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From:   David Laight <David.Laight@ACULAB.COM>
To:     'Kees Cook' <keescook@chromium.org>,
        Ard Biesheuvel <ardb@kernel.org>
CC:     Victor Erminpour <victor.erminpour@oracle.com>,
        Robin Murphy <robin.murphy@arm.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Hanjun Guo <guohanjun@huawei.com>,
        Sudeep Holla <sudeep.holla@arm.com>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Len Brown <lenb@kernel.org>,
        "ACPI Devel Maling List" <linux-acpi@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "trivial@kernel.org" <trivial@kernel.org>
Subject: RE: [PATCH v2] ACPI/IORT: Fix GCC 12 warning
Thread-Topic: [PATCH v2] ACPI/IORT: Fix GCC 12 warning
Thread-Index: AQHYHtiyz9LUyAjRSUu2IalWh5Ct1KyQwgtg
Date:   Sun, 13 Feb 2022 02:20:27 +0000
Message-ID: <26dee09f5fc8420782e4556d86c55a04@AcuMS.aculab.com>
References: <1644518851-16847-1-git-send-email-victor.erminpour@oracle.com>
 <CAMj1kXEbGWs74M2CZSm6TWpD11mReFsk8z-UUqJt6b6vDCvAEQ@mail.gmail.com>
 <202202101415.43750CEE@keescook>
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From: Kees Cook
> Sent: 10 February 2022 23:47
...
> All that said, I think this patch could be improved.
> 
> I'd recommend, instead, just simply:
> 
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index f2f8f05662de..9e765d30da82 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -1671,13 +1671,14 @@ phys_addr_t __init acpi_iort_dma_get_max_cpu_address(void)
>  	end = ACPI_ADD_PTR(struct acpi_iort_node, iort, iort->header.length);
> 
>  	for (i = 0; i < iort->node_count; i++) {
> +		struct acpi_iort_named_component *ncomp;
> +		struct acpi_iort_root_complex *rc;
> +		phys_addr_t local_limit;
> +

I'd move them right to the top of the function.
No point hiding the declarations in the middle.

	David

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