5.4-stable review patch. If anyone has any objections, please let me know.
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From: Petr Tesarik petr@tesarici.cz
[ Upstream commit 38a15d0a50e0a43778561a5861403851f0b0194c ]
Fix bogus lockdep warnings if multiple u64_stats_sync variables are initialized in the same file.
With CONFIG_LOCKDEP, seqcount_init() is a macro which declares:
static struct lock_class_key __key;
Since u64_stats_init() is a function (albeit an inline one), all calls within the same file end up using the same instance, effectively treating them all as a single lock-class.
Fixes: 9464ca650008 ("net: make u64_stats_init() a function") Closes: https://lore.kernel.org/netdev/ea1567d9-ce66-45e6-8168-ac40a47d1821@roeck-us... Signed-off-by: Petr Tesarik petr@tesarici.cz Reviewed-by: Simon Horman horms@kernel.org Reviewed-by: Eric Dumazet edumazet@google.com Link: https://lore.kernel.org/r/20240404075740.30682-1-petr@tesarici.cz Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- include/linux/u64_stats_sync.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/include/linux/u64_stats_sync.h +++ b/include/linux/u64_stats_sync.h @@ -70,7 +70,11 @@ struct u64_stats_sync {
#if BITS_PER_LONG == 32 && defined(CONFIG_SMP) -#define u64_stats_init(syncp) seqcount_init(&(syncp)->seq) +#define u64_stats_init(syncp) \ + do { \ + struct u64_stats_sync *__s = (syncp); \ + seqcount_init(&__s->seq); \ + } while (0) #else static inline void u64_stats_init(struct u64_stats_sync *syncp) {