linux-kernel - [tip: timers/vdso] x86/percpu: Make CONFIG_USE_X86_SEG

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Message-ID: <176874844148.510.15534678654047778598.tip-bot2@tip-bot2>
Date: Sun, 18 Jan 2026 15:00:41 -0000
From: "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: kernel test robot <lkp@...el.com>, Thomas Gleixner <tglx@...nel.org>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: timers/vdso] x86/percpu: Make CONFIG_USE_X86_SEG_SUPPORT work
 with sparse

The following commit has been merged into the timers/vdso branch of tip:

Commit-ID:     bbef8e2c29c32f048fac8e07f884f827d028f1da
Gitweb:        https://git.kernel.org/tip/bbef8e2c29c32f048fac8e07f884f827d028f1da
Author:        Thomas Gleixner <tglx@...nel.org>
AuthorDate:    Sun, 18 Jan 2026 15:45:40 +01:00
Committer:     Thomas Gleixner <tglx@...nel.org>
CommitterDate: Sun, 18 Jan 2026 15:54:17 +01:00

x86/percpu: Make CONFIG_USE_X86_SEG_SUPPORT work with sparse

Now that sparse builds enforce the usage of typeof_unqual() the casts in
__raw_cpu_read/write() cause sparse to emit tons of false postive
warnings:

 warning: cast removes address space '__percpu' of expression

Address this by annotating the casts with __force.

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Thomas Gleixner <tglx@...nel.org>
Link: https://patch.msgid.link/87v7gz0yjv.ffs@tglx
Closes: https://lore.kernel.org/oe-kbuild-all/202601181733.YZOf9XU3-lkp@intel.com/
---
 arch/x86/include/asm/percpu.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 725d0ef..c55058f 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -137,12 +137,12 @@
 
 #define __raw_cpu_read(size, qual, pcp)					\
 ({									\
-	*(qual __my_cpu_type(pcp) *)__my_cpu_ptr(&(pcp));		\
+	*(qual __my_cpu_type(pcp) * __force)__my_cpu_ptr(&(pcp));	\
 })
 
-#define __raw_cpu_write(size, qual, pcp, val)				\
-do {									\
-	*(qual __my_cpu_type(pcp) *)__my_cpu_ptr(&(pcp)) = (val);	\
+#define __raw_cpu_write(size, qual, pcp, val)					\
+do {										\
+	*(qual __my_cpu_type(pcp) * __force)__my_cpu_ptr(&(pcp)) = (val);	\
 } while (0)
 
 #define __raw_cpu_read_const(pcp)	__raw_cpu_read(, , pcp)