* [PATCH] block/qcow2-cluster: Add missing "fallthrough" annotation
@ 2020-09-08 7:00 Thomas Huth
2020-09-08 8:43 ` Philippe Mathieu-Daudé
2020-09-08 14:42 ` Kevin Wolf
0 siblings, 2 replies; 4+ messages in thread
From: Thomas Huth @ 2020-09-08 7:00 UTC (permalink / raw)
To: qemu-devel, Kevin Wolf, Max Reitz; +Cc: qemu-block
When compiling with -Werror=implicit-fallthrough, the compiler currently
complains:
../../devel/qemu/block/qcow2-cluster.c: In function ‘cluster_needs_new_alloc’:
../../devel/qemu/block/qcow2-cluster.c:1320:12: error: this statement may fall
through [-Werror=implicit-fallthrough=]
if (l2_entry & QCOW_OFLAG_COPIED) {
^
../../devel/qemu/block/qcow2-cluster.c:1323:5: note: here
case QCOW2_CLUSTER_UNALLOCATED:
^~~~
It's quite obvious that the fallthrough is intended here, so let's add
a comment to silence the compiler warning.
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
block/qcow2-cluster.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 996b3314f4..fcdf7af8e6 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -1320,6 +1320,7 @@ static bool cluster_needs_new_alloc(BlockDriverState *bs, uint64_t l2_entry)
if (l2_entry & QCOW_OFLAG_COPIED) {
return false;
}
+ /* fallthrough */
case QCOW2_CLUSTER_UNALLOCATED:
case QCOW2_CLUSTER_COMPRESSED:
case QCOW2_CLUSTER_ZERO_PLAIN:
--
2.18.2
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH] block/qcow2-cluster: Add missing "fallthrough" annotation
2020-09-08 7:00 [PATCH] block/qcow2-cluster: Add missing "fallthrough" annotation Thomas Huth
@ 2020-09-08 8:43 ` Philippe Mathieu-Daudé
2020-09-08 9:31 ` Thomas Huth
2020-09-08 14:42 ` Kevin Wolf
1 sibling, 1 reply; 4+ messages in thread
From: Philippe Mathieu-Daudé @ 2020-09-08 8:43 UTC (permalink / raw)
To: Thomas Huth, qemu-devel, Kevin Wolf, Max Reitz; +Cc: Paolo Bonzini, qemu-block
Hi Thomas,
On 9/8/20 9:00 AM, Thomas Huth wrote:
> When compiling with -Werror=implicit-fallthrough, the compiler currently
> complains:
Do you know what is missing to add this in configure::warn_flags?
>
> ../../devel/qemu/block/qcow2-cluster.c: In function ‘cluster_needs_new_alloc’:
> ../../devel/qemu/block/qcow2-cluster.c:1320:12: error: this statement may fall
> through [-Werror=implicit-fallthrough=]
> if (l2_entry & QCOW_OFLAG_COPIED) {
> ^
> ../../devel/qemu/block/qcow2-cluster.c:1323:5: note: here
> case QCOW2_CLUSTER_UNALLOCATED:
> ^~~~
>
> It's quite obvious that the fallthrough is intended here, so let's add
> a comment to silence the compiler warning.
>
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
> block/qcow2-cluster.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
> index 996b3314f4..fcdf7af8e6 100644
> --- a/block/qcow2-cluster.c
> +++ b/block/qcow2-cluster.c
> @@ -1320,6 +1320,7 @@ static bool cluster_needs_new_alloc(BlockDriverState *bs, uint64_t l2_entry)
> if (l2_entry & QCOW_OFLAG_COPIED) {
> return false;
> }
> + /* fallthrough */
> case QCOW2_CLUSTER_UNALLOCATED:
> case QCOW2_CLUSTER_COMPRESSED:
> case QCOW2_CLUSTER_ZERO_PLAIN:
>
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] block/qcow2-cluster: Add missing "fallthrough" annotation
2020-09-08 8:43 ` Philippe Mathieu-Daudé
@ 2020-09-08 9:31 ` Thomas Huth
0 siblings, 0 replies; 4+ messages in thread
From: Thomas Huth @ 2020-09-08 9:31 UTC (permalink / raw)
To: Philippe Mathieu-Daudé, qemu-devel, Kevin Wolf, Max Reitz
Cc: Paolo Bonzini, qemu-block
On 08/09/2020 10.43, Philippe Mathieu-Daudé wrote:
> Hi Thomas,
>
> On 9/8/20 9:00 AM, Thomas Huth wrote:
>> When compiling with -Werror=implicit-fallthrough, the compiler currently
>> complains:
>
> Do you know what is missing to add this in configure::warn_flags?
Quite a bit, I think. I'm fixing it step by step...
Thomas
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] block/qcow2-cluster: Add missing "fallthrough" annotation
2020-09-08 7:00 [PATCH] block/qcow2-cluster: Add missing "fallthrough" annotation Thomas Huth
2020-09-08 8:43 ` Philippe Mathieu-Daudé
@ 2020-09-08 14:42 ` Kevin Wolf
1 sibling, 0 replies; 4+ messages in thread
From: Kevin Wolf @ 2020-09-08 14:42 UTC (permalink / raw)
To: Thomas Huth; +Cc: qemu-devel, qemu-block, Max Reitz
Am 08.09.2020 um 09:00 hat Thomas Huth geschrieben:
> When compiling with -Werror=implicit-fallthrough, the compiler currently
> complains:
>
> ../../devel/qemu/block/qcow2-cluster.c: In function ‘cluster_needs_new_alloc’:
> ../../devel/qemu/block/qcow2-cluster.c:1320:12: error: this statement may fall
> through [-Werror=implicit-fallthrough=]
> if (l2_entry & QCOW_OFLAG_COPIED) {
> ^
> ../../devel/qemu/block/qcow2-cluster.c:1323:5: note: here
> case QCOW2_CLUSTER_UNALLOCATED:
> ^~~~
>
> It's quite obvious that the fallthrough is intended here, so let's add
> a comment to silence the compiler warning.
>
> Signed-off-by: Thomas Huth <thuth@redhat.com>
Thanks, applied to the block branch.
Kevin
^ permalink raw reply [flat|nested] 4+ messages in thread
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2020-09-08 7:00 [PATCH] block/qcow2-cluster: Add missing "fallthrough" annotation Thomas Huth
2020-09-08 8:43 ` Philippe Mathieu-Daudé
2020-09-08 9:31 ` Thomas Huth
2020-09-08 14:42 ` Kevin Wolf
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