On Tue, Mar 30, 2021 at 04:02:49PM -0700, Jian Cai wrote:
> This fixes the mismatch of alignments between csd and its use as an
> argument to smp_call_function_single_async, which causes build failure
> when -Walign-mismatch in Clang is used.
>
> Link:
> http://crrev.com/c/1193732
That link does not work. You probably meant
http://crbug.com/1193732
You'll probably want drop the link and to copy the relevant information
directly into the patch description. Generate the error with an upstream
kernel and cut-and-paste the output here.
For others, the observed error message is:
block/blk-mq.c:622:44: error: passing 8-byte aligned argument to 32-byte
aligned parameter 2 of 'smp_call_function_single_async' may result
in an unaligned pointer access [-Werror,-Walign-mismatch]
Thanks,
Guenter
>
> Suggested-by: Guenter Roeck <li...@roeck-us.net>
> Signed-off-by: Jian Cai <jian...@google.com>
> ---
> include/linux/blkdev.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index bc6bc8383b43..3b92330d95ad 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -231,7 +231,7 @@ struct request {
> unsigned long deadline;
>
> union {
> - struct __call_single_data csd;
> + call_single_data_t csd;
> u64 fifo_time;
> };
>
> --
> 2.31.0.291.g576ba9dcdaf-goog
>
