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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-03-14 13:03:21 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-03-14 13:03:21 -0700 |
| commit | fa509ff879f816ce50800d20fc87564b69f53962 (patch) | |
| tree | 5a68ded183bdd5d0d567fb800e19bfad4e17eb69 | |
| parent | 75013c6c52d80b2255ba273eedac013d58754b02 (diff) | |
| parent | 4817a52b306136c8b2b2271d8770401441e4cf79 (diff) | |
| download | linux-stable-fa509ff879f816ce50800d20fc87564b69f53962.tar.gz linux-stable-fa509ff879f816ce50800d20fc87564b69f53962.tar.bz2 linux-stable-fa509ff879f816ce50800d20fc87564b69f53962.zip | |
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
| -rw-r--r-- | include/linux/seqlock.h | 5 | ||||
| -rw-r--r-- | include/linux/u64_stats_sync.h | 7 | ||||
| -rw-r--r-- | kernel/static_call.c | 7 |
3 files changed, 9 insertions, 10 deletions
diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h index 2f7bb92b4c9e..f61e34fbaaea 100644 --- a/include/linux/seqlock.h +++ b/include/linux/seqlock.h @@ -664,10 +664,7 @@ typedef struct { * seqcount_latch_init() - runtime initializer for seqcount_latch_t * @s: Pointer to the seqcount_latch_t instance */ -static inline void seqcount_latch_init(seqcount_latch_t *s) -{ - seqcount_init(&s->seqcount); -} +#define seqcount_latch_init(s) seqcount_init(&(s)->seqcount) /** * raw_read_seqcount_latch() - pick even/odd latch data copy diff --git a/include/linux/u64_stats_sync.h b/include/linux/u64_stats_sync.h index c6abb79501b3..e81856c0ba13 100644 --- a/include/linux/u64_stats_sync.h +++ b/include/linux/u64_stats_sync.h @@ -115,12 +115,13 @@ static inline void u64_stats_inc(u64_stats_t *p) } #endif +#if BITS_PER_LONG == 32 && defined(CONFIG_SMP) +#define u64_stats_init(syncp) seqcount_init(&(syncp)->seq) +#else static inline void u64_stats_init(struct u64_stats_sync *syncp) { -#if BITS_PER_LONG == 32 && defined(CONFIG_SMP) - seqcount_init(&syncp->seq); -#endif } +#endif static inline void u64_stats_update_begin(struct u64_stats_sync *syncp) { 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); |