* [Qemu-devel] [PATCH v2] kvm: Fix enable_cap helpers on older gcc
@ 2014-05-12 9:51 Alexander Graf
2014-05-12 9:56 ` Thomas Huth
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Alexander Graf @ 2014-05-12 9:51 UTC (permalink / raw)
To: qemu-devel; +Cc: Cornelia Huck, Thomas Huth
Commit 40f1ee27aa1 introduced handy helpers for enable_cap calls on
vcpu and vm level. Unfortunately some older gcc versions (4.7.1, 4.6)
seem to choke on signedness detection in inline created variables:
target-ppc/kvm.c: In function 'kvmppc_booke_watchdog_enable':
target-ppc/kvm.c:1302:21: error: comparison of unsigned expression < 0 is always false [-Werror=type-limits]
target-ppc/kvm.c: In function 'kvmppc_set_papr':
target-ppc/kvm.c:1504:21: error: comparison of unsigned expression < 0 is always false [-Werror=type-limits]
However - thanks to Thomas Huth for the suggestion - we can just cast the
offending potentially 0 value to a signed type, making the comparison signed.
Signed-off-by: Alexander Graf <agraf@suse.de>
---
v1 -> v2:
- only do cast, leaving readability intact
---
include/sysemu/kvm.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index 192fe89..76c39cc 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -302,7 +302,7 @@ int kvm_check_extension(KVMState *s, unsigned int extension);
}; \
uint64_t args_tmp[] = { __VA_ARGS__ }; \
int i; \
- for (i = 0; i < ARRAY_SIZE(args_tmp) && \
+ for (i = 0; i < (int)ARRAY_SIZE(args_tmp) && \
i < ARRAY_SIZE(cap.args); i++) { \
cap.args[i] = args_tmp[i]; \
} \
@@ -317,7 +317,7 @@ int kvm_check_extension(KVMState *s, unsigned int extension);
}; \
uint64_t args_tmp[] = { __VA_ARGS__ }; \
int i; \
- for (i = 0; i < ARRAY_SIZE(args_tmp) && \
+ for (i = 0; i < (int)ARRAY_SIZE(args_tmp) && \
i < ARRAY_SIZE(cap.args); i++) { \
cap.args[i] = args_tmp[i]; \
} \
--
1.8.1.4
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] [PATCH v2] kvm: Fix enable_cap helpers on older gcc
2014-05-12 9:51 [Qemu-devel] [PATCH v2] kvm: Fix enable_cap helpers on older gcc Alexander Graf
@ 2014-05-12 9:56 ` Thomas Huth
2014-05-12 10:15 ` Cornelia Huck
2014-05-20 10:53 ` Cornelia Huck
2 siblings, 0 replies; 6+ messages in thread
From: Thomas Huth @ 2014-05-12 9:56 UTC (permalink / raw)
To: Alexander Graf; +Cc: Cornelia Huck, qemu-devel
On Mon, 12 May 2014 11:51:37 +0200
Alexander Graf <agraf@suse.de> wrote:
> Commit 40f1ee27aa1 introduced handy helpers for enable_cap calls on
> vcpu and vm level. Unfortunately some older gcc versions (4.7.1, 4.6)
> seem to choke on signedness detection in inline created variables:
>
> target-ppc/kvm.c: In function 'kvmppc_booke_watchdog_enable':
> target-ppc/kvm.c:1302:21: error: comparison of unsigned expression < 0 is always false [-Werror=type-limits]
> target-ppc/kvm.c: In function 'kvmppc_set_papr':
> target-ppc/kvm.c:1504:21: error: comparison of unsigned expression < 0 is always false [-Werror=type-limits]
>
> However - thanks to Thomas Huth for the suggestion - we can just cast the
> offending potentially 0 value to a signed type, making the comparison signed.
