linux-kernel - Re: [PATCH] habanalabs: remove variable 'val' set but not used

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Message-ID: <CAFCwf13U7qcJEL=3qqtNSid7KBiviaJR-64+X5zsu-118-GODQ@mail.gmail.com>
Date:   Fri, 13 Dec 2019 04:09:03 +0200
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     Chen Wandun <chenwandun@...wei.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Tomer Tayar <ttayar@...ana.ai>,
        Omer Shpigelman <oshpigelman@...ana.ai>,
        Dalit Ben Zoor <dbenzoor@...ana.ai>,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] habanalabs: remove variable 'val' set but not used

On Tue, Dec 10, 2019 at 1:00 PM Chen Wandun <chenwandun@...wei.com> wrote:
>
> Fixes gcc '-Wunused-but-set-variable' warning:
>
> drivers/misc/habanalabs/goya/goya.c: In function goya_pldm_init_cpu:
> drivers/misc/habanalabs/goya/goya.c:2195:6: warning: variable val set but not used [-Wunused-but-set-variable]
> drivers/misc/habanalabs/goya/goya.c: In function goya_hw_init:
> drivers/misc/habanalabs/goya/goya.c:2505:6: warning: variable val set but not used [-Wunused-but-set-variable]
>
> Fixes: 9494a8dd8d22 ("habanalabs: add h/w queues module")
> Signed-off-by: Chen Wandun <chenwandun@...wei.com>
> ---
>  drivers/misc/habanalabs/goya/goya.c | 15 +++++++--------
>  1 file changed, 7 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
> index c8d16aa..7344e8a 100644
> --- a/drivers/misc/habanalabs/goya/goya.c
> +++ b/drivers/misc/habanalabs/goya/goya.c
> @@ -2192,7 +2192,7 @@ static int goya_push_linux_to_device(struct hl_device *hdev)
>
>  static int goya_pldm_init_cpu(struct hl_device *hdev)
>  {
> -       u32 val, unit_rst_val;
> +       u32 unit_rst_val;
>         int rc;
>
>         /* Must initialize SRAM scrambler before pushing u-boot to SRAM */
> @@ -2200,14 +2200,14 @@ static int goya_pldm_init_cpu(struct hl_device *hdev)
>
>         /* Put ARM cores into reset */
>         WREG32(mmCPU_CA53_CFG_ARM_RST_CONTROL, CPU_RESET_ASSERT);
> -       val = RREG32(mmCPU_CA53_CFG_ARM_RST_CONTROL);
> +       RREG32(mmCPU_CA53_CFG_ARM_RST_CONTROL);
>
>         /* Reset the CA53 MACRO */
>         unit_rst_val = RREG32(mmPSOC_GLOBAL_CONF_UNIT_RST_N);
>         WREG32(mmPSOC_GLOBAL_CONF_UNIT_RST_N, CA53_RESET);
> -       val = RREG32(mmPSOC_GLOBAL_CONF_UNIT_RST_N);
> +       RREG32(mmPSOC_GLOBAL_CONF_UNIT_RST_N);
>         WREG32(mmPSOC_GLOBAL_CONF_UNIT_RST_N, unit_rst_val);
> -       val = RREG32(mmPSOC_GLOBAL_CONF_UNIT_RST_N);
> +       RREG32(mmPSOC_GLOBAL_CONF_UNIT_RST_N);
>
>         rc = goya_push_uboot_to_device(hdev);
>         if (rc)
> @@ -2228,7 +2228,7 @@ static int goya_pldm_init_cpu(struct hl_device *hdev)
>         /* Release ARM core 0 from reset */
>         WREG32(mmCPU_CA53_CFG_ARM_RST_CONTROL,
>                                         CPU_RESET_CORE0_DEASSERT);
> -       val = RREG32(mmCPU_CA53_CFG_ARM_RST_CONTROL);
> +       RREG32(mmCPU_CA53_CFG_ARM_RST_CONTROL);
>
>         return 0;
>  }
> @@ -2502,13 +2502,12 @@ int goya_mmu_init(struct hl_device *hdev)
>  static int goya_hw_init(struct hl_device *hdev)
>  {
>         struct asic_fixed_properties *prop = &hdev->asic_prop;
> -       u32 val;
>         int rc;
>
>         dev_info(hdev->dev, "Starting initialization of H/W\n");
>
>         /* Perform read from the device to make sure device is up */
> -       val = RREG32(mmPCIE_DBI_DEVICE_ID_VENDOR_ID_REG);
> +       RREG32(mmPCIE_DBI_DEVICE_ID_VENDOR_ID_REG);
>
>         /*
>          * Let's mark in the H/W that we have reached this point. We check
> @@ -2560,7 +2559,7 @@ static int goya_hw_init(struct hl_device *hdev)
>                 goto disable_queues;
>
>         /* Perform read from the device to flush all MSI-X configuration */
> -       val = RREG32(mmPCIE_DBI_DEVICE_ID_VENDOR_ID_REG);
> +       RREG32(mmPCIE_DBI_DEVICE_ID_VENDOR_ID_REG);
>
>         return 0;
>
> --
> 2.7.4
>

Thanks!
Applied to -fixes
Oded