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authorLinus Torvalds <torvalds@linux-foundation.org>2021-03-14 23:03:21 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-03-14 23:03:21 +0300
commitfa509ff879f816ce50800d20fc87564b69f53962 (patch)
tree5a68ded183bdd5d0d567fb800e19bfad4e17eb69 /kernel
parent75013c6c52d80b2255ba273eedac013d58754b02 (diff)
parent4817a52b306136c8b2b2271d8770401441e4cf79 (diff)
downloadlinux-fa509ff879f816ce50800d20fc87564b69f53962.tar.xz
Merge tag 'locking-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking fixes from Thomas Gleixner: "A couple of locking fixes: - A fix for the static_call mechanism so it handles unaligned addresses correctly. - Make u64_stats_init() a macro so every instance gets a seperate lockdep key. - Make seqcount_latch_init() a macro as well to preserve the static variable which is used for the lockdep key" * tag 'locking-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: seqlock,lockdep: Fix seqcount_latch_init() u64_stats,lockdep: Fix u64_stats_init() vs lockdep static_call: Fix the module key fixup
Diffstat (limited to 'kernel')
-rw-r--r--kernel/static_call.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/static_call.c b/kernel/static_call.c
index 6906c6ec4c97..ae825295cf68 100644
--- a/kernel/static_call.c
+++ b/kernel/static_call.c
@@ -349,7 +349,8 @@ static int static_call_add_module(struct module *mod)
struct static_call_site *site;
for (site = start; site != stop; site++) {
- unsigned long addr = (unsigned long)static_call_key(site);
+ unsigned long s_key = (long)site->key + (long)&site->key;
+ unsigned long addr = s_key & ~STATIC_CALL_SITE_FLAGS;
unsigned long key;
/*
@@ -373,8 +374,8 @@ static int static_call_add_module(struct module *mod)
return -EINVAL;
}
- site->key = (key - (long)&site->key) |
- (site->key & STATIC_CALL_SITE_FLAGS);
+ key |= s_key & STATIC_CALL_SITE_FLAGS;
+ site->key = key - (long)&site->key;
}
return __static_call_init(mod, start, stop);