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Merge tag 'locking-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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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
This commit is contained in:
Linus Torvalds
2021-03-14 13:03:21 -07:00
parent 75013c6c52 4817a52b30
commit fa509ff879
3 changed files with 9 additions and 10 deletions
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7
kernel/static_call.c
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@@ -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);