linux-kernel - [patch 19/38] x86/module: Provide __module

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Date:   Sun, 17 Jul 2022 01:17:40 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Linus Torvalds <torvalds@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Andrew Cooper <Andrew.Cooper3@...rix.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Johannes Wikner <kwikner@...z.ch>,
        Alyssa Milburn <alyssa.milburn@...ux.intel.com>,
        Jann Horn <jannh@...gle.com>, "H.J. Lu" <hjl.tools@...il.com>,
        Joao Moreira <joao.moreira@...el.com>,
        Joseph Nuzman <joseph.nuzman@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: [patch 19/38] x86/module: Provide __module_alloc()

Provide a function to allocate from module space with large TLBs. This is
required for callthunks as otherwise the ITLB pressure kills performance.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/include/asm/module.h |    2 ++
 arch/x86/mm/module_alloc.c    |   10 ++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

--- a/arch/x86/include/asm/module.h
+++ b/arch/x86/include/asm/module.h
@@ -13,4 +13,6 @@ struct mod_arch_specific {
 #endif
 };
 
+extern void *__module_alloc(unsigned long size, unsigned long vmflags);
+
 #endif /* _ASM_X86_MODULE_H */
--- a/arch/x86/mm/module_alloc.c
+++ b/arch/x86/mm/module_alloc.c
@@ -39,7 +39,7 @@ static unsigned long int get_module_load
 }
 #endif
 
-void *module_alloc(unsigned long size)
+void *__module_alloc(unsigned long size, unsigned long vmflags)
 {
 	gfp_t gfp_mask = GFP_KERNEL;
 	void *p;
@@ -47,10 +47,11 @@ void *module_alloc(unsigned long size)
 	if (PAGE_ALIGN(size) > MODULES_LEN)
 		return NULL;
 
+	vmflags |= VM_FLUSH_RESET_PERMS | VM_DEFER_KMEMLEAK;
 	p = __vmalloc_node_range(size, MODULE_ALIGN,
 				 MODULES_VADDR + get_module_load_offset(),
 				 MODULES_END, gfp_mask, PAGE_KERNEL,
-				 VM_FLUSH_RESET_PERMS | VM_DEFER_KMEMLEAK,
+				 vmflags,
 				 NUMA_NO_NODE, __builtin_return_address(0));
 
 	if (p && (kasan_alloc_module_shadow(p, size, gfp_mask) < 0)) {
@@ -60,3 +61,8 @@ void *module_alloc(unsigned long size)
 
 	return p;
 }
+
+void *module_alloc(unsigned long size)
+{
+	return __module_alloc(size, 0);
+}