From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk0-f198.google.com (mail-qk0-f198.google.com [209.85.220.198]) by kanga.kvack.org (Postfix) with ESMTP id 3DAF2280396 for ; Fri, 4 Aug 2017 15:08:21 -0400 (EDT) Received: by mail-qk0-f198.google.com with SMTP id k14so12593416qkl.7 for ; Fri, 04 Aug 2017 12:08:21 -0700 (PDT) Received: from shelob.surriel.com (shelob.surriel.com. [96.67.55.147]) by mx.google.com with ESMTPS id a130si2120142qkg.282.2017.08.04.12.08.20 for (version=TLS1 cipher=AES128-SHA bits=128/128); Fri, 04 Aug 2017 12:08:20 -0700 (PDT) From: riel@redhat.com Subject: [PATCH 1/2] x86,mpx: make mpx depend on x86-64 to free up VMA flag Date: Fri, 4 Aug 2017 15:07:29 -0400 Message-Id: <20170804190730.17858-2-riel@redhat.com> In-Reply-To: <20170804190730.17858-1-riel@redhat.com> References: <20170804190730.17858-1-riel@redhat.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, fweimer@redhat.com, colm@allcosts.net, akpm@linux-foundation.org, rppt@linux.vnet.ibm.com, keescook@chromium.org, luto@amacapital.net, wad@chromium.org, mingo@kernel.org From: Rik van Riel MPX only seems to be available on 64 bit CPUs, starting with Skylake and Goldmont. Move VM_MPX into the 64 bit only portion of vma->vm_flags, in order to free up a VMA flag. Signed-off-by: Rik van Riel --- arch/x86/Kconfig | 4 +++- include/linux/mm.h | 8 ++++++-- 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 781521b7cf9e..6dff14fadc6f 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1756,7 +1756,9 @@ config X86_SMAP config X86_INTEL_MPX prompt "Intel MPX (Memory Protection Extensions)" def_bool n - depends on CPU_SUP_INTEL + # Note: only available in 64-bit mode due to VMA flags shortage + depends on CPU_SUP_INTEL && X86_64 + select ARCH_USES_HIGH_VMA_FLAGS ---help--- MPX provides hardware features that can be used in conjunction with compiler-instrumented code to check diff --git a/include/linux/mm.h b/include/linux/mm.h index 46b9ac5e8569..7550eeb06ccf 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -208,10 +208,12 @@ extern unsigned int kobjsize(const void *objp); #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */ #define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */ #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */ +#define VM_HIGH_ARCH_BIT_4 36 /* bit only usable on 64-bit architectures */ #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0) #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1) #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2) #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3) +#define VM_HIGH_ARCH_4 BIT(VM_HIGH_ARCH_BIT_4) #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */ #if defined(CONFIG_X86) @@ -235,9 +237,11 @@ extern unsigned int kobjsize(const void *objp); # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */ #endif -#if defined(CONFIG_X86) +#if defined(CONFIG_X86_INTEL_MPX) /* MPX specific bounds table or bounds directory */ -# define VM_MPX VM_ARCH_2 +# define VM_MPX VM_HIGH_ARCH_BIT_4 +#else +# define VM_MPX VM_NONE #endif #ifndef VM_GROWSUP -- 2.9.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org