From: Shuah Khan <skhan@linuxfoundation.org>
To: rafael@kernel.org, james.morse@arm.com, tony.luck@intel.com,
bp@alien8.de, gregkh@linuxfoundation.org, keescook@chromium.org
Cc: Shuah Khan <skhan@linuxfoundation.org>,
linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [RFC PATCH 06/11] drivers/acpi/apei: convert seqno counter_atomic
Date: Tue, 22 Sep 2020 19:43:35 -0600 [thread overview]
Message-ID: <11a005f6cc48c6411c0554ed5f40add8928669d2.1600816121.git.skhan@linuxfoundation.org> (raw)
In-Reply-To: <cover.1600816121.git.skhan@linuxfoundation.org>
counter_atomic is introduced to be used when a variable is used as
a simple counter and doesn't guard object lifetimes. This clearly
differentiates atomic_t usages that guard object lifetimes.
counter_atomic variables will wrap around to 0 when it overflows and
should not be used to guard resource lifetimes, device usage and
open counts that control state changes, and pm states.
seqno is a sequence number counter for logging. This counter gets
incremented. Unsure if there is a chance of this overflowing. It
doesn't look like overflowing causes any problems since it is used
to tag the log messages and nothing more.
Convert it to use counter_atomic.
This conversion doesn't change the oveflow wrap around behavior.
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
---
drivers/acpi/apei/ghes.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 81bf71b10d44..88a660f9c22c 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -41,6 +41,7 @@
#include <linux/uuid.h>
#include <linux/ras.h>
#include <linux/task_work.h>
+#include <linux/counters.h>
#include <acpi/actbl1.h>
#include <acpi/ghes.h>
@@ -562,7 +563,7 @@ static void __ghes_print_estatus(const char *pfx,
const struct acpi_hest_generic *generic,
const struct acpi_hest_generic_status *estatus)
{
- static atomic_t seqno;
+ static struct counter_atomic seqno = COUNTER_ATOMIC_INIT(0);
unsigned int curr_seqno;
char pfx_seq[64];
@@ -573,7 +574,7 @@ static void __ghes_print_estatus(const char *pfx,
else
pfx = KERN_ERR;
}
- curr_seqno = atomic_inc_return(&seqno);
+ curr_seqno = counter_atomic_inc_return(&seqno);
snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}" HW_ERR, pfx, curr_seqno);
printk("%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
pfx_seq, generic->header.source_id);
--
2.25.1
next prev parent reply other threads:[~2020-09-23 1:44 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-23 1:43 [RFC PATCH 00/11] Introduce Simple atomic and non-atomic counters Shuah Khan
2020-09-23 1:43 ` [RFC PATCH 01/11] counters: Introduce counter and counter_atomic Shuah Khan
2020-09-23 10:35 ` Greg KH
2020-09-23 19:04 ` Kees Cook
2020-09-23 19:34 ` Greg KH
2020-09-23 20:54 ` Kees Cook
2020-09-23 20:48 ` Shuah Khan
2020-09-23 20:58 ` Kees Cook
2020-09-23 21:19 ` Shuah Khan
2020-09-23 22:04 ` Kees Cook
2020-09-23 1:43 ` [RFC PATCH 02/11] selftests:lib: add new test for counters Shuah Khan
2020-09-23 1:43 ` [RFC PATCH 03/11] drivers/base: convert deferred_trigger_count and probe_count to counter_atomic Shuah Khan
2020-09-23 10:30 ` Greg KH
2020-09-23 1:43 ` [RFC PATCH 04/11] drivers/base/devcoredump: convert devcd_count " Shuah Khan
2020-09-23 10:31 ` Greg KH
2020-09-23 1:43 ` [RFC PATCH 05/11] drivers/acpi: convert seqno counter_atomic Shuah Khan
2020-09-24 11:13 ` Rafael J. Wysocki
2020-09-24 15:08 ` Shuah Khan
2020-09-24 15:32 ` Rafael J. Wysocki
2020-09-23 1:43 ` Shuah Khan [this message]
2020-09-23 1:43 ` [RFC PATCH 07/11] drivers/android/binder: convert stats, transaction_log to counter_atomic Shuah Khan
2020-09-23 5:10 ` Greg KH
2020-09-23 19:04 ` Kees Cook
2020-09-23 19:31 ` Greg KH
2020-09-23 20:51 ` Kees Cook
2020-09-23 1:43 ` [RFC PATCH 08/11] drivers/base/test/test_async_driver_probe: convert to use counter_atomic Shuah Khan
2020-09-23 10:33 ` Greg KH
2020-09-23 1:43 ` [RFC PATCH 09/11] drivers/char/ipmi: convert stats " Shuah Khan
2020-09-23 1:43 ` [RFC PATCH 10/11] drivers/misc/vmw_vmci: convert num guest devices counter to counter_atomic Shuah Khan
2020-09-23 10:29 ` Greg KH
2020-09-23 1:43 ` [RFC PATCH 11/11] drivers/edac: convert pci counters " Shuah Khan
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