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authorSong Liu <song@kernel.org>2023-02-07 03:28:02 +0300
committerLuis Chamberlain <mcgrof@kernel.org>2023-03-09 23:55:15 +0300
commitac3b43283923440900b4f36ca5f9f0b1ca43b70e (patch)
tree32430a7fa302c652cd2fc675dc0435e0792b9710 /arch/ia64
parentfe15c26ee26efa11741a7b632e9f23b01aca4cc6 (diff)
downloadlinux-ac3b43283923440900b4f36ca5f9f0b1ca43b70e.tar.xz
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/ia64')
-rw-r--r--arch/ia64/kernel/module.c24
1 files changed, 14 insertions, 10 deletions
diff --git a/arch/ia64/kernel/module.c b/arch/ia64/kernel/module.c
index 8f62cf97f691..3661135da9d9 100644
--- a/arch/ia64/kernel/module.c
+++ b/arch/ia64/kernel/module.c
@@ -485,19 +485,19 @@ module_frob_arch_sections (Elf_Ehdr *ehdr, Elf_Shdr *sechdrs, char *secstrings,
return 0;
}
-static inline int
+static inline bool
in_init (const struct module *mod, uint64_t addr)
{
- return addr - (uint64_t) mod->init_layout.base < mod->init_layout.size;
+ return within_module_init(addr, mod);
}
-static inline int
+static inline bool
in_core (const struct module *mod, uint64_t addr)
{
- return addr - (uint64_t) mod->core_layout.base < mod->core_layout.size;
+ return within_module_core(addr, mod);
}
-static inline int
+static inline bool
is_internal (const struct module *mod, uint64_t value)
{
return in_init(mod, value) || in_core(mod, value);
@@ -677,7 +677,8 @@ do_reloc (struct module *mod, uint8_t r_type, Elf64_Sym *sym, uint64_t addend,
break;
case RV_BDREL:
- val -= (uint64_t) (in_init(mod, val) ? mod->init_layout.base : mod->core_layout.base);
+ val -= (uint64_t) (in_init(mod, val) ? mod->mem[MOD_INIT_TEXT].base :
+ mod->mem[MOD_TEXT].base);
break;
case RV_LTV:
@@ -812,15 +813,18 @@ apply_relocate_add (Elf64_Shdr *sechdrs, const char *strtab, unsigned int symind
* addresses have been selected...
*/
uint64_t gp;
- if (mod->core_layout.size > MAX_LTOFF)
+ struct module_memory *mod_mem;
+
+ mod_mem = &mod->mem[MOD_DATA];
+ if (mod_mem->size > MAX_LTOFF)
/*
* This takes advantage of fact that SHF_ARCH_SMALL gets allocated
* at the end of the module.
*/
- gp = mod->core_layout.size - MAX_LTOFF / 2;
+ gp = mod_mem->size - MAX_LTOFF / 2;
else
- gp = mod->core_layout.size / 2;
- gp = (uint64_t) mod->core_layout.base + ((gp + 7) & -8);
+ gp = mod_mem->size / 2;
+ gp = (uint64_t) mod_mem->base + ((gp + 7) & -8);
mod->arch.gp = gp;
DEBUGP("%s: placing gp at 0x%lx\n", __func__, gp);
}