From: Wathsala Wathawana Vithanage <wathsala.vithanage@arm.com>
To: Daniel Gregory <daniel.gregory@bytedance.com>,
Ruifeng Wang <Ruifeng.Wang@arm.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
Punit Agrawal <punit.agrawal@bytedance.com>,
Liang Ma <liangma@bytedance.com>, nd <nd@arm.com>,
nd <nd@arm.com>
Subject: RE: [PATCH] eal/arm: replace RTE_BUILD_BUG on non-constant
Date: Sat, 11 May 2024 16:48:56 +0000 [thread overview]
Message-ID: <AM0PR08MB5073F5216962F3D1AA5C89A09FE02@AM0PR08MB5073.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <20240502142116.63760-1-daniel.gregory@bytedance.com>
> Subject: [PATCH] eal/arm: replace RTE_BUILD_BUG on non-constant
>
> The ARM implementation of rte_pause uses RTE_BUILD_BUG_ON to check
> memorder, which is not constant. This causes compile errors when it is
> enabled with RTE_ARM_USE_WFE. eg.
Use of wfe based rte_wait_until_equal_ implementations had performance issues
when used in lock free data structures like rte_ring.
To prevent these functions from getting included RTE_ARM_USE_WFE was
introduced some time back and this issue has been hiding so far because of that.
Solution looks good to me.
>
> ../lib/eal/arm/include/rte_pause_64.h: In function ‘rte_wait_until_equal_16’:
> ../lib/eal/include/rte_common.h:530:56: error: expression in static assertion
> is not constant
> 530 | #define RTE_BUILD_BUG_ON(condition) do {
> static_assert(!(condition), #condition); } while (0)
> | ^~~~~~~~~~~~
> ../lib/eal/arm/include/rte_pause_64.h:156:9: note: in expansion of macro
> ‘RTE_BUILD_BUG_ON’
> 156 | RTE_BUILD_BUG_ON(memorder != rte_memory_order_acquire &&
> | ^~~~~~~~~~~~~~~~
>
> This has been the case since the switch to C11 assert (537caad2). Fix the
> compile errors by replacing the check with an RTE_ASSERT.
>
> Signed-off-by: Daniel Gregory <daniel.gregory@bytedance.com>
Acked-by: Wathsala Vithanage <wathsala.vithanage@arm.com>
prev parent reply other threads:[~2024-05-11 16:49 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-02 14:21 Daniel Gregory
2024-05-02 16:20 ` Stephen Hemminger
2024-05-02 17:44 ` Daniel Gregory
2024-05-02 18:27 ` Stephen Hemminger
2024-05-02 21:48 ` Stephen Hemminger
2024-05-03 9:46 ` Daniel Gregory
2024-05-04 0:56 ` Stephen Hemminger
2024-05-09 11:02 ` Daniel Gregory
2024-05-03 13:32 ` David Marchand
2024-05-03 14:21 ` Daniel Gregory
2024-05-03 18:27 ` [PATCH v2] " Daniel Gregory
2024-05-03 18:30 ` Daniel Gregory
2024-05-04 0:59 ` Stephen Hemminger
2024-05-06 9:30 ` Ruifeng Wang
2024-05-11 17:00 ` Wathsala Wathawana Vithanage
2024-05-04 1:02 ` [PATCH] " Stephen Hemminger
2024-05-09 11:11 ` Daniel Gregory
2024-05-09 16:47 ` Tyler Retzlaff
2024-05-11 16:48 ` Wathsala Wathawana Vithanage [this message]
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