linux-kernel - [RFC PATCH 01/16] kasan: mark kasan_(hw_)tags_enabled() __always

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Message-ID: <20250923174903.76283-2-ada.coupriediaz@arm.com>
Date: Tue, 23 Sep 2025 18:48:48 +0100
From: Ada Couprie Diaz <ada.coupriediaz@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Ard Biesheuvel <ardb@...nel.org>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Alexander Potapenko <glider@...gle.com>,
	Andrey Konovalov <andreyknvl@...il.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	linux-kernel@...r.kernel.org,
	kvmarm@...ts.linux.dev,
	kasan-dev@...glegroups.com,
	Mark Rutland <mark.rutland@....com>,
	Ada Couprie Diaz <ada.coupriediaz@....com>
Subject: [RFC PATCH 01/16] kasan: mark kasan_(hw_)tags_enabled() __always_inline

`kasan_hw_tags_enabled()` and `kasan_tags_enabled()` are marked inline,
except `kasan_enabled()` with `CONFIG_KASAN_HW_TAGS`,
which is marked `__always_inline`.

Those functions are called in the arm64 alternative callback
`kasan_hw_tags_enable()`, which requires them to be inlined to avoid
being instrumented and safe for patching.

For consistency between the four declarations and to make the arm64
alternative callback safe, mark them `__always_inline`.

Signed-off-by: Ada Couprie Diaz <ada.coupriediaz@....com>
---
 include/linux/kasan-enabled.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/kasan-enabled.h b/include/linux/kasan-enabled.h
index 6f612d69ea0c..d3d5a2327e11 100644
--- a/include/linux/kasan-enabled.h
+++ b/include/linux/kasan-enabled.h
@@ -13,19 +13,19 @@ static __always_inline bool kasan_enabled(void)
 	return static_branch_likely(&kasan_flag_enabled);
 }
 
-static inline bool kasan_hw_tags_enabled(void)
+static __always_inline bool kasan_hw_tags_enabled(void)
 {
 	return kasan_enabled();
 }
 
 #else /* CONFIG_KASAN_HW_TAGS */
 
-static inline bool kasan_enabled(void)
+static __always_inline bool kasan_enabled(void)
 {
 	return IS_ENABLED(CONFIG_KASAN);
 }
 
-static inline bool kasan_hw_tags_enabled(void)
+static __always_inline bool kasan_hw_tags_enabled(void)
 {
 	return false;
 }
-- 
2.43.0