From: Stephen Hemminger <stephen@networkplumber.org>
To: Daniel Gregory <daniel.gregory@bytedance.com>
Cc: Ruifeng Wang <ruifeng.wang@arm.com>,
dev@dpdk.org, Punit Agrawal <punit.agrawal@bytedance.com>,
Liang Ma <liangma@bytedance.com>
Subject: Re: [PATCH] eal/arm: replace RTE_BUILD_BUG on non-constant
Date: Thu, 2 May 2024 09:20:45 -0700 [thread overview]
Message-ID: <20240502092045.02a426fe@hermes.local> (raw)
In-Reply-To: <20240502142116.63760-1-daniel.gregory@bytedance.com>
On Thu, 2 May 2024 15:21:16 +0100
Daniel Gregory <daniel.gregory@bytedance.com> wrote:
> 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.
>
> ../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>
The memory order passed to those routines must be constant.
Why not:
diff --git a/lib/eal/arm/include/rte_pause_64.h b/lib/eal/arm/include/rte_pause_64.h
index 5cb8b59056..81987de771 100644
--- a/lib/eal/arm/include/rte_pause_64.h
+++ b/lib/eal/arm/include/rte_pause_64.h
@@ -172,6 +172,8 @@ rte_wait_until_equal_32(volatile uint32_t *addr, uint32_t expected,
{
uint32_t value;
+ static_assert(__builtin_constant_p(memorder), "memory order is not a constant");
+
RTE_BUILD_BUG_ON(memorder != rte_memory_order_acquire &&
memorder != rte_memory_order_relaxed);
@@ -191,6 +193,8 @@ rte_wait_until_equal_64(volatile uint64_t *addr, uint64_t expected,
{
uint64_t value;
+ static_assert(__builtin_constant_p(memorder), "memory order is not a constant");
+
RTE_BUILD_BUG_ON(memorder != rte_memory_order_acquire &&
memorder != rte_memory_order_relaxed);
next prev parent reply other threads:[~2024-05-02 16:21 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 [this message]
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
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