linux-kernel - [PATCH] arm64: remove unneeded BUILD_BUG

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Date: Fri,  2 Feb 2024 12:02:11 +0800
From: Dawei Li <dawei.li@...ngroup.cn>
To: catalin.marinas@....com,
	will@...nel.org
Cc: mark.rutland@....com,
	mcgrof@...nel.org,
	jpoimboe@...nel.org,
	j.granados@...sung.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	set_pte_at@...look.com,
	Dawei Li <dawei.li@...ngroup.cn>
Subject: [PATCH] arm64: remove unneeded BUILD_BUG_ON assertion

Since commit c02433dd6de3 ("arm64: split thread_info from task stack"),
CONFIG_THREAD_INFO_IN_TASK is enabled unconditionally for arm64. So
remove this always-true assertion from arch_dup_task_struct.

Signed-off-by: Dawei Li <dawei.li@...ngroup.cn>
---
 arch/arm64/kernel/process.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 7387b68c745b..4ae31b7af6c3 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -290,9 +290,6 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 		fpsimd_preserve_current_state();
 	*dst = *src;
 
-	/* We rely on the above assignment to initialize dst's thread_flags: */
-	BUILD_BUG_ON(!IS_ENABLED(CONFIG_THREAD_INFO_IN_TASK));
-
 	/*
 	 * Detach src's sve_state (if any) from dst so that it does not
 	 * get erroneously used or freed prematurely.  dst's copies
-- 
2.27.0