linux-kernel - [PATCH v2 09/14] mips: Handle KCOV _

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Message-Id: <20250523043935.2009972-9-kees@kernel.org>
Date: Thu, 22 May 2025 21:39:19 -0700
From: Kees Cook <kees@...nel.org>
To: Arnd Bergmann <arnd@...db.de>
Cc: Kees Cook <kees@...nel.org>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	linux-mips@...r.kernel.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,
	linux-doc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	linux-riscv@...ts.infradead.org,
	linux-s390@...r.kernel.org,
	linux-efi@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	linux-kbuild@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	sparclinux@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: [PATCH v2 09/14] mips: 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
mips this requires forcing a function to be inline with __always_inline.

Signed-off-by: Kees Cook <kees@...nel.org>
---
Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: <linux-mips@...r.kernel.org>
---
 arch/mips/include/asm/time.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/include/asm/time.h b/arch/mips/include/asm/time.h
index e855a3611d92..044cff0e0764 100644
--- a/arch/mips/include/asm/time.h
+++ b/arch/mips/include/asm/time.h
@@ -55,7 +55,7 @@ static inline int mips_clockevent_init(void)
  */
 extern int init_r4k_clocksource(void);
 
-static inline int init_mips_clocksource(void)
+static __always_inline int init_mips_clocksource(void)
 {
 #ifdef CONFIG_CSRC_R4K
 	return init_r4k_clocksource();
-- 
2.34.1