Re: buildworld broke in sbin/nvmecontrol; r240620 suspected

From: Jim Harris <jim.harris_at_gmail.com>
Date: Tue, 18 Sep 2012 10:09:54 -0700
On Tue, Sep 18, 2012 at 8:28 AM, Garrett Cooper <yanegomi_at_gmail.com> wrote:
> On Sep 18, 2012, at 5:53 AM, David Wolfskill <david_at_catwhisker.org> wrote:
>
>> This was on:
>>
>> FreeBSD g1-227.catwhisker.org 10.0-CURRENT FreeBSD 10.0-CURRENT #681 240597M: Mon Sep 17 15:34:41 PDT 2012     root_at_d134.dwolf.juniper.net.:/usr/obj/usr/src/sys/CANARY  i386
>>
>> using clang as the C compiler:
>>
>> ...
>> ===> sbin/nvmecontrol (all)
>> clang -O2 -pipe  -std=gnu99 -Qunused-arguments -fstack-protector -Wsystem-headers -Werror -Wall -Wno-format-y2k -W -Wno-unused-parameter -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wunused-parameter -Wcast-align -Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls -Wold-style-definition -Wno-pointer-sign -Wno-empty-body -Wno-string-plus-int -c /usr/src/sbin/nvmecontrol/nvmecontrol.c
>> /usr/src/sbin/nvmecontrol/nvmecontrol.c:77:6: error: cast from 'struct nvme_controller_data *' to 'uint32_t *' (aka 'unsigned int *') increases required alignment from 1 to 4 [-Werror,-Wcast-align]
>>        p = (uint32_t *)cdata;
>>            ^~~~~~~~~~~~~~~~~
>> 1 error generated.
>> *** [nvmecontrol.o] Error code 1
>> 1 error
>> *** [all] Error code 2
>> 1 error
>> *** [sbin.all__D] Error code 2
>
> Probably should be using memcpy for that.
> Thanks!
> -Garrett

I think adding __aligned(4) to struct nvme_controller_data is the better way
to go.  This structure is already marked as __packed which seems to
cause clang to think the structure could be unaligned.  I've confirmed
this fixes the issue.

An an FYI - If I remove the __packed specifier (and do not add __aligned),
clang compiles without nvmecontrol without warning as well.

Regards,

-Jim
Received on Tue Sep 18 2012 - 15:09:55 UTC

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