linux-kernel - Re: [PATCH] ACPICA: fix -Wfallthrough

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Date:   Thu, 21 Jan 2021 10:06:12 +0000
From:   Jon Hunter <jonathanh@...dia.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Robert Moore <robert.moore@...el.com>,
        Erik Kaneda <erik.kaneda@...el.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>
CC:     <clang-built-linux@...glegroups.com>, Len Brown <lenb@...nel.org>,
        <linux-acpi@...r.kernel.org>, <devel@...ica.org>,
        <linux-kernel@...r.kernel.org>,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH] ACPICA: fix -Wfallthrough


On 11/11/2020 02:11, Nick Desaulniers wrote:
> The "fallthrough" pseudo-keyword was added as a portable way to denote
> intentional fallthrough. This code seemed to be using a mix of
> fallthrough comments that GCC recognizes, and some kind of lint marker.
> I'm guessing that linter hasn't been run in a while from the mixed use
> of the marker vs comments.
> 
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>


I know this is not the exact version that was merged, I can't find it on
the list, but looks like the version that was merged [0], is causing
build errors with older toolchains (GCC v6) ...

/dvs/git/dirty/git-master_l4t-upstream/kernel/drivers/acpi/acpica/dscontrol.c: In function ‘acpi_ds_exec_begin_control_op’:
/dvs/git/dirty/git-master_l4t-upstream/kernel/drivers/acpi/acpica/dscontrol.c:65:3: error: ‘ACPI_FALLTHROUGH’ undeclared (first use in this function)
   ACPI_FALLTHROUGH;
   ^~~~~~~~~~~~~~~~
/dvs/git/dirty/git-master_l4t-upstream/kernel/drivers/acpi/acpica/dscontrol.c:65:3: note: each undeclared identifier is reported only once for each function it appears in
/dvs/git/dirty/git-master_l4t-upstream/kernel/scripts/Makefile.build:287: recipe for target 'drivers/acpi/acpica/dscontrol.o' failed

Cheers
Jon

[0] https://github.com/acpica/acpica/commit/4b9135f5
	 
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