mirror of
https://github.com/torvalds/linux.git
synced 2024-09-20 15:03:04 +00:00
12af2b83d0
module_alloc() is used everywhere as a mean to allocate memory for code. Beside being semantically wrong, this unnecessarily ties all subsystems that need to allocate code, such as ftrace, kprobes and BPF to modules and puts the burden of code allocation to the modules code. Several architectures override module_alloc() because of various constraints where the executable memory can be located and this causes additional obstacles for improvements of code allocation. Start splitting code allocation from modules by introducing execmem_alloc() and execmem_free() APIs. Initially, execmem_alloc() is a wrapper for module_alloc() and execmem_free() is a replacement of module_memfree() to allow updating all call sites to use the new APIs. Since architectures define different restrictions on placement, permissions, alignment and other parameters for memory that can be used by different subsystems that allocate executable memory, execmem_alloc() takes a type argument, that will be used to identify the calling subsystem and to allow architectures define parameters for ranges suitable for that subsystem. No functional changes. Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org> Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Acked-by: Song Liu <song@kernel.org> Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
33 lines
707 B
C
33 lines
707 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2002 Richard Henderson
|
|
* Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM.
|
|
* Copyright (C) 2023 Luis Chamberlain <mcgrof@kernel.org>
|
|
* Copyright (C) 2024 Mike Rapoport IBM.
|
|
*/
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/execmem.h>
|
|
#include <linux/moduleloader.h>
|
|
|
|
static void *__execmem_alloc(size_t size)
|
|
{
|
|
return module_alloc(size);
|
|
}
|
|
|
|
void *execmem_alloc(enum execmem_type type, size_t size)
|
|
{
|
|
return __execmem_alloc(size);
|
|
}
|
|
|
|
void execmem_free(void *ptr)
|
|
{
|
|
/*
|
|
* This memory may be RO, and freeing RO memory in an interrupt is not
|
|
* supported by vmalloc.
|
|
*/
|
|
WARN_ON(in_interrupt());
|
|
vfree(ptr);
|
|
}
|