From patchwork Mon Sep 2 12:04:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe Leroy X-Patchwork-Id: 825116 Received: from pegase2.c-s.fr (pegase2.c-s.fr [93.17.235.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AB55520013A; Mon, 2 Sep 2024 12:04:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=93.17.235.10 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725278694; cv=none; b=fznc0peN3bmsuoctunoKTsh/dHnTDRXmCWEp6Rsd2yHBomec/J0YLAR6qT0qbGRbPH6mLSLt+hp5+VW6z7KW7lM6WKlLPISeX1TzjaIShDexxV2QibnKLm4/ocrEmZFa4IkZ6ZsX5vY93UXTVu5HwgjnMfCf2JNynuH46nsoGJk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725278694; c=relaxed/simple; bh=D2XQkJzjCFhHvddcGK1wPF6zrU/7AFSP1S12xB5e/Jg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=r5RhHbrntPQTGdhDwuLX2P5mvj11rHNpOH+uLBXVVV7WbpM5Z22UOPJ9qycJTnOI0LsoDQmPZydd411CyBdpzx27wgZlHZoJCvKWwbhBKFRfVt1Kn2wId64RsfTT9zckHJcPeLTnSXrUbhuNofz2Zmjuqq16FspvfrzUjiFApo0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=csgroup.eu; spf=pass smtp.mailfrom=csgroup.eu; arc=none smtp.client-ip=93.17.235.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=csgroup.eu Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=csgroup.eu Received: from localhost (mailhub3.si.c-s.fr [172.26.127.67]) by localhost (Postfix) with ESMTP id 4Wy6rG42qvz9sSS; Mon, 2 Sep 2024 14:04:46 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from pegase2.c-s.fr ([172.26.127.65]) by localhost (pegase2.c-s.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pr5VjX4xW_4R; Mon, 2 Sep 2024 14:04:46 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase2.c-s.fr (Postfix) with ESMTP id 4Wy6rG2hzbz9sS7; Mon, 2 Sep 2024 14:04:46 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 47D6D8B763; Mon, 2 Sep 2024 14:04:46 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id 2QYRZDFL4LQE; Mon, 2 Sep 2024 14:04:46 +0200 (CEST) Received: from PO20335.idsi0.si.c-s.fr (unknown [192.168.234.167]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 4B7AA8B76C; Mon, 2 Sep 2024 14:04:45 +0200 (CEST) From: Christophe Leroy To: Andrew Morton , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Michael Ellerman , Nicholas Piggin , Naveen N Rao , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Shuah Khan , "Jason A . Donenfeld" Cc: Christophe Leroy , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kselftest@vger.kernel.org, llvm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, Adhemerval Zanella , Xi Ruoyao Subject: [PATCH v4 1/5] mm: Define VM_DROPPABLE for powerpc/32 Date: Mon, 2 Sep 2024 14:04:38 +0200 Message-ID: <2f3d000794fb8ba269ecd99255ce0974ec29b144.1725278148.git.christophe.leroy@csgroup.eu> X-Mailer: git-send-email 2.44.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1725278679; l=3068; i=christophe.leroy@csgroup.eu; s=20211009; h=from:subject:message-id; bh=D2XQkJzjCFhHvddcGK1wPF6zrU/7AFSP1S12xB5e/Jg=; b=862t58a+UUHiRkFB3MVUl14yhG8isNoHEs0EJ66BJ+LHhxCT4V3V+QaMlGWamNO6JfHeMVozB Dy/b2iEUtK7Ck4sOycw9b9DCn0OGzlgVPGtesvTWdR7Q19bQL61MaT1 X-Developer-Key: i=christophe.leroy@csgroup.eu; a=ed25519; pk=HIzTzUj91asvincQGOFx6+ZF5AoUuP9GdOtQChs7Mm0= Commit 9651fcedf7b9 ("mm: add MAP_DROPPABLE for designating always lazily freeable mappings") only adds VM_DROPPABLE for 64 bits architectures. In order to also use the getrandom vDSO implementation on powerpc/32, use VM_ARCH_1 for VM_DROPPABLE on powerpc/32. This is possible because VM_ARCH_1 is used for VM_SAO on powerpc and VM_SAO is only for powerpc/64. It is used in combination with PROT_SAO in some parts of code that are restricted to CONFIG_PPC64 through #ifdefs, it is therefore possible to define VM_SAO for CONFIG_PPC64 only. Signed-off-by: Christophe Leroy --- v4: Added more details in commit message following comment from Michael. v3: Fixed build failure reported by robots. --- fs/proc/task_mmu.c | 4 +++- include/linux/mm.h | 4 +++- include/trace/events/mmflags.h | 4 ++-- 3 files changed, 8 insertions(+), 4 deletions(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 5f171ad7b436..3a07e13e2f81 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -987,8 +987,10 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) #ifdef CONFIG_X86_USER_SHADOW_STACK [ilog2(VM_SHADOW_STACK)] = "ss", #endif -#ifdef CONFIG_64BIT +#if defined(CONFIG_64BIT) || defined(CONFIG_PPC32) [ilog2(VM_DROPPABLE)] = "dp", +#endif +#ifdef CONFIG_64BIT [ilog2(VM_SEALED)] = "sl", #endif }; diff --git a/include/linux/mm.h b/include/linux/mm.h index 6549d0979b28..028847f39442 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -359,7 +359,7 @@ extern unsigned int kobjsize(const void *objp); #if defined(CONFIG_X86) # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ -#elif defined(CONFIG_PPC) +#elif defined(CONFIG_PPC64) # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */ #elif defined(CONFIG_PARISC) # define VM_GROWSUP VM_ARCH_1 @@ -409,6 +409,8 @@ extern unsigned int kobjsize(const void *objp); #ifdef CONFIG_64BIT #define VM_DROPPABLE_BIT 40 #define VM_DROPPABLE BIT(VM_DROPPABLE_BIT) +#elif defined(CONFIG_PPC32) +#define VM_DROPPABLE VM_ARCH_1 #else #define VM_DROPPABLE VM_NONE #endif diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h index b63d211bd141..37265977d524 100644 --- a/include/trace/events/mmflags.h +++ b/include/trace/events/mmflags.h @@ -143,7 +143,7 @@ IF_HAVE_PG_ARCH_X(arch_3) #if defined(CONFIG_X86) #define __VM_ARCH_SPECIFIC_1 {VM_PAT, "pat" } -#elif defined(CONFIG_PPC) +#elif defined(CONFIG_PPC64) #define __VM_ARCH_SPECIFIC_1 {VM_SAO, "sao" } #elif defined(CONFIG_PARISC) #define __VM_ARCH_SPECIFIC_1 {VM_GROWSUP, "growsup" } @@ -165,7 +165,7 @@ IF_HAVE_PG_ARCH_X(arch_3) # define IF_HAVE_UFFD_MINOR(flag, name) #endif -#ifdef CONFIG_64BIT +#if defined(CONFIG_64BIT) || defined(CONFIG_PPC32) # define IF_HAVE_VM_DROPPABLE(flag, name) {flag, name}, #else # define IF_HAVE_VM_DROPPABLE(flag, name)