* [dpdk-dev] [PATCH] kni: fix build on Linux < 3.14
@ 2018-10-26 21:40 Thomas Monjalon
2018-10-26 21:56 ` Thomas Monjalon
0 siblings, 1 reply; 4+ messages in thread
From: Thomas Monjalon @ 2018-10-26 21:40 UTC (permalink / raw)
To: Ferruh Yigit; +Cc: dev, phil.yang, gavin.hu
The atomic functions smp_load_acquire() and smp_store_release()
were introduced in Linux 3.14. Older kernels miss the functions:
kni_fifo.h:19:2: error:
implicit declaration of function ‘smp_load_acquire’
kni_fifo.h:30:2: error:
implicit declaration of function ‘smp_store_release’
The fallback is to drop the atomic barrier, as it was before
the commit below.
Fixes: 711859cd0d07 ("kni: fix kernel FIFO synchronization")
Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
---
kernel/linux/kni/kni_fifo.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/kernel/linux/kni/kni_fifo.h b/kernel/linux/kni/kni_fifo.h
index 2cb3a4a7b..3c0be311f 100644
--- a/kernel/linux/kni/kni_fifo.h
+++ b/kernel/linux/kni/kni_fifo.h
@@ -8,6 +8,13 @@
#include <exec-env/rte_kni_common.h>
+#ifndef smp_load_acquire
+#define smp_load_acquire(a) (*(a))
+#endif
+#ifndef smp_store_release
+#define smp_store_release(a, b) *(a) = (b)
+#endif
+
/**
* Adds num elements into the fifo. Return the number actually written
*/
--
2.19.0
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [dpdk-dev] [PATCH] kni: fix build on Linux < 3.14
2018-10-26 21:40 [dpdk-dev] [PATCH] kni: fix build on Linux < 3.14 Thomas Monjalon
@ 2018-10-26 21:56 ` Thomas Monjalon
2018-10-26 22:42 ` Ferruh Yigit
0 siblings, 1 reply; 4+ messages in thread
From: Thomas Monjalon @ 2018-10-26 21:56 UTC (permalink / raw)
To: Ferruh Yigit; +Cc: dev, phil.yang, gavin.hu, honnappa.nagarahalli
26/10/2018 23:40, Thomas Monjalon:
> The atomic functions smp_load_acquire() and smp_store_release()
> were introduced in Linux 3.14. Older kernels miss the functions:
>
> kni_fifo.h:19:2: error:
> implicit declaration of function ‘smp_load_acquire’
> kni_fifo.h:30:2: error:
> implicit declaration of function ‘smp_store_release’
>
> The fallback is to drop the atomic barrier, as it was before
> the commit below.
>
> Fixes: 711859cd0d07 ("kni: fix kernel FIFO synchronization")
>
> Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
> ---
> kernel/linux/kni/kni_fifo.h | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> --- a/kernel/linux/kni/kni_fifo.h
> +++ b/kernel/linux/kni/kni_fifo.h
We could add a comment here:
/* Skip some memory barriers on Linux < 3.14 */
> +#ifndef smp_load_acquire
> +#define smp_load_acquire(a) (*(a))
> +#endif
> +#ifndef smp_store_release
> +#define smp_store_release(a, b) *(a) = (b)
> +#endif
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [dpdk-dev] [PATCH] kni: fix build on Linux < 3.14
2018-10-26 21:56 ` Thomas Monjalon
@ 2018-10-26 22:42 ` Ferruh Yigit
2018-10-26 23:25 ` Thomas Monjalon
0 siblings, 1 reply; 4+ messages in thread
From: Ferruh Yigit @ 2018-10-26 22:42 UTC (permalink / raw)
To: Thomas Monjalon; +Cc: dev, phil.yang, gavin.hu, honnappa.nagarahalli
On 10/26/2018 10:56 PM, Thomas Monjalon wrote:
> 26/10/2018 23:40, Thomas Monjalon:
>> The atomic functions smp_load_acquire() and smp_store_release()
>> were introduced in Linux 3.14. Older kernels miss the functions:
>>
>> kni_fifo.h:19:2: error:
>> implicit declaration of function ‘smp_load_acquire’
>> kni_fifo.h:30:2: error:
>> implicit declaration of function ‘smp_store_release’
>>
>> The fallback is to drop the atomic barrier, as it was before
>> the commit below.
>>
>> Fixes: 711859cd0d07 ("kni: fix kernel FIFO synchronization")
>>
>> Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Tested-by: Ferruh Yigit <ferruh.yigit@intel.com>
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [dpdk-dev] [PATCH] kni: fix build on Linux < 3.14
2018-10-26 22:42 ` Ferruh Yigit
@ 2018-10-26 23:25 ` Thomas Monjalon
0 siblings, 0 replies; 4+ messages in thread
From: Thomas Monjalon @ 2018-10-26 23:25 UTC (permalink / raw)
To: dev; +Cc: Ferruh Yigit, phil.yang, gavin.hu, honnappa.nagarahalli
27/10/2018 00:42, Ferruh Yigit:
> On 10/26/2018 10:56 PM, Thomas Monjalon wrote:
> > 26/10/2018 23:40, Thomas Monjalon:
> >> The atomic functions smp_load_acquire() and smp_store_release()
> >> were introduced in Linux 3.14. Older kernels miss the functions:
> >>
> >> kni_fifo.h:19:2: error:
> >> implicit declaration of function ‘smp_load_acquire’
> >> kni_fifo.h:30:2: error:
> >> implicit declaration of function ‘smp_store_release’
> >>
> >> The fallback is to drop the atomic barrier, as it was before
> >> the commit below.
> >>
> >> Fixes: 711859cd0d07 ("kni: fix kernel FIFO synchronization")
> >>
> >> Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
>
> Tested-by: Ferruh Yigit <ferruh.yigit@intel.com>
Applied
^ permalink raw reply [flat|nested] 4+ messages in thread
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2018-10-26 21:40 [dpdk-dev] [PATCH] kni: fix build on Linux < 3.14 Thomas Monjalon
2018-10-26 21:56 ` Thomas Monjalon
2018-10-26 22:42 ` Ferruh Yigit
2018-10-26 23:25 ` Thomas Monjalon
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