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* [PATCH] microblaze: add 'fallthrough' to memcpy/memset/memmove
@ 2021-04-21  2:20 Randy Dunlap
  2021-04-22  8:35 ` Michal Simek
  0 siblings, 1 reply; 2+ messages in thread
From: Randy Dunlap @ 2021-04-21  2:20 UTC (permalink / raw)
  To: linux-kernel; +Cc: Randy Dunlap, Michal Simek

Fix "fallthrough" warnings in microblaze memcpy/memset/memmove
library functions.

  CC      arch/microblaze/lib/memcpy.o
../arch/microblaze/lib/memcpy.c: In function 'memcpy':
../arch/microblaze/lib/memcpy.c:70:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
   70 |    --c;
../arch/microblaze/lib/memcpy.c:71:3: note: here
   71 |   case 2:
../arch/microblaze/lib/memcpy.c:73:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
   73 |    --c;
../arch/microblaze/lib/memcpy.c:74:3: note: here
   74 |   case 3:
../arch/microblaze/lib/memcpy.c:178:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
  178 |   *dst++ = *src++;
../arch/microblaze/lib/memcpy.c:179:2: note: here
  179 |  case 2:
../arch/microblaze/lib/memcpy.c:180:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
  180 |   *dst++ = *src++;
../arch/microblaze/lib/memcpy.c:181:2: note: here
  181 |  case 1:
  CC      arch/microblaze/lib/memset.o
../arch/microblaze/lib/memset.c: In function 'memset':
../arch/microblaze/lib/memset.c:71:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
   71 |    --n;
../arch/microblaze/lib/memset.c:72:3: note: here
   72 |   case 2:
../arch/microblaze/lib/memset.c:74:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
   74 |    --n;
../arch/microblaze/lib/memset.c:75:3: note: here
   75 |   case 3:
  CC      arch/microblaze/lib/memmove.o
../arch/microblaze/lib/memmove.c: In function 'memmove':
../arch/microblaze/lib/memmove.c:92:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
   92 |    --c;
../arch/microblaze/lib/memmove.c:93:3: note: here
   93 |   case 2:
../arch/microblaze/lib/memmove.c:95:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
   95 |    --c;
../arch/microblaze/lib/memmove.c:96:3: note: here
   96 |   case 1:
../arch/microblaze/lib/memmove.c:203:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
  203 |   *--dst = *--src;
../arch/microblaze/lib/memmove.c:204:2: note: here
  204 |  case 3:
../arch/microblaze/lib/memmove.c:205:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
  205 |   *--dst = *--src;
../arch/microblaze/lib/memmove.c:206:2: note: here
  206 |  case 2:
../arch/microblaze/lib/memmove.c:207:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
  207 |   *--dst = *--src;
../arch/microblaze/lib/memmove.c:208:2: note: here
  208 |  case 1:


Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Michal Simek <monstr@monstr.eu>
---
 arch/microblaze/lib/memcpy.c  |    4 ++++
 arch/microblaze/lib/memmove.c |    5 +++++
 arch/microblaze/lib/memset.c  |    2 ++
 3 files changed, 11 insertions(+)

--- linux-next-20210420.orig/arch/microblaze/lib/memcpy.c
+++ linux-next-20210420/arch/microblaze/lib/memcpy.c
@@ -68,9 +68,11 @@ void *memcpy(void *v_dst, const void *v_
 		case 1:
 			*dst++ = *src++;
 			--c;
+			fallthrough;
 		case 2:
 			*dst++ = *src++;
 			--c;
+			fallthrough;
 		case 3:
 			*dst++ = *src++;
 			--c;
@@ -176,8 +178,10 @@ void *memcpy(void *v_dst, const void *v_
 	switch (c) {
 	case 3:
 		*dst++ = *src++;
+		fallthrough;
 	case 2:
 		*dst++ = *src++;
+		fallthrough;
 	case 1:
 		*dst++ = *src++;
 	}
--- linux-next-20210420.orig/arch/microblaze/lib/memmove.c
+++ linux-next-20210420/arch/microblaze/lib/memmove.c
@@ -90,9 +90,11 @@ void *memmove(void *v_dst, const void *v
 		case 3:
 			*--dst = *--src;
 			--c;
+			fallthrough;
 		case 2:
 			*--dst = *--src;
 			--c;
+			fallthrough;
 		case 1:
 			*--dst = *--src;
 			--c;
@@ -201,10 +203,13 @@ void *memmove(void *v_dst, const void *v
 	switch (c) {
 	case 4:
 		*--dst = *--src;
+		fallthrough;
 	case 3:
 		*--dst = *--src;
+		fallthrough;
 	case 2:
 		*--dst = *--src;
+		fallthrough;
 	case 1:
 		*--dst = *--src;
 	}
--- linux-next-20210420.orig/arch/microblaze/lib/memset.c
+++ linux-next-20210420/arch/microblaze/lib/memset.c
@@ -69,9 +69,11 @@ void *memset(void *v_src, int c, __kerne
 		case 1:
 			*src++ = c;
 			--n;
+			fallthrough;
 		case 2:
 			*src++ = c;
 			--n;
+			fallthrough;
 		case 3:
 			*src++ = c;
 			--n;

^ permalink raw reply	[flat|nested] 2+ messages in thread
* Re: [PATCH] microblaze: add 'fallthrough' to memcpy/memset/memmove
  2021-04-21  2:20 [PATCH] microblaze: add 'fallthrough' to memcpy/memset/memmove Randy Dunlap
@ 2021-04-22  8:35 ` Michal Simek
  0 siblings, 0 replies; 2+ messages in thread
From: Michal Simek @ 2021-04-22  8:35 UTC (permalink / raw)
  To: Randy Dunlap, linux-kernel



