linux-kernel - [RFC 3/3] x86/module: Use VM_GROUP

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Date:   Mon,  5 Apr 2021 13:37:11 -0700
From:   Rick Edgecombe <rick.p.edgecombe@...el.com>
To:     akpm@...ux-foundation.org, linux-mm@...ck.org, bpf@...r.kernel.org,
        dave.hansen@...ux.intel.com, peterz@...radead.org, luto@...nel.org,
        jeyu@...nel.org
Cc:     linux-kernel@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, hch@...radead.org, x86@...nel.org,
        Rick Edgecombe <rick.p.edgecombe@...el.com>
Subject: [RFC 3/3] x86/module: Use VM_GROUP_PAGES flag

Callers of module_alloc() will set permissions on the allocation. Use
the VM_GROUP_PAGES to reduce direct map breakage.

Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
---
 arch/x86/kernel/module.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
index 34b153cbd4ac..9161ce0e987f 100644
--- a/arch/x86/kernel/module.c
+++ b/arch/x86/kernel/module.c
@@ -75,7 +75,7 @@ void *module_alloc(unsigned long size)
 	p = __vmalloc_node_range(size, MODULE_ALIGN,
 				    MODULES_VADDR + get_module_load_offset(),
 				    MODULES_END, GFP_KERNEL,
-				    PAGE_KERNEL, 0, NUMA_NO_NODE,
+				    PAGE_KERNEL, VM_GROUP_PAGES, NUMA_NO_NODE,
 				    __builtin_return_address(0));
 	if (p && (kasan_module_alloc(p, size) < 0)) {
 		vfree(p);
-- 
2.29.2