[PATCH] clk: samsung: s3c: Mark expected switch fall-through

[PATCH] clk: samsung: s3c: Mark expected switch fall-through

[Gustavo A. R. Silva]

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Notice that in this particular case I replaced the comma wiht a dash,
which is what GCC is expecting to find when there are other comments
in the same line in which "fall through" appears.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
This code was compiled with GCC 7.3.0

 drivers/clk/samsung/clk-s3c2443.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/samsung/clk-s3c2443.c b/drivers/clk/samsung/clk-s3c2443.c
index c46e6d5..7ebb87f 100644
--- a/drivers/clk/samsung/clk-s3c2443.c
+++ b/drivers/clk/samsung/clk-s3c2443.c
@@ -429,7 +429,7 @@ void __init s3c2443_common_clk_init(struct device_node *np, unsigned long xti_f,
 				ARRAY_SIZE(s3c2450_gates));
 		samsung_clk_register_alias(ctx, s3c2450_aliases,
 				ARRAY_SIZE(s3c2450_aliases));
-		/* fall through, as s3c2450 extends the s3c2416 clocks */
+		/* fall through - as s3c2450 extends the s3c2416 clocks */
 	case S3C2416:
 		samsung_clk_register_div(ctx, s3c2416_dividers,
 				ARRAY_SIZE(s3c2416_dividers));
-- 
2.7.4

[PATCH] clk: samsung: s3c: Mark expected switch fall-through

[Stephen Boyd]

Quoting Gustavo A. R. Silva (2018-04-03 18:09:31)
> In preparation to enabling -Wimplicit-fallthrough, mark switch cases
> where we are expecting to fall through.
> 
> Notice that in this particular case I replaced the comma wiht a dash,

s/wiht/with/

> which is what GCC is expecting to find when there are other comments
> in the same line in which "fall through" appears.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
> ---
> This code was compiled with GCC 7.3.0

What's the GCC warning? Please include in the commit text.

Also what's the implicit-fallthrough level you're using? 3? Can you file
a bug so GCC can update their regex to accept a comma in addition to
whitespace characters?

And maybe we can change the level to 2 or 1 in the kernel's makefile so
we don't need to patch comments for this.

[PATCH] clk: samsung: s3c: Mark expected switch fall-through

[Gustavo A. R. Silva]

On 04/05/2018 03:24 PM, Stephen Boyd wrote:
> Quoting Gustavo A. R. Silva (2018-04-03 18:09:31)
>> In preparation to enabling -Wimplicit-fallthrough, mark switch cases
>> where we are expecting to fall through.
>>
>> Notice that in this particular case I replaced the comma wiht a dash,
> 
> s/wiht/with/
> 

Thanks for this.

>> which is what GCC is expecting to find when there are other comments
>> in the same line in which "fall through" appears.
>>
>> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
>> ---
>> This code was compiled with GCC 7.3.0
> 
> What's the GCC warning? Please include in the commit text.
> 

drivers/clk/samsung/clk-s3c2443.c:430:3: warning: this statement may 
fall through [-Wimplicit-fallthrough=]
    samsung_clk_register_alias(ctx, s3c2450_aliases,
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      ARRAY_SIZE(s3c2450_aliases));
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/clk/samsung/clk-s3c2443.c:433:2: note: here
   case S3C2416:
   ^~~~


> Also what's the implicit-fallthrough level you're using? 3? Can you file
> a bug so GCC can update their regex to accept a comma in addition to
> whitespace characters?
> 

Yeah, I can talk to the GCC guys about that.

> And maybe we can change the level to 2 or 1 in the kernel's makefile so
> we don't need to patch comments for this.
> 

Yeah, with level 2 I don't get that warning.

Thanks
--
Gustavo