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authorLinus Torvalds <torvalds@linux-foundation.org>2022-12-13 14:05:39 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2022-12-13 14:05:39 -0800
commit3ba2c3ff98ea8bfb219288dbacf2a23a902c751b (patch)
tree90165b304a5b0cf50bc88883ca7a61f1cec65b8c /kernel/livepatch
parent0015edd6f66172f93aa720192020138ca13ba0a6 (diff)
parent4f1354d5c6a3264c91238962d1597eef40c40419 (diff)
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Merge tag 'modules-6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux
Pull modules updates from Luis Chamberlain: "Tux gets for xmas an improvement to the average lookup performance of kallsyms_lookup_name() by 715x thanks to the work by Zhen Lei, which upgraded our old implementation from being O(n) to O(log(n)), while also retaining the old implementation support on /proc/kallsyms. The only penalty was increasing the memory footprint by 3 * kallsyms_num_syms. Folks who want to improve this further now also have a dedicated selftest facility through KALLSYMS_SELFTEST. Stephen Boyd added zstd in-kernel decompression support, but the only users of this would be folks using the load-pin LSM because otherwise we do module decompression in userspace. The only other thing with mentioning is a minor boot time optimization by Rasmus Villemoes which deferes param_sysfs_init() to late init. The rest is cleanups and minor fixes" * tag 'modules-6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux: livepatch: Call klp_match_callback() in klp_find_callback() to avoid code duplication module/decompress: Support zstd in-kernel decompression kallsyms: Remove unneeded semicolon kallsyms: Add self-test facility livepatch: Use kallsyms_on_each_match_symbol() to improve performance kallsyms: Add helper kallsyms_on_each_match_symbol() kallsyms: Reduce the memory occupied by kallsyms_seqs_of_names[] kallsyms: Correctly sequence symbols when CONFIG_LTO_CLANG=y kallsyms: Improve the performance of kallsyms_lookup_name() scripts/kallsyms: rename build_initial_tok_table() module: Fix NULL vs IS_ERR checking for module_get_next_page kernel/params.c: defer most of param_sysfs_init() to late_initcall time module: Remove unused macros module_addr_min/max module: remove redundant module_sysfs_initialized variable
Diffstat (limited to 'kernel/livepatch')
-rw-r--r--kernel/livepatch/core.c31
1 files changed, 19 insertions, 12 deletions
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 9ada0bc5247b..201f0c0482fb 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -125,20 +125,10 @@ struct klp_find_arg {
unsigned long pos;
};
-static int klp_find_callback(void *data, const char *name,
- struct module *mod, unsigned long addr)
+static int klp_match_callback(void *data, unsigned long addr)
{
struct klp_find_arg *args = data;
- if ((mod && !args->objname) || (!mod && args->objname))
- return 0;
-
- if (strcmp(args->name, name))
- return 0;
-
- if (args->objname && strcmp(args->objname, mod->name))
- return 0;
-
args->addr = addr;
args->count++;
@@ -153,6 +143,23 @@ static int klp_find_callback(void *data, const char *name,
return 0;
}
+static int klp_find_callback(void *data, const char *name,
+ struct module *mod, unsigned long addr)
+{
+ struct klp_find_arg *args = data;
+
+ if ((mod && !args->objname) || (!mod && args->objname))
+ return 0;
+
+ if (strcmp(args->name, name))
+ return 0;
+
+ if (args->objname && strcmp(args->objname, mod->name))
+ return 0;
+
+ return klp_match_callback(data, addr);
+}
+
static int klp_find_object_symbol(const char *objname, const char *name,
unsigned long sympos, unsigned long *addr)
{
@@ -167,7 +174,7 @@ static int klp_find_object_symbol(const char *objname, const char *name,
if (objname)
module_kallsyms_on_each_symbol(klp_find_callback, &args);
else
- kallsyms_on_each_symbol(klp_find_callback, &args);
+ kallsyms_on_each_match_symbol(klp_match_callback, name, &args);
/*
* Ensure an address was found. If sympos is 0, ensure symbol is unique;