linux-kernel - Re: [PATCH 01/20] ata: ahci_dm816: Ignore -Woverride-init

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Date:   Mon, 1 Feb 2021 12:05:59 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jens Axboe <axboe@...nel.dk>,
        IDE-ML <linux-ide@...r.kernel.org>
Subject: Re: [PATCH 01/20] ata: ahci_dm816: Ignore -Woverride-init

On Thu, Jan 28, 2021 at 7:32 PM Lee Jones <lee.jones@...aro.org> wrote:
>
> On Thu, 28 Jan 2021, Christoph Hellwig wrote:
>
> > On Thu, Jan 28, 2021 at 06:02:20PM +0000, Lee Jones wrote:
> > > Some ATA drivers use the SCSI host template, a series of interwoven
> > > macros, to aid with initialisation.  Some of these macros conflict,
> > > resulting in the over-writing of previously set values.
> >
> > Please just disable this warning globally.  This is a sensible
> > patter and we should not sprinkle per-file options for something
> > that fundamental.
>
> Will do.  Just as soon as I've figured out how. :)

I have a local patch series doing it like this

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 5f550eb27f81..4e4cc14a289e 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1390,6 +1390,8 @@ extern struct device_attribute *ata_common_sdev_attrs[];
  * edge driver's module reference, otherwise the driver can be unloaded
  * even if the scsi_device is being accessed.
  */
+__diag_ignore(GCC, 8, "-Woverride-init", "intentional override")
+__diag_ignore(CLANG, 9, "-Winitializer-overrides", "intentional override")
 #define __ATA_BASE_SHT(drv_name)                               \
        .module                 = THIS_MODULE,                  \
        .name                   = drv_name,                     \

I think this also requires a preparation patch to extend __diag_ignore to
additional compiler versions, not sure if that was already merged.

         Arnd