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 v8 6/7] apei/ghes: Use unrcu_pointer for cmpxchg
Date: Mon, 10 Oct 2022 02:35:58 +0000 [thread overview]
Message-ID: <20221010023559.69655-7-justin.he@arm.com> (raw)
In-Reply-To: <20221010023559.69655-1-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 27c72b175e4b..c2fc0dd05bf7 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -150,7 +150,7 @@ 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;
@@ -840,8 +840,9 @@ 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:[~2022-10-10 2:37 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-10 2:35 [PATCH v8 0/7] Make ghes_edac a proper module Jia He
2022-10-10 2:35 ` [PATCH v8 1/7] efi/cper: export several helpers for ghes_edac to use Jia He
2022-10-10 2:35 ` [PATCH v8 2/7] EDAC/ghes: Add a notifier for reporting memory errors Jia He
2022-10-10 2:35 ` [PATCH v8 3/7] EDAC/ghes: Prepare to make ghes_edac a proper module Jia He
2022-10-10 2:35 ` [PATCH v8 4/7] EDAC/ghes: Make ghes_edac a proper module to remove the dependency on ghes Jia He
2022-10-10 2:35 ` [PATCH v8 5/7] EDAC: Add the ghes_get_devices() check for chipset-specific edac drivers Jia He
2022-10-10 2:35 ` Jia He [this message]
2022-10-11 10:33 ` [PATCH v8 6/7] apei/ghes: Use unrcu_pointer for cmpxchg Borislav Petkov
2022-10-11 14:32 ` Justin He
2022-10-11 14:45 ` Borislav Petkov
2022-10-12 4:35 ` Justin He
2022-10-12 12:04 ` Justin He
2022-10-13 13:37 ` Borislav Petkov
2022-10-13 15:41 ` Ard Biesheuvel
2022-10-13 16:37 ` Borislav Petkov
2022-10-13 16:45 ` Peter Zijlstra
2022-10-13 17:42 ` Borislav Petkov
2022-10-14 9:40 ` Ard Biesheuvel
2022-10-14 19:40 ` Borislav Petkov
2022-10-14 12:00 ` Justin He
2022-10-14 14:31 ` Ard Biesheuvel
2022-10-14 15:10 ` Peter Zijlstra
2022-10-14 15:24 ` Ard Biesheuvel
2022-10-17 8:47 ` Justin He
2022-10-17 9:27 ` Ard Biesheuvel
2022-10-17 11:57 ` Justin He
2022-10-13 16:41 ` Peter Zijlstra
2022-10-10 2:35 ` [PATCH v8 7/7] EDAC/igen6: Return consistent errno when another edac driver is enabled Jia He
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