linux-kernel - [PATCH -tip v2 1/3] x86/percpu: Define PER_CPU_VAR macro also for !__ASSEMBLY_

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Message-ID: <20231105213731.1878100-2-ubizjak@gmail.com>
Date:   Sun,  5 Nov 2023 22:34:35 +0100
From:   Uros Bizjak <ubizjak@...il.com>
To:     x86@...nel.org, linux-kernel@...r.kernel.org
Cc:     Uros Bizjak <ubizjak@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH -tip v2 1/3] x86/percpu: Define PER_CPU_VAR macro also for !__ASSEMBLY__

Some C source files define 'asm' statements that use PER_CPU_VAR,
so make PER_CPU_VAR macro available also without __ASSEMBLY__.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Uros Bizjak <ubizjak@...il.com>
---
v2: Make PER_CPU_VAR macro available in 'asm' statements
    instead of moving 'asm' statements to *.S assembly files.
---
 arch/x86/include/asm/percpu.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index b86b27d15e52..0f12b2004b94 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -84,10 +84,15 @@
 })
 #endif /* CONFIG_USE_X86_SEG_SUPPORT */
 
+#define PER_CPU_VAR(var)	%__percpu_seg:(var)__percpu_rel
+
 #else /* CONFIG_SMP */
 #define __percpu_seg_override
 #define __percpu_prefix		""
 #define __force_percpu_prefix	""
+
+#define PER_CPU_VAR(var)	(var)__percpu_rel
+
 #endif /* CONFIG_SMP */
 
 #define __my_cpu_type(var)	typeof(var) __percpu_seg_override
-- 
2.41.0