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Message-ID: <20240411160051.2093261-5-rppt@kernel.org>
Date: Thu, 11 Apr 2024 19:00:40 +0300
From: Mike Rapoport <rppt@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Alexandre Ghiti <alexghiti@...osinc.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Björn Töpel <bjorn@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	"David S. Miller" <davem@...emloft.net>,
	Dinh Nguyen <dinguyen@...nel.org>,
	Donald Dutile <ddutile@...hat.com>,
	Eric Chanudet <echanude@...hat.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Helge Deller <deller@....de>,
	Huacai Chen <chenhuacai@...nel.org>,
	Kent Overstreet <kent.overstreet@...ux.dev>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Mike Rapoport <rppt@...nel.org>,
	Nadav Amit <nadav.amit@...il.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Puranjay Mohan <puranjay12@...il.com>,
	Rick Edgecombe <rick.p.edgecombe@...el.com>,
	Russell King <linux@...linux.org.uk>,
	Song Liu <song@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Will Deacon <will@...nel.org>,
	bpf@...r.kernel.org,
	linux-arch@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mips@...r.kernel.org,
	linux-mm@...ck.org,
	linux-modules@...r.kernel.org,
	linux-parisc@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-s390@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	loongarch@...ts.linux.dev,
	netdev@...r.kernel.org,
	sparclinux@...r.kernel.org,
	x86@...nel.org
Subject: [PATCH v4 04/15] module: make module_memory_{alloc,free} more self-contained

From: "Mike Rapoport (IBM)" <rppt@...nel.org>

Move the logic related to the memory allocation and freeing into
module_memory_alloc() and module_memory_free().

Signed-off-by: Mike Rapoport (IBM) <rppt@...nel.org>
---
 kernel/module/main.c | 64 +++++++++++++++++++++++++++-----------------
 1 file changed, 39 insertions(+), 25 deletions(-)

diff --git a/kernel/module/main.c b/kernel/module/main.c
index e1e8a7a9d6c1..5b82b069e0d3 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -1203,15 +1203,44 @@ static bool mod_mem_use_vmalloc(enum mod_mem_type type)
 		mod_mem_type_is_core_data(type);
 }
 
-static void *module_memory_alloc(unsigned int size, enum mod_mem_type type)
+static int module_memory_alloc(struct module *mod, enum mod_mem_type type)
 {
+	unsigned int size = PAGE_ALIGN(mod->mem[type].size);
+	void *ptr;
+
+	mod->mem[type].size = size;
+
 	if (mod_mem_use_vmalloc(type))
-		return vzalloc(size);
-	return module_alloc(size);
+		ptr = vmalloc(size);
+	else
+		ptr = module_alloc(size);
+
+	if (!ptr)
+		return -ENOMEM;
+
+	/*
+	 * The pointer to these blocks of memory are stored on the module
+	 * structure and we keep that around so long as the module is
+	 * around. We only free that memory when we unload the module.
+	 * Just mark them as not being a leak then. The .init* ELF
+	 * sections *do* get freed after boot so we *could* treat them
+	 * slightly differently with kmemleak_ignore() and only grey
+	 * them out as they work as typical memory allocations which
+	 * *do* eventually get freed, but let's just keep things simple
+	 * and avoid *any* false positives.
+	 */
+	kmemleak_not_leak(ptr);
+
+	memset(ptr, 0, size);
+	mod->mem[type].base = ptr;
+
+	return 0;
 }
 
-static void module_memory_free(void *ptr, enum mod_mem_type type)
+static void module_memory_free(struct module *mod, enum mod_mem_type type)
 {
+	void *ptr = mod->mem[type].base;
+
 	if (mod_mem_use_vmalloc(type))
 		vfree(ptr);
 	else
@@ -1229,12 +1258,12 @@ static void free_mod_mem(struct module *mod)
 		/* Free lock-classes; relies on the preceding sync_rcu(). */
 		lockdep_free_key_range(mod_mem->base, mod_mem->size);
 		if (mod_mem->size)
-			module_memory_free(mod_mem->base, type);
+			module_memory_free(mod, type);
 	}
 
 	/* MOD_DATA hosts mod, so free it at last */
 	lockdep_free_key_range(mod->mem[MOD_DATA].base, mod->mem[MOD_DATA].size);
-	module_memory_free(mod->mem[MOD_DATA].base, MOD_DATA);
+	module_memory_free(mod, MOD_DATA);
 }
 
 /* Free a module, remove from lists, etc. */
@@ -2225,7 +2254,6 @@ static int find_module_sections(struct module *mod, struct load_info *info)
 static int move_module(struct module *mod, struct load_info *info)
 {
 	int i;
-	void *ptr;
 	enum mod_mem_type t = 0;
 	int ret = -ENOMEM;
 
@@ -2234,26 +2262,12 @@ static int move_module(struct module *mod, struct load_info *info)
 			mod->mem[type].base = NULL;
 			continue;
 		}
-		mod->mem[type].size = PAGE_ALIGN(mod->mem[type].size);
-		ptr = module_memory_alloc(mod->mem[type].size, type);
-		/*
-                 * The pointer to these blocks of memory are stored on the module
-                 * structure and we keep that around so long as the module is
-                 * around. We only free that memory when we unload the module.
-                 * Just mark them as not being a leak then. The .init* ELF
-                 * sections *do* get freed after boot so we *could* treat them
-                 * slightly differently with kmemleak_ignore() and only grey
-                 * them out as they work as typical memory allocations which
-                 * *do* eventually get freed, but let's just keep things simple
-                 * and avoid *any* false positives.
-		 */
-		kmemleak_not_leak(ptr);
-		if (!ptr) {
+
+		ret = module_memory_alloc(mod, type);
+		if (ret) {
 			t = type;
 			goto out_enomem;
 		}
-		memset(ptr, 0, mod->mem[type].size);
-		mod->mem[type].base = ptr;
 	}
 
 	/* Transfer each section which specifies SHF_ALLOC */
@@ -2296,7 +2310,7 @@ static int move_module(struct module *mod, struct load_info *info)
 	return 0;
 out_enomem:
 	for (t--; t >= 0; t--)
-		module_memory_free(mod->mem[t].base, t);
+		module_memory_free(mod, t);
 	return ret;
 }
 
-- 
2.43.0


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