linux-hardening - [PATCH v2 06/14] arm64: Handle KCOV _

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Message-Id: <20250523043935.2009972-6-kees@kernel.org>
Date: Thu, 22 May 2025 21:39:16 -0700
From: Kees Cook <kees@...nel.org>
To: Arnd Bergmann <arnd@...db.de>
Cc: Kees Cook <kees@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Gavin Shan <gshan@...hat.com>,
	"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
	James Morse <james.morse@....com>,
	Oza Pawandeep <quic_poza@...cinc.com>,
	Anshuman Khandual <anshuman.khandual@....com>,
	linux-arm-kernel@...ts.infradead.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Christoph Hellwig <hch@....de>,
	Marco Elver <elver@...gle.com>,
	Andrey Konovalov <andreyknvl@...il.com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas.schier@...ux.dev>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	linux-kernel@...r.kernel.org,
	x86@...nel.org,
	kasan-dev@...glegroups.com,
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	linux-riscv@...ts.infradead.org,
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Subject: [PATCH v2 06/14] arm64: Handle KCOV __init vs inline mismatches

When KCOV is enabled all functions get instrumented, unless
the __no_sanitize_coverage attribute is used. To prepare for
__no_sanitize_coverage being applied to __init functions, we
have to handle differences in how GCC's inline optimizations get
resolved. For arm64 this requires forcing one function to be inline
with __always_inline.

Signed-off-by: Kees Cook <kees@...nel.org>
---
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Gavin Shan <gshan@...hat.com>
Cc: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Cc: James Morse <james.morse@....com>
Cc: Oza Pawandeep <quic_poza@...cinc.com>
Cc: Anshuman Khandual <anshuman.khandual@....com>
Cc: <linux-arm-kernel@...ts.infradead.org>
---
 arch/arm64/include/asm/acpi.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
index a407f9cd549e..c07a58b96329 100644
--- a/arch/arm64/include/asm/acpi.h
+++ b/arch/arm64/include/asm/acpi.h
@@ -150,7 +150,7 @@ acpi_set_mailbox_entry(int cpu, struct acpi_madt_generic_interrupt *processor)
 {}
 #endif
 
-static inline const char *acpi_get_enable_method(int cpu)
+static __always_inline const char *acpi_get_enable_method(int cpu)
 {
 	if (acpi_psci_present())
 		return "psci";
-- 
2.34.1