linux-kernel - [PATCH v2 06/12] arch/loongarch: don't initialize kasan if it's disabled

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Message-ID: <20250812124941.69508-7-bhe@redhat.com>
Date: Tue, 12 Aug 2025 20:49:35 +0800
From: Baoquan He <bhe@...hat.com>
To: linux-mm@...ck.org
Cc: ryabinin.a.a@...il.com,
	glider@...gle.com,
	andreyknvl@...il.com,
	dvyukov@...gle.com,
	vincenzo.frascino@....com,
	akpm@...ux-foundation.org,
	kasan-dev@...glegroups.com,
	linux-kernel@...r.kernel.org,
	kexec@...ts.infradead.org,
	sj@...nel.org,
	lorenzo.stoakes@...cle.com,
	elver@...gle.com,
	snovitoll@...il.com,
	Baoquan He <bhe@...hat.com>
Subject: [PATCH v2 06/12] arch/loongarch: don't initialize kasan if it's disabled

And also add code to enable kasan_flag_enabled, this is for later
usage.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 arch/loongarch/mm/kasan_init.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/loongarch/mm/kasan_init.c b/arch/loongarch/mm/kasan_init.c
index d2681272d8f0..0c32eee6910f 100644
--- a/arch/loongarch/mm/kasan_init.c
+++ b/arch/loongarch/mm/kasan_init.c
@@ -267,6 +267,8 @@ void __init kasan_init(void)
 	u64 i;
 	phys_addr_t pa_start, pa_end;
 
+	if (kasan_arg_disabled)
+		return;
 	/*
 	 * If PGDIR_SIZE is too large for cpu_vabits, KASAN_SHADOW_END will
 	 * overflow UINTPTR_MAX and then looks like a user space address.
@@ -327,6 +329,9 @@ void __init kasan_init(void)
 	csr_write64(__pa_symbol(swapper_pg_dir), LOONGARCH_CSR_PGDH);
 	local_flush_tlb_all();
 
+	/* KASAN is now initialized, enable it. */
+	static_branch_enable(&kasan_flag_enabled);
+
 	/* At this point kasan is fully initialized. Enable error messages */
 	init_task.kasan_depth = 0;
 	pr_info("KernelAddressSanitizer initialized.\n");
-- 
2.41.0