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author | 2023-02-06 16:28:02 -0800 | |
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committer | 2023-03-09 12:55:15 -0800 | |
commit | ac3b43283923440900b4f36ca5f9f0b1ca43b70e (patch) | |
tree | 32430a7fa302c652cd2fc675dc0435e0792b9710 /arch/mips/kernel | |
parent | Linux 6.3-rc1 (diff) | |
download | linux-ac3b43283923440900b4f36ca5f9f0b1ca43b70e.tar.gz linux-ac3b43283923440900b4f36ca5f9f0b1ca43b70e.tar.bz2 linux-ac3b43283923440900b4f36ca5f9f0b1ca43b70e.zip |
module: replace module_layout with module_memory
module_layout manages different types of memory (text, data, rodata, etc.)
in one allocation, which is problematic for some reasons:
1. It is hard to enable CONFIG_STRICT_MODULE_RWX.
2. It is hard to use huge pages in modules (and not break strict rwx).
3. Many archs uses module_layout for arch-specific data, but it is not
obvious how these data are used (are they RO, RX, or RW?)
Improve the scenario by replacing 2 (or 3) module_layout per module with
up to 7 module_memory per module:
MOD_TEXT,
MOD_DATA,
MOD_RODATA,
MOD_RO_AFTER_INIT,
MOD_INIT_TEXT,
MOD_INIT_DATA,
MOD_INIT_RODATA,
and allocating them separately. This adds slightly more entries to
mod_tree (from up to 3 entries per module, to up to 7 entries per
module). However, this at most adds a small constant overhead to
__module_address(), which is expected to be fast.
Various archs use module_layout for different data. These data are put
into different module_memory based on their location in module_layout.
IOW, data that used to go with text is allocated with MOD_MEM_TYPE_TEXT;
data that used to go with data is allocated with MOD_MEM_TYPE_DATA, etc.
module_memory simplifies quite some of the module code. For example,
ARCH_WANTS_MODULES_DATA_IN_VMALLOC is a lot cleaner, as it just uses a
different allocator for the data. kernel/module/strict_rwx.c is also
much cleaner with module_memory.
Signed-off-by: Song Liu <song@kernel.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Diffstat (limited to 'arch/mips/kernel')
-rw-r--r-- | arch/mips/kernel/vpe.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c index 13294972707b..ab114c686f9d 100644 --- a/arch/mips/kernel/vpe.c +++ b/arch/mips/kernel/vpe.c @@ -199,18 +199,17 @@ static void layout_sections(struct module *mod, const Elf_Ehdr *hdr, for (m = 0; m < ARRAY_SIZE(masks); ++m) { for (i = 0; i < hdr->e_shnum; ++i) { Elf_Shdr *s = &sechdrs[i]; + struct module_memory *mod_mem; + + mod_mem = &mod->mem[MOD_TEXT]; if ((s->sh_flags & masks[m][0]) != masks[m][0] || (s->sh_flags & masks[m][1]) || s->sh_entsize != ~0UL) continue; s->sh_entsize = - get_offset((unsigned long *)&mod->core_layout.size, s); + get_offset((unsigned long *)&mod_mem->size, s); } - - if (m == 0) - mod->core_layout.text_size = mod->core_layout.size; - } } @@ -641,7 +640,7 @@ static int vpe_elfload(struct vpe *v) layout_sections(&mod, hdr, sechdrs, secstrings); } - v->load_addr = alloc_progmem(mod.core_layout.size); + v->load_addr = alloc_progmem(mod.mod_mem[MOD_TEXT].size); if (!v->load_addr) return -ENOMEM; |