From: Thomas Zimmermann <tzimmermann@xxxxxxx>
Date: 2020-10-23 15:13:30
To: Bernard Zhao <bernard@xxxxxxxx>,Dave Airlie <airlied@xxxxxxxxxx>,David Airlie <airlied@xxxxxxxx>,Daniel Vetter <daniel@xxxxxxxx>,dri-devel@xxxxxxxxxxxxxxxxxxxxx,linux-kernel@xxxxxxxxxxxxxxx
Cc: opensource.kernel@xxxxxxxx
Subject: Re: [PATCH] gpu/drm/mgag200:remove break after return>Hi
>
>On 23.10.20 09:00, Bernard Zhao wrote:
>> In function mgag200_set_pci_regs, there are some switch cases
>> returned, then break. These break will never run.
>> This patch is to make the code a bit readable.
>>
>> Signed-off-by: Bernard Zhao <bernard@xxxxxxxx>
>> ---
>> drivers/gpu/drm/mgag200/mgag200_mode.c | 5 +----
>> 1 file changed, 1 insertion(+), 4 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
>> index 38672f9e5c4f..de873a5d276e 100644
>> --- a/drivers/gpu/drm/mgag200/mgag200_mode.c
>> +++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
>> @@ -794,20 +794,17 @@ static int mgag200_crtc_set_plls(struct mga_device *mdev, long clock)
>> case G200_SE_A:
>> case G200_SE_B:
>> return mga_g200se_set_plls(mdev, clock);
>> - break;
>> case G200_WB:
>> case G200_EW3:
>> return mga_g200wb_set_plls(mdev, clock);
>> - break;
>> case G200_EV:
>> return mga_g200ev_set_plls(mdev, clock);
>> - break;
>> case G200_EH:
>> case G200_EH3:
>> return mga_g200eh_set_plls(mdev, clock);
>> - break;
>> case G200_ER:
>> return mga_g200er_set_plls(mdev, clock);
>> + default:
>
>No default case here. If one of the enum values is not handled by the
>switch, the compiler should warn about it.
Hi
For this point I was a little confused, about this switch variable "mdev->type", my understanding is that this variable`s value can be certain only when the code is running.
How does the compiler warn this("If one of the enum values is not handled") before the code runs?
BR//Bernard
>Best regards
>Thomas
>
>> break;
>> }
>>
>>
>
>--
>Thomas Zimmermann
>Graphics Driver Developer
>SUSE Software Solutions Germany GmbH
>Maxfeldstr. 5, 90409 Nürnberg, Germany
>(HRB 36809, AG Nürnberg)
>Geschäftsführer: Felix Imendörffer
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