>
> Signed-off-by: Alexander Graf <agraf@suse.de>
>
> ---
>
> v1 -> v2:
>
> - only do cast, leaving readability intact
>
> ---
> include/sysemu/kvm.h | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
> index 192fe89..76c39cc 100644
> --- a/include/sysemu/kvm.h
> +++ b/include/sysemu/kvm.h
> @@ -302,7 +302,7 @@ int kvm_check_extension(KVMState *s, unsigned int extension);
> }; \
> uint64_t args_tmp[] = { __VA_ARGS__ }; \
> int i; \
> - for (i = 0; i < ARRAY_SIZE(args_tmp) && \
> + for (i = 0; i < (int)ARRAY_SIZE(args_tmp) && \
> i < ARRAY_SIZE(cap.args); i++) { \
> cap.args[i] = args_tmp[i]; \
> } \
> @@ -317,7 +317,7 @@ int kvm_check_extension(KVMState *s, unsigned int extension);
> }; \
> uint64_t args_tmp[] = { __VA_ARGS__ }; \
> int i; \
> - for (i = 0; i < ARRAY_SIZE(args_tmp) && \
> + for (i = 0; i < (int)ARRAY_SIZE(args_tmp) && \
> i < ARRAY_SIZE(cap.args); i++) { \
> cap.args[i] = args_tmp[i]; \
> } \
Looks much better this way :-)
Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] [PATCH v2] kvm: Fix enable_cap helpers on older gcc
2014-05-12 9:51 [Qemu-devel] [PATCH v2] kvm: Fix enable_cap helpers on older gcc Alexander Graf
2014-05-12 9:56 ` Thomas Huth
@ 2014-05-12 10:15 ` Cornelia Huck
2014-05-12 10:17 ` Alexander Graf
2014-05-20 10:53 ` Cornelia Huck
2 siblings, 1 reply; 6+ messages in thread
From: Cornelia Huck @ 2014-05-12 10:15 UTC (permalink / raw)
To: Alexander Graf; +Cc: qemu-devel, Thomas Huth
On Mon, 12 May 2014 11:51:37 +0200
Alexander Graf <agraf@suse.de> wrote:
> Commit 40f1ee27aa1 introduced handy helpers for enable_cap calls on
> vcpu and vm level. Unfortunately some older gcc versions (4.7.1, 4.6)
> seem to choke on signedness detection in inline created variables:
>
> target-ppc/kvm.c: In function 'kvmppc_booke_watchdog_enable':
> target-ppc/kvm.c:1302:21: error: comparison of unsigned expression < 0 is always false [-Werror=type-limits]
> target-ppc/kvm.c: In function 'kvmppc_set_papr':
> target-ppc/kvm.c:1504:21: error: comparison of unsigned expression < 0 is always false [-Werror=type-limits]
>
> However - thanks to Thomas Huth for the suggestion - we can just cast the
> offending potentially 0 value to a signed type, making the comparison signed.
>
> Signed-off-by: Alexander Graf <agraf@suse.de>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
I assume you will take this through your tree?
>
> ---
>
> v1 -> v2:
>
> - only do cast, leaving readability intact
>
> ---
> include/sysemu/kvm.h | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
> index 192fe89..76c39cc 100644
> --- a/include/sysemu/kvm.h
> +++ b/include/sysemu/kvm.h
> @@ -302,7 +302,7 @@ int kvm_check_extension(KVMState *s, unsigned int extension);
> }; \
> uint64_t args_tmp[] = { __VA_ARGS__ }; \
> int i; \
> - for (i = 0; i < ARRAY_SIZE(args_tmp) && \
> + for (i = 0; i < (int)ARRAY_SIZE(args_tmp) && \
> i < ARRAY_SIZE(cap.args); i++) { \
> cap.args[i] = args_tmp[i]; \
> } \
> @@ -317,7 +317,7 @@ int kvm_check_extension(KVMState *s, unsigned int extension);
> }; \
> uint64_t args_tmp[] = { __VA_ARGS__ }; \
> int i; \
> - for (i = 0; i < ARRAY_SIZE(args_tmp) && \
> + for (i = 0; i < (int)ARRAY_SIZE(args_tmp) && \
> i < ARRAY_SIZE(cap.args); i++) { \
> cap.args[i] = args_tmp[i]; \
> } \
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] [PATCH v2] kvm: Fix enable_cap helpers on older gcc
2014-05-12 10:15 ` Cornelia Huck
@ 2014-05-12 10:17 ` Alexander Graf
0 siblings, 0 replies; 6+ messages in thread
From: Alexander Graf @ 2014-05-12 10:17 UTC (permalink / raw)
To: Cornelia Huck; +Cc: qemu-devel, Thomas Huth
On 12.05.14 12:15, Cornelia Huck wrote:
> On Mon, 12 May 2014 11:51:37 +0200
> Alexander Graf <agraf@suse.de> wrote:
>
>> Commit 40f1ee27aa1 introduced handy helpers for enable_cap calls on
>> vcpu and vm level. Unfortunately some older gcc versions (4.7.1, 4.6)
>> seem to choke on signedness detection in inline created variables:
>>
>> target-ppc/kvm.c: In function 'kvmppc_booke_watchdog_enable':
>> target-ppc/kvm.c:1302:21: error: comparison of unsigned expression < 0 is always false [-Werror=type-limits]
>> target-ppc/kvm.c: In function 'kvmppc_set_papr':
>> target-ppc/kvm.c:1504:21: error: comparison of unsigned expression < 0 is always false [-Werror=type-limits]
>>
>> However - thanks to Thomas Huth for the suggestion - we can just cast the
>> offending potentially 0 value to a signed type, making the comparison signed.
