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authorJohan Hovold <johan@kernel.org>2020-11-23 11:23:15 +0100
committerJessica Yu <jeyu@kernel.org>2020-11-25 15:44:46 +0100
commitb112082c8930e7aa72422484b2d31d3aa06f58bc (patch)
tree3de6d98d856660365e4be2e1d3f47de9216aaecd /include/linux/module.h
parent0801a0073f86e020987acbbd96b50f9c85d79de8 (diff)
module: simplify version-attribute handling
Instead of using the array-of-pointers trick to avoid having gcc mess up the built-in module-version array stride, specify type alignment when declaring entries to prevent gcc from increasing alignment. This is essentially an alternative (one-line) fix to the problem addressed by commit b4bc842802db ("module: deal with alignment issues in built-in module versions"). gcc can increase the alignment of larger objects with static extent as an optimisation, but this can be suppressed by using the aligned attribute when declaring variables. Note that we have been relying on this behaviour for kernel parameters for 16 years and it indeed hasn't changed since the introduction of the aligned attribute in gcc-3.1. Link: https://lore.kernel.org/lkml/20201103175711.10731-1-johan@kernel.org Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Jessica Yu <jeyu@kernel.org>
Diffstat (limited to 'include/linux/module.h')
-rw-r--r--include/linux/module.h26
1 files changed, 13 insertions, 13 deletions
diff --git a/include/linux/module.h b/include/linux/module.h
index 293250958512..5958075ea3f4 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -266,20 +266,20 @@ extern typeof(name) __mod_##type##__##name##_device_table \
#else
#define MODULE_VERSION(_version) \
MODULE_INFO(version, _version); \
- static struct module_version_attribute ___modver_attr = { \
- .mattr = { \
- .attr = { \
- .name = "version", \
- .mode = S_IRUGO, \
+ static struct module_version_attribute __modver_attr \
+ __used __section("__modver") \
+ __aligned(__alignof__(struct module_version_attribute)) \
+ = { \
+ .mattr = { \
+ .attr = { \
+ .name = "version", \
+ .mode = S_IRUGO, \
+ }, \
+ .show = __modver_version_show, \
}, \
- .show = __modver_version_show, \
- }, \
- .module_name = KBUILD_MODNAME, \
- .version = _version, \
- }; \
- static const struct module_version_attribute \
- __used __section("__modver") \
- * __moduleparam_const __modver_attr = &___modver_attr
+ .module_name = KBUILD_MODNAME, \
+ .version = _version, \
+ };
#endif
/* Optional firmware file (or files) needed by the module