On 4/21/21 4:20 AM, Randy Dunlap wrote:
> Fix "fallthrough" warnings in microblaze memcpy/memset/memmove
> library functions.
> 
>   CC      arch/microblaze/lib/memcpy.o
> ../arch/microblaze/lib/memcpy.c: In function 'memcpy':
> ../arch/microblaze/lib/memcpy.c:70:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    70 |    --c;
> ../arch/microblaze/lib/memcpy.c:71:3: note: here
>    71 |   case 2:
> ../arch/microblaze/lib/memcpy.c:73:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    73 |    --c;
> ../arch/microblaze/lib/memcpy.c:74:3: note: here
>    74 |   case 3:
> ../arch/microblaze/lib/memcpy.c:178:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
>   178 |   *dst++ = *src++;
> ../arch/microblaze/lib/memcpy.c:179:2: note: here
>   179 |  case 2:
> ../arch/microblaze/lib/memcpy.c:180:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
>   180 |   *dst++ = *src++;
> ../arch/microblaze/lib/memcpy.c:181:2: note: here
>   181 |  case 1:
>   CC      arch/microblaze/lib/memset.o
> ../arch/microblaze/lib/memset.c: In function 'memset':
> ../arch/microblaze/lib/memset.c:71:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    71 |    --n;
> ../arch/microblaze/lib/memset.c:72:3: note: here
>    72 |   case 2:
> ../arch/microblaze/lib/memset.c:74:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    74 |    --n;
> ../arch/microblaze/lib/memset.c:75:3: note: here
>    75 |   case 3:
>   CC      arch/microblaze/lib/memmove.o
> ../arch/microblaze/lib/memmove.c: In function 'memmove':
> ../arch/microblaze/lib/memmove.c:92:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    92 |    --c;
> ../arch/microblaze/lib/memmove.c:93:3: note: here
>    93 |   case 2:
> ../arch/microblaze/lib/memmove.c:95:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    95 |    --c;
> ../arch/microblaze/lib/memmove.c:96:3: note: here
>    96 |   case 1:
> ../arch/microblaze/lib/memmove.c:203:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
>   203 |   *--dst = *--src;
> ../arch/microblaze/lib/memmove.c:204:2: note: here
>   204 |  case 3:
> ../arch/microblaze/lib/memmove.c:205:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
>   205 |   *--dst = *--src;
> ../arch/microblaze/lib/memmove.c:206:2: note: here
>   206 |  case 2:
> ../arch/microblaze/lib/memmove.c:207:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
>   207 |   *--dst = *--src;
> ../arch/microblaze/lib/memmove.c:208:2: note: here
>   208 |  case 1:
> 
> 
> Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
> Cc: Michal Simek <monstr@monstr.eu>
> ---
>  arch/microblaze/lib/memcpy.c  |    4 ++++
>  arch/microblaze/lib/memmove.c |    5 +++++
>  arch/microblaze/lib/memset.c  |    2 ++
>  3 files changed, 11 insertions(+)
> 
> --- linux-next-20210420.orig/arch/microblaze/lib/memcpy.c
> +++ linux-next-20210420/arch/microblaze/lib/memcpy.c
> @@ -68,9 +68,11 @@ void *memcpy(void *v_dst, const void *v_
>  		case 1:
>  			*dst++ = *src++;
>  			--c;
> +			fallthrough;
>  		case 2:
>  			*dst++ = *src++;
>  			--c;
> +			fallthrough;
>  		case 3:
>  			*dst++ = *src++;
>  			--c;
> @@ -176,8 +178,10 @@ void *memcpy(void *v_dst, const void *v_
>  	switch (c) {
>  	case 3:
>  		*dst++ = *src++;
> +		fallthrough;
>  	case 2:
>  		*dst++ = *src++;
> +		fallthrough;
>  	case 1:
>  		*dst++ = *src++;
>  	}
> --- linux-next-20210420.orig/arch/microblaze/lib/memmove.c
> +++ linux-next-20210420/arch/microblaze/lib/memmove.c
> @@ -90,9 +90,11 @@ void *memmove(void *v_dst, const void *v
>  		case 3:
>  			*--dst = *--src;
>  			--c;
> +			fallthrough;
>  		case 2:
>  			*--dst = *--src;
>  			--c;
> +			fallthrough;
>  		case 1:
>  			*--dst = *--src;
>  			--c;
> @@ -201,10 +203,13 @@ void *memmove(void *v_dst, const void *v
>  	switch (c) {
>  	case 4:
>  		*--dst = *--src;
> +		fallthrough;
>  	case 3:
>  		*--dst = *--src;
> +		fallthrough;
>  	case 2:
>  		*--dst = *--src;
> +		fallthrough;
>  	case 1:
>  		*--dst = *--src;
>  	}
> --- linux-next-20210420.orig/arch/microblaze/lib/memset.c
> +++ linux-next-20210420/arch/microblaze/lib/memset.c
> @@ -69,9 +69,11 @@ void *memset(void *v_src, int c, __kerne
>  		case 1:
>  			*src++ = c;
>  			--n;
> +			fallthrough;
>  		case 2:
>  			*src++ = c;
>  			--n;
> +			fallthrough;
>  		case 3:
>  			*src++ = c;
>  			--n;
> 

Applied.

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Xilinx Microblaze
Maintainer of Linux kernel - Xilinx Zynq ARM and ZynqMP ARM64 SoCs
U-Boot custodian - Xilinx Microblaze/Zynq/ZynqMP/Versal SoCs




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2021-04-21  2:20 [PATCH] microblaze: add 'fallthrough' to memcpy/memset/memmove Randy Dunlap
2021-04-22  8:35 ` Michal Simek

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