From: Jia He <justin.he@arm.com>
To: Len Brown <lenb@kernel.org>, James Morse <james.morse@arm.com>,
Tony Luck <tony.luck@intel.com>, Borislav Petkov <bp@alien8.de>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Robert Richter <rric@kernel.org>,
Robert Moore <robert.moore@intel.com>,
Qiuxu Zhuo <qiuxu.zhuo@intel.com>,
Yazen Ghannam <yazen.ghannam@amd.com>,
Jan Luebbe <jlu@pengutronix.de>,
Khuong Dinh <khuong@os.amperecomputing.com>,
Kani Toshi <toshi.kani@hpe.com>
Cc: Ard Biesheuvel <ardb@kernel.org>,
linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-edac@vger.kernel.org, devel@acpica.org,
"Rafael J . Wysocki" <rafael@kernel.org>,
Shuai Xue <xueshuai@linux.alibaba.com>,
Jarkko Sakkinen <jarkko@kernel.org>,
linux-efi@vger.kernel.org, nd@arm.com, Jia He <justin.he@arm.com>,
kernel test robot <lkp@intel.com>
Subject: [PATCH v6 7/8] apei/ghes: Use unrcu_pointer for cmpxchg
Date: Mon, 12 Sep 2022 14:40:04 +0000 [thread overview]
Message-ID: <20220912144005.212624-8-justin.he@arm.com> (raw)
In-Reply-To: <20220912144005.212624-1-justin.he@arm.com>
ghes_estatus_caches should be add rcu annotation to avoid sparse warnings.
drivers/acpi/apei/ghes.c:733:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
drivers/acpi/apei/ghes.c:733:25: sparse: struct ghes_estatus_cache [noderef] __rcu *
drivers/acpi/apei/ghes.c:733:25: sparse: struct ghes_estatus_cache *
drivers/acpi/apei/ghes.c:813:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
drivers/acpi/apei/ghes.c:813:25: sparse: struct ghes_estatus_cache [noderef] __rcu *
drivers/acpi/apei/ghes.c:813:25: sparse: struct ghes_estatus_cache *
unrcu_pointer is to strip the __rcu in cmpxchg.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jia He <justin.he@arm.com>
---
drivers/acpi/apei/ghes.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 4af269b22bd4..c0b09addb96f 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -153,7 +153,7 @@ struct ghes_vendor_record_entry {
static struct gen_pool *ghes_estatus_pool;
static unsigned long ghes_estatus_pool_size_request;
-static struct ghes_estatus_cache *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
+static struct ghes_estatus_cache __rcu *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
static atomic_t ghes_estatus_cache_alloced;
static int ghes_panic_timeout __read_mostly = 30;
@@ -843,8 +843,9 @@ static void ghes_estatus_cache_add(
}
/* new_cache must be put into array after its contents are written */
smp_wmb();
- if (slot != -1 && cmpxchg(ghes_estatus_caches + slot,
- slot_cache, new_cache) == slot_cache) {
+ if (slot != -1 && unrcu_pointer(cmpxchg(ghes_estatus_caches + slot,
+ RCU_INITIALIZER(slot_cache),
+ RCU_INITIALIZER(new_cache))) == slot_cache) {
if (slot_cache)
call_rcu(&slot_cache->rcu, ghes_estatus_cache_rcu_free);
} else
--
2.25.1
next prev parent reply other threads:[~2022-09-12 14:42 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-12 14:39 [PATCH v6 0/8] Make ghes_edac a proper module Jia He
2022-09-12 14:39 ` [PATCH v6 1/8] efi/cper: export several helpers for ghes_edac to use Jia He
2022-09-12 14:39 ` [PATCH v6 2/8] EDAC/ghes: Add a notifier for reporting memory errors Jia He
2022-09-12 14:40 ` [PATCH v6 3/8] EDAC:ghes: Move ghes_edac.force_load to ghes module parameter Jia He
2022-09-12 14:40 ` [PATCH v6 4/8] ghes: Introduce a helper ghes_edac_preferred() Jia He
2022-09-12 14:40 ` [PATCH v6 5/8] EDAC/ghes: Make ghes_edac a proper module to remove the dependency on ghes Jia He
2022-09-20 17:22 ` Borislav Petkov
2022-09-22 8:26 ` Justin He
2022-09-23 15:43 ` Borislav Petkov
2022-09-25 15:07 ` Justin He
2022-09-26 10:42 ` Borislav Petkov
2022-09-12 14:40 ` [PATCH v6 6/8] EDAC: Add the ghes_edac_preferred check for chipset-specific edac drivers Jia He
2022-09-12 14:40 ` Jia He [this message]
2022-09-12 14:40 ` [PATCH v6 8/8] EDAC/igen6: Return consistent errno when another edac driver is enabled Jia He
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