From b112082c8930e7aa72422484b2d31d3aa06f58bc Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Mon, 23 Nov 2020 11:23:15 +0100 Subject: 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 Signed-off-by: Jessica Yu --- kernel/params.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) (limited to 'kernel/params.c') diff --git a/kernel/params.c b/kernel/params.c index 3835fb82c64b..aa7d6f2213f1 100644 --- a/kernel/params.c +++ b/kernel/params.c @@ -843,18 +843,16 @@ ssize_t __modver_version_show(struct module_attribute *mattr, return scnprintf(buf, PAGE_SIZE, "%s\n", vattr->version); } -extern const struct module_version_attribute *__start___modver[]; -extern const struct module_version_attribute *__stop___modver[]; +extern const struct module_version_attribute __start___modver[]; +extern const struct module_version_attribute __stop___modver[]; static void __init version_sysfs_builtin(void) { - const struct module_version_attribute **p; + const struct module_version_attribute *vattr; struct module_kobject *mk; int err; - for (p = __start___modver; p < __stop___modver; p++) { - const struct module_version_attribute *vattr = *p; - + for (vattr = __start___modver; vattr < __stop___modver; vattr++) { mk = locate_module_kobject(vattr->module_name); if (mk) { err = sysfs_create_file(&mk->kobj, &vattr->mattr.attr); -- cgit v1.2.3