From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ley Foon Tan Subject: [PATCH v3 01/29] asm-generic: add generic futex for !CONFIG_SMP Date: Mon, 8 Sep 2014 17:22:12 +0800 Message-ID: <1410168160-3624-2-git-send-email-lftan@altera.com> References: <1410168160-3624-1-git-send-email-lftan@altera.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from mail-bn1bon0099.outbound.protection.outlook.com ([157.56.111.99]:23072 "EHLO na01-bn1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753326AbaIHJhb (ORCPT ); Mon, 8 Sep 2014 05:37:31 -0400 In-Reply-To: <1410168160-3624-1-git-send-email-lftan@altera.com> Sender: linux-arch-owner@vger.kernel.org List-ID: To: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Cc: Ley Foon Tan , lftan.linux@gmail.com, cltang@codesourcery.com Follow m68k futex implementation for !CONFIG_SMP. Signed-off-by: Ley Foon Tan --- include/asm-generic/futex.h | 82 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) diff --git a/include/asm-generic/futex.h b/include/asm-generic/futex.h index 01f227e..f5650a5 100644 --- a/include/asm-generic/futex.h +++ b/include/asm-generic/futex.h @@ -5,6 +5,87 @@ #include #include +#ifndef CONFIG_SMP +static inline int +futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr) +{ + int op = (encoded_op >> 28) & 7; + int cmp = (encoded_op >> 24) & 15; + int oparg = (encoded_op << 8) >> 20; + int cmparg = (encoded_op << 20) >> 20; + int oldval, ret; + u32 tmp; + + if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) + oparg = 1 << oparg; + + pagefault_disable(); /* implies preempt_disable() */ + + ret = -EFAULT; + if (unlikely(get_user(oldval, uaddr) != 0)) + goto out_pagefault_enable; + + ret = 0; + tmp = oldval; + + switch (op) { + case FUTEX_OP_SET: + tmp = oparg; + break; + case FUTEX_OP_ADD: + tmp += oparg; + break; + case FUTEX_OP_OR: + tmp |= oparg; + break; + case FUTEX_OP_ANDN: + tmp &= ~oparg; + break; + case FUTEX_OP_XOR: + tmp ^= oparg; + break; + default: + ret = -ENOSYS; + } + + if (ret == 0 && unlikely(put_user(tmp, uaddr) != 0)) + ret = -EFAULT; + +out_pagefault_enable: + pagefault_enable(); /* subsumes preempt_enable() */ + + if (ret == 0) { + switch (cmp) { + case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; + case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; + case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; + case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; + case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; + case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; + default: ret = -ENOSYS; + } + } + return ret; +} + +static inline int +futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, + u32 oldval, u32 newval) +{ + u32 val; + + if (unlikely(get_user(val, uaddr) != 0)) + return -EFAULT; + + if (val == oldval && unlikely(put_user(newval, uaddr) != 0)) + return -EFAULT; + + *uval = val; + + return 0; +} + +#else static inline int futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr) { @@ -54,4 +135,5 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, return -ENOSYS; } +#endif /* CONFIG_SMP */ #endif -- 1.8.2.1