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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 v4 7/8] apei/ghes: Use unrcu_pointer for cmpxchg
Date: Wed, 31 Aug 2022 07:40:26 +0000	[thread overview]
Message-ID: <20220831074027.13849-8-justin.he@arm.com> (raw)
In-Reply-To: <20220831074027.13849-1-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 d11e3b2e5345..bbd96e91bec1 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


  parent reply	other threads:[~2022-08-31  7:42 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-31  7:40 [PATCH v4 0/8] Make ghes_edac a proper module Jia He
2022-08-31  7:40 ` [PATCH v4 1/8] efi/cper: export several helpers for ghes_edac to use Jia He
2022-08-31  7:40 ` [PATCH v4 2/8] EDAC/ghes: Add a notifier for reporting memory errors Jia He
2022-08-31  7:40 ` [PATCH v4 3/8] EDAC:ghes: Move ghes_edac.force_load to ghes module parameter Jia He
2022-09-02 14:54   ` Kani, Toshi
2022-08-31  7:40 ` [PATCH v4 4/8] ghes: Introduce a helper ghes_edac_preferred() Jia He
2022-09-02 15:30   ` Kani, Toshi
2022-08-31  7:40 ` [PATCH v4 5/8] EDAC/ghes: Make ghes_edac a proper module to remove the dependency on ghes Jia He
2022-09-02 17:13   ` Kani, Toshi
2022-09-05 14:33     ` Justin He
2022-08-31  7:40 ` [PATCH v4 6/8] EDAC: Add the ghes_edac_preferred check for chipset-specific edac drivers Jia He
2022-09-02 15:48   ` Kani, Toshi
2022-08-31  7:40 ` Jia He [this message]
2022-08-31  7:40 ` [PATCH v4 8/8] EDAC/igen6: Return consistent errno when another edac driver is enabled Jia He

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