linux-kernel - [PATCH 3/3] x86: Support huge vmalloc mappings

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Date:   Sun, 26 Dec 2021 16:39:12 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        <x86@...nel.org>, <linux-arm-kernel@...ts.infradead.org>
CC:     Nicholas Piggin <npiggin@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        "Benjamin Herrenschmidt" <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH 3/3] x86: Support huge vmalloc mappings

This patch select HAVE_ARCH_HUGE_VMALLOC to let X86_64 and X86_PAE
support huge vmalloc mappings, it is disabled by default, use
hugevmalloc=on to enable it.

Cc: Thomas Gleixner <tglx@...utronix.de> 
Cc: Ingo Molnar <mingo@...hat.com> 
Cc: Borislav Petkov <bp@...en8.de> 
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 Documentation/admin-guide/kernel-parameters.txt | 4 ++--
 arch/x86/Kconfig                                | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 235a23b08809..5c8780e66be2 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1630,7 +1630,7 @@
 			precedence over memory_hotplug.memmap_on_memory.
 
 
-	hugevmalloc=	[KNL,PPC,ARM64] Reguires CONFIG_HAVE_ARCH_HUGE_VMALLOC
+	hugevmalloc=	[KNL,PPC,ARM64,X86] Reguires CONFIG_HAVE_ARCH_HUGE_VMALLOC
 			Format: { on | off }
 			Default set by CONFIG_HUGE_VMALLOC_DEFAULT_ENABLED.
 
@@ -3415,7 +3415,7 @@
 
 	nohugeiomap	[KNL,X86,PPC,ARM64] Disable kernel huge I/O mappings.
 
-	nohugevmalloc	[KNL,PPC,ARM64] Disable kernel huge vmalloc mappings.
+	nohugevmalloc	[KNL,PPC,ARM64,X86] Disable kernel huge vmalloc mappings.
 
 	nosmt		[KNL,S390] Disable symmetric multithreading (SMT).
 			Equivalent to smt=1.
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5c2ccb85f2ef..31e465fecd01 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -157,6 +157,7 @@ config X86
 	select HAVE_ACPI_APEI_NMI		if ACPI
 	select HAVE_ALIGNED_STRUCT_PAGE		if SLUB
 	select HAVE_ARCH_AUDITSYSCALL
+	select HAVE_ARCH_HUGE_VMALLOC		if HAVE_ARCH_HUGE_VMAP
 	select HAVE_ARCH_HUGE_VMAP		if X86_64 || X86_PAE
 	select HAVE_ARCH_JUMP_LABEL
 	select HAVE_ARCH_JUMP_LABEL_RELATIVE
-- 
2.26.2