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Peter Anvin" , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt Subject: [PATCH 1/2] x86/percpu: Fix "multiple identical address spaces specified for type" clang warning Date: Sun, 26 May 2024 19:55:52 +0200 Message-ID: <20240526175655.227798-1-ubizjak@gmail.com> X-Mailer: git-send-email 2.42.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The clang build with named address spaces enabled currently fails with: error: multiple identical address spaces specified for type [-Werror,-Wduplicate-decl-specifier] The warning is emitted when accessing const_pcpu_hot structure, which is already declared in __seg_gs named address space. Use specialized accessor for __raw_cpu_read_const() instead, avoiding redeclaring __seg_gs named address space via __raw_cpu_read(). Signed-off-by: Uros Bizjak Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: "H. Peter Anvin" Cc: Nathan Chancellor Cc: Nick Desaulniers Cc: Bill Wendling Cc: Justin Stitt --- arch/x86/include/asm/percpu.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h index c55a79d5feae..aeea5c8a17de 100644 --- a/arch/x86/include/asm/percpu.h +++ b/arch/x86/include/asm/percpu.h @@ -160,7 +160,10 @@ do { \ *(qual __my_cpu_type(pcp) *)__my_cpu_ptr(&(pcp)) = (val); \ } while (0) -#define __raw_cpu_read_const(pcp) __raw_cpu_read(, , pcp) +#define __raw_cpu_read_const(pcp) \ +({ \ + *(typeof(pcp) *)(__force uintptr_t)(&(pcp)); \ +}) #else /* !CONFIG_USE_X86_SEG_SUPPORT: */ -- 2.42.0