Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753752AbdDJQlA (ORCPT ); Mon, 10 Apr 2017 12:41:00 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:34300 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752596AbdDJQk5 (ORCPT ); Mon, 10 Apr 2017 12:40:57 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Paul Burton , James Hogan , "Maciej W. Rozycki" , Ralf Baechle , Peter Zijlstra , Ingo Molnar , linux-mips@linux-mips.org Subject: [PATCH 4.4 29/32] MIPS: End spinlocks with .insn Date: Mon, 10 Apr 2017 18:39:19 +0200 Message-Id: <20170410163843.357764261@linuxfoundation.org> X-Mailer: git-send-email 2.12.2 In-Reply-To: <20170410163839.055472822@linuxfoundation.org> References: <20170410163839.055472822@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2716 Lines: 77 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Paul Burton commit 4b5347a24a0f2d3272032c120664b484478455de upstream. When building for microMIPS we need to ensure that the assembler always knows that there is code at the target of a branch or jump. Recent toolchains will fail to link a microMIPS kernel when this isn't the case due to what it thinks is a branch to non-microMIPS code. mips-mti-linux-gnu-ld kernel/built-in.o: .spinlock.text+0x2fc: Unsupported branch between ISA modes. mips-mti-linux-gnu-ld final link failed: Bad value This is due to inline assembly labels in spinlock.h not being followed by an instruction mnemonic, either due to a .subsection pseudo-op or the end of the inline asm block. Fix this with a .insn direction after such labels. Signed-off-by: Paul Burton Signed-off-by: James Hogan Reviewed-by: Maciej W. Rozycki Cc: Ralf Baechle Cc: Peter Zijlstra Cc: Ingo Molnar Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/15325/ Signed-off-by: James Hogan Signed-off-by: Greg Kroah-Hartman --- arch/mips/include/asm/spinlock.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/arch/mips/include/asm/spinlock.h +++ b/arch/mips/include/asm/spinlock.h @@ -112,7 +112,7 @@ static inline void arch_spin_lock(arch_s " andi %[ticket], %[ticket], 0xffff \n" " bne %[ticket], %[my_ticket], 4f \n" " subu %[ticket], %[my_ticket], %[ticket] \n" - "2: \n" + "2: .insn \n" " .subsection 2 \n" "4: andi %[ticket], %[ticket], 0xffff \n" " sll %[ticket], 5 \n" @@ -187,7 +187,7 @@ static inline unsigned int arch_spin_try " sc %[ticket], %[ticket_ptr] \n" " beqz %[ticket], 1b \n" " li %[ticket], 1 \n" - "2: \n" + "2: .insn \n" " .subsection 2 \n" "3: b 2b \n" " li %[ticket], 0 \n" @@ -367,7 +367,7 @@ static inline int arch_read_trylock(arch " .set reorder \n" __WEAK_LLSC_MB " li %2, 1 \n" - "2: \n" + "2: .insn \n" : "=" GCC_OFF_SMALL_ASM() (rw->lock), "=&r" (tmp), "=&r" (ret) : GCC_OFF_SMALL_ASM() (rw->lock) : "memory"); @@ -407,7 +407,7 @@ static inline int arch_write_trylock(arc " lui %1, 0x8000 \n" " sc %1, %0 \n" " li %2, 1 \n" - "2: \n" + "2: .insn \n" : "=" GCC_OFF_SMALL_ASM() (rw->lock), "=&r" (tmp), "=&r" (ret) : GCC_OFF_SMALL_ASM() (rw->lock)