From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-x241.google.com (mail-qt0-x241.google.com [IPv6:2607:f8b0:400d:c0d::241]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 409QFY2znyzF29V for ; Tue, 27 Mar 2018 20:09:53 +1100 (AEDT) Received: by mail-qt0-x241.google.com with SMTP id g5so11822609qth.7 for ; Tue, 27 Mar 2018 02:09:53 -0700 (PDT) Sender: Ram Pai From: Ram Pai To: mpe@ellerman.id.au, mingo@redhat.com, akpm@linux-foundation.org Cc: linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, x86@kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, dave.hansen@intel.com, benh@kernel.crashing.org, paulus@samba.org, khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com, hbabu@us.ibm.com, mhocko@kernel.org, bauerman@linux.vnet.ibm.com, ebiederm@xmission.com, linuxram@us.ibm.com, corbet@lwn.net, arnd@arndb.de Subject: [PATCH v13 2/3] mm, powerpc, x86: introduce an additional vma bit for powerpc pkey Date: Tue, 27 Mar 2018 02:09:27 -0700 Message-Id: <1522141768-25485-3-git-send-email-linuxram@us.ibm.com> In-Reply-To: <1522141768-25485-1-git-send-email-linuxram@us.ibm.com> References: <1522141768-25485-1-git-send-email-linuxram@us.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Currently only 4bits are allocated in the vma flags to hold 16 keys. This is sufficient for x86. PowerPC supports 32 keys, which needs 5bits. This patch allocates an additional bit. cc: Dave Hansen cc: Michael Ellermen cc: Benjamin Herrenschmidt cc: Andrew Morton Reviewed-by: Ingo Molnar Acked-by: Balbir Singh Signed-off-by: Ram Pai --- fs/proc/task_mmu.c | 1 + include/linux/mm.h | 3 ++- 2 files changed, 3 insertions(+), 1 deletions(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 6b996d0..6d83bb7 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -685,6 +685,7 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) [ilog2(VM_PKEY_BIT1)] = "", [ilog2(VM_PKEY_BIT2)] = "", [ilog2(VM_PKEY_BIT3)] = "", + [ilog2(VM_PKEY_BIT4)] = "", #endif /* CONFIG_ARCH_HAS_PKEYS */ }; size_t i; diff --git a/include/linux/mm.h b/include/linux/mm.h index ad207ad..d534f46 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -231,9 +231,10 @@ extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *, #ifdef CONFIG_ARCH_HAS_PKEYS # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0 # define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */ -# define VM_PKEY_BIT1 VM_HIGH_ARCH_1 +# define VM_PKEY_BIT1 VM_HIGH_ARCH_1 /* on x86 and 5-bit value on ppc64 */ # define VM_PKEY_BIT2 VM_HIGH_ARCH_2 # define VM_PKEY_BIT3 VM_HIGH_ARCH_3 +# define VM_PKEY_BIT4 VM_HIGH_ARCH_4 #endif /* CONFIG_ARCH_HAS_PKEYS */ #if defined(CONFIG_X86) -- 1.7.1