>>
>> Signed-off-by: Alexander Graf <agraf@suse.de>
> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
>
> I assume you will take this through your tree?
Yeah, without I can't compile :)
Alex
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] [PATCH v2] kvm: Fix enable_cap helpers on older gcc
2014-05-12 9:51 [Qemu-devel] [PATCH v2] kvm: Fix enable_cap helpers on older gcc Alexander Graf
2014-05-12 9:56 ` Thomas Huth
2014-05-12 10:15 ` Cornelia Huck
@ 2014-05-20 10:53 ` Cornelia Huck
2014-05-20 10:53 ` Alexander Graf
2 siblings, 1 reply; 6+ messages in thread
From: Cornelia Huck @ 2014-05-20 10:53 UTC (permalink / raw)
To: Alexander Graf; +Cc: qemu-devel, Thomas Huth
On Mon, 12 May 2014 11:51:37 +0200
Alexander Graf <agraf@suse.de> wrote:
> Commit 40f1ee27aa1 introduced handy helpers for enable_cap calls on
> vcpu and vm level. Unfortunately some older gcc versions (4.7.1, 4.6)
> seem to choke on signedness detection in inline created variables:
>
> target-ppc/kvm.c: In function 'kvmppc_booke_watchdog_enable':
> target-ppc/kvm.c:1302:21: error: comparison of unsigned expression < 0 is always false [-Werror=type-limits]
> target-ppc/kvm.c: In function 'kvmppc_set_papr':
> target-ppc/kvm.c:1504:21: error: comparison of unsigned expression < 0 is always false [-Werror=type-limits]
>
> However - thanks to Thomas Huth for the suggestion - we can just cast the
> offending potentially 0 value to a signed type, making the comparison signed.
>
> Signed-off-by: Alexander Graf <agraf@suse.de>
>
Mind if I take this through s390-next instead of your tree, so I can
send a pull request with clean conscience?
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] [PATCH v2] kvm: Fix enable_cap helpers on older gcc
2014-05-20 10:53 ` Cornelia Huck
@ 2014-05-20 10:53 ` Alexander Graf
0 siblings, 0 replies; 6+ messages in thread
From: Alexander Graf @ 2014-05-20 10:53 UTC (permalink / raw)
To: Cornelia Huck; +Cc: qemu-devel, Thomas Huth
On 20.05.14 12:53, Cornelia Huck wrote:
> On Mon, 12 May 2014 11:51:37 +0200
> Alexander Graf <agraf@suse.de> wrote:
>
>> Commit 40f1ee27aa1 introduced handy helpers for enable_cap calls on
>> vcpu and vm level. Unfortunately some older gcc versions (4.7.1, 4.6)
>> seem to choke on signedness detection in inline created variables:
>>
>> target-ppc/kvm.c: In function 'kvmppc_booke_watchdog_enable':
>> target-ppc/kvm.c:1302:21: error: comparison of unsigned expression < 0 is always false [-Werror=type-limits]
>> target-ppc/kvm.c: In function 'kvmppc_set_papr':
>> target-ppc/kvm.c:1504:21: error: comparison of unsigned expression < 0 is always false [-Werror=type-limits]
>>
>> However - thanks to Thomas Huth for the suggestion - we can just cast the
>> offending potentially 0 value to a signed type, making the comparison signed.
>>
>> Signed-off-by: Alexander Graf <agraf@suse.de>
>>
> Mind if I take this through s390-next instead of your tree, so I can
> send a pull request with clean conscience?
>
Sure, whoever hits master first wins ;)
Alex
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2014-05-20 10:53 UTC | newest]
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2014-05-12 9:51 [Qemu-devel] [PATCH v2] kvm: Fix enable_cap helpers on older gcc Alexander Graf
2014-05-12 9:56 ` Thomas Huth
2014-05-12 10:15 ` Cornelia Huck
2014-05-12 10:17 ` Alexander Graf
2014-05-20 10:53 ` Cornelia Huck
2014-05-20 10:53 ` Alexander Graf
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