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From:   Mike Rapoport <rppt@kernel.org>
To:     linux-kernel@vger.kernel.org
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
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Subject: [PATCH v2 05/12] modules, execmem: drop module_alloc
Date:   Fri, 16 Jun 2023 11:50:31 +0300
Message-Id: <20230616085038.4121892-6-rppt@kernel.org>
In-Reply-To: <20230616085038.4121892-1-rppt@kernel.org>
References: <20230616085038.4121892-1-rppt@kernel.org>
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From: "Mike Rapoport (IBM)" <rppt@kernel.org>

Define default parameters for address range for code allocations using
the current values in module_alloc() and make execmem_text_alloc() use
these defaults when an architecure does not supply its specific
parameters.

With this, execmem_text_alloc() implements memory allocation in a way
compatible with module_alloc() and can be used as a replacement for
module_alloc().

Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
---
 include/linux/execmem.h      |  8 ++++++++
 include/linux/moduleloader.h | 12 ------------
 kernel/module/main.c         |  7 -------
 mm/execmem.c                 | 12 ++++++++----
 4 files changed, 16 insertions(+), 23 deletions(-)

diff --git a/include/linux/execmem.h b/include/linux/execmem.h
index 68b2bfc79993..b9a97fcdf3c5 100644
--- a/include/linux/execmem.h
+++ b/include/linux/execmem.h
@@ -4,6 +4,14 @@
 
 #include <linux/types.h>
 
+#if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \
+		!defined(CONFIG_KASAN_VMALLOC)
+#include <linux/kasan.h>
+#define MODULE_ALIGN (PAGE_SIZE << KASAN_SHADOW_SCALE_SHIFT)
+#else
+#define MODULE_ALIGN PAGE_SIZE
+#endif
+
 /**
  * struct execmem_range - definition of a memory range suitable for code and
  *			  related data allocations
diff --git a/include/linux/moduleloader.h b/include/linux/moduleloader.h
index b3374342f7af..4321682fe849 100644
--- a/include/linux/moduleloader.h
+++ b/include/linux/moduleloader.h
@@ -25,10 +25,6 @@ int module_frob_arch_sections(Elf_Ehdr *hdr,
 /* Additional bytes needed by arch in front of individual sections */
 unsigned int arch_mod_section_prepend(struct module *mod, unsigned int section);
 
-/* Allocator used for allocating struct module, core sections and init
-   sections.  Returns NULL on failure. */
-void *module_alloc(unsigned long size);
-
 /* Determines if the section name is an init section (that is only used during
  * module loading).
  */
@@ -113,12 +109,4 @@ void module_arch_cleanup(struct module *mod);
 /* Any cleanup before freeing mod->module_init */
 void module_arch_freeing_init(struct module *mod);
 
-#if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \
-		!defined(CONFIG_KASAN_VMALLOC)
-#include <linux/kasan.h>
-#define MODULE_ALIGN (PAGE_SIZE << KASAN_SHADOW_SCALE_SHIFT)
-#else
-#define MODULE_ALIGN PAGE_SIZE
-#endif
-
 #endif
diff --git a/kernel/module/main.c b/kernel/module/main.c
index 43810a3bdb81..b445c5ad863a 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -1600,13 +1600,6 @@ static void free_modinfo(struct module *mod)
 	}
 }
 
-void * __weak module_alloc(unsigned long size)
-{
-	return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
-			GFP_KERNEL, PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS,
-			NUMA_NO_NODE, __builtin_return_address(0));
-}
-
 bool __weak module_init_section(const char *name)
 {
 	return strstarts(name, ".init");
diff --git a/mm/execmem.c b/mm/execmem.c
index 2fe36dcc7bdf..a67acd75ffef 100644
--- a/mm/execmem.c
+++ b/mm/execmem.c
@@ -59,9 +59,6 @@ void *execmem_text_alloc(size_t size)
 	unsigned long fallback_end = execmem_params.modules.text.fallback_end;
 	bool kasan = execmem_params.modules.flags & EXECMEM_KASAN_SHADOW;
 
-	if (!execmem_params.modules.text.start)
-		return module_alloc(size);
-
 	return execmem_alloc(size, start, end, align, pgprot,
 			     fallback_start, fallback_end, kasan);
 }
@@ -108,8 +105,15 @@ void __init execmem_init(void)
 {
 	struct execmem_params *p = execmem_arch_params();
 
-	if (!p)
+	if (!p) {
+		p = &execmem_params;
+		p->modules.text.start = VMALLOC_START;
+		p->modules.text.end = VMALLOC_END;
+		p->modules.text.pgprot = PAGE_KERNEL_EXEC;
+		p->modules.text.alignment = 1;
+
 		return;
+	}
 
 	if (!execmem_validate_params(p))
 		return;
-- 
2.35.1