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authorMike Rapoport (IBM) <rppt@kernel.org>2024-05-05 19:06:18 +0300
committerLuis Chamberlain <mcgrof@kernel.org>2024-05-14 10:31:43 +0300
commit12af2b83d0b17ec8b379b721dd4a8fbcd5d791f3 (patch)
treec04ce85d6f0d1c09aec941554f4623719581ce84 /mm/Kconfig
parentbc6b94d3ea062454ca889884db99e145efffcb93 (diff)
downloadlinux-12af2b83d0b17ec8b379b721dd4a8fbcd5d791f3.tar.xz
mm: introduce execmem_alloc() and execmem_free()
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>
Diffstat (limited to 'mm/Kconfig')
-rw-r--r--mm/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index f30a18a0e37d..8bb60fdaba3c 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -1240,6 +1240,9 @@ config LOCK_MM_AND_FIND_VMA
config IOMMU_MM_DATA
bool
+config EXECMEM
+ bool
+
source "mm/damon/Kconfig"
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