On Wed, Sep 26, 2018 at 04:20:55PM -0700, Nathan Chancellor wrote:
> Clang emits the following warning:
>
> drivers/staging/rtl8723bs/os_dep/sdio_intf.c:25:36: warning: variable
> 'acpi_ids' is not needed and will not be emitted
> [-Wunneeded-internal-declaration]
> static const struct acpi_device_id acpi_ids[] = {
> ^
> 1 warning generated.
>
> Mark acpi_ids with the attribute __used, which makes it clear to Clang
> that we don't want this warning while not inhibiting Clang's dead code
> elimination from removing the unreferenced internal symbol when moving
> the data to the globally available symbol with MODULE_DEVICE_TABLE.
>
> $ nm -S drivers/staging/rtl8723bs/os_dep/sdio_intf.o | grep acpi
> 0000000000000000 0000000000000040 R __mod_acpi__acpi_ids_device_table
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/169
> Suggested-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
> Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
> ---
> drivers/staging/rtl8723bs/os_dep/sdio_intf.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/rtl8723bs/os_dep/sdio_intf.c b/drivers/staging/rtl8723bs/os_dep/sdio_intf.c
> index 6d02904de63f..7c03b69b8ed3 100644
> --- a/drivers/staging/rtl8723bs/os_dep/sdio_intf.c
> +++ b/drivers/staging/rtl8723bs/os_dep/sdio_intf.c
> @@ -22,7 +22,7 @@ static const struct sdio_device_id sdio_ids[] =
> { SDIO_DEVICE(0x024c, 0xb723), },
> { /* end: all zeroes */ },
> };
> -static const struct acpi_device_id acpi_ids[] = {
> +static const struct acpi_device_id acpi_ids[] __used = {
Can't we put __used somewhere in the MODULE_DEVICE_TABLE() macro so we
don't have to go adding it to all individual entries?
thanks,
greg k-h
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