 drivers/net/wireless/marvell/mwifiex/cmdevt.c |  4 +-
 drivers/net/wireless/marvell/mwifiex/fw.h     |  8 +-
 lib/Kconfig.debug                             |  6 +-
 17 files changed, 228 insertions(+), 363 deletions(-)

-- 
2.34.1