[PATCH v2 2/3] arm64: Support huge vmalloc mappings

From: Kefeng Wang <wangkefeng.wang@huawei.com>
To: Jonathan Corbet <corbet@lwn.net>,
	Andrew Morton <akpm@linux-foundation.org>,
	<linuxppc-dev@lists.ozlabs.org>, <linux-doc@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <linux-mm@kvack.org>,
	<x86@kernel.org>, <linux-arm-kernel@lists.infradead.org>
Cc: Nicholas Piggin <npiggin@gmail.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Christophe Leroy <christophe.leroy@csgroup.eu>,
	Matthew Wilcox <willy@infradead.org>,
	Kefeng Wang <wangkefeng.wang@huawei.com>
Subject: [PATCH v2 2/3] arm64: Support huge vmalloc mappings
Date: Mon, 27 Dec 2021 22:59:02 +0800	[thread overview]
Message-ID: <20211227145903.187152-3-wangkefeng.wang@huawei.com> (raw)
In-Reply-To: <20211227145903.187152-1-wangkefeng.wang@huawei.com>

This patch select HAVE_ARCH_HUGE_VMALLOC to let arm64 support huge
vmalloc mappings.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
 Documentation/admin-guide/kernel-parameters.txt | 4 ++--
 arch/arm64/Kconfig                              | 1 +
 arch/arm64/kernel/module.c                      | 5 +++--
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 7b2f900fd243..e3f9fd7ec106 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1639,7 +1639,7 @@
 			precedence over memory_hotplug.memmap_on_memory.
 
 
-	hugevmalloc=	[PPC] Reguires CONFIG_HAVE_ARCH_HUGE_VMALLOC
+	hugevmalloc=	[KNL,PPC,ARM64] Reguires CONFIG_HAVE_ARCH_HUGE_VMALLOC
 			Format: { on | off }
 			Default set by CONFIG_HUGE_VMALLOC_DEFAULT_ENABLED.
 
@@ -3424,7 +3424,7 @@
 
 	nohugeiomap	[KNL,X86,PPC,ARM64] Disable kernel huge I/O mappings.
 
-	nohugevmalloc	[PPC] Disable kernel huge vmalloc mappings.
+	nohugevmalloc	[KNL,PPC,ARM64] Disable kernel huge vmalloc mappings.
 
 	nosmt		[KNL,S390] Disable symmetric multithreading (SMT).
 			Equivalent to smt=1.
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 3bb0b67292b5..c34bbb4482b0 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -142,6 +142,7 @@ config ARM64
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_ARCH_BITREVERSE
 	select HAVE_ARCH_COMPILER_H
+	select HAVE_ARCH_HUGE_VMALLOC
 	select HAVE_ARCH_HUGE_VMAP
 	select HAVE_ARCH_JUMP_LABEL
 	select HAVE_ARCH_JUMP_LABEL_RELATIVE
diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c
index 309a27553c87..af7b4cbace2b 100644
--- a/arch/arm64/kernel/module.c
+++ b/arch/arm64/kernel/module.c
@@ -36,7 +36,8 @@ void *module_alloc(unsigned long size)
 		module_alloc_end = MODULES_END;
 
 	p = __vmalloc_node_range(size, MODULE_ALIGN, module_alloc_base,
-				module_alloc_end, gfp_mask, PAGE_KERNEL, VM_DEFER_KMEMLEAK,
+				module_alloc_end, gfp_mask, PAGE_KERNEL,
+				VM_DEFER_KMEMLEAK | VM_NO_HUGE_VMAP,
 				NUMA_NO_NODE, __builtin_return_address(0));
 
 	if (!p && IS_ENABLED(CONFIG_ARM64_MODULE_PLTS) &&
@@ -55,7 +56,7 @@ void *module_alloc(unsigned long size)
 		 */
 		p = __vmalloc_node_range(size, MODULE_ALIGN, module_alloc_base,
 				module_alloc_base + SZ_2G, GFP_KERNEL,
-				PAGE_KERNEL, 0, NUMA_NO_NODE,
+				PAGE_KERNEL, VM_NO_HUGE_VMAP, NUMA_NO_NODE,
 				__builtin_return_address(0));
 
 	if (p && (kasan_module_alloc(p, size, gfp_mask) < 0)) {
-- 
2.26.2

