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: [PATCH 06/11] drivers/acpi/apei: convert seqno counter_atomic32
Date: Fri, 25 Sep 2020 17:47:20 -0600 [thread overview]
Message-ID: <c05e3d040fcaa51e275065f6d6f0b0588fdfebcd.1601073127.git.skhan@linuxfoundation.org> (raw)
In-Reply-To: <cover.1601073127.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_atomic32.
This conversion doesn't change the overflow wrap around behavior.
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
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..92169436be18 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_atomic32 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_atomic32_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:[~2020-09-25 23:47 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-25 23:47 [PATCH 00/11] Introduce Simple atomic and non-atomic counters Shuah Khan
2020-09-25 23:47 ` [PATCH 01/11] counters: Introduce counter_simple* and counter_atomic* counters Shuah Khan
2020-09-25 23:47 ` [PATCH 02/11] selftests:lib:test_counters: add new test for counters Shuah Khan
2020-09-25 23:47 ` [PATCH 03/11] drivers/base: convert deferred_trigger_count and probe_count to counter_atomic32 Shuah Khan
2020-09-25 23:47 ` [PATCH 04/11] drivers/base/devcoredump: convert devcd_count " Shuah Khan
2020-09-25 23:47 ` [PATCH 05/11] drivers/acpi: convert seqno counter_atomic32 Shuah Khan
2020-09-25 23:47 ` Shuah Khan [this message]
2020-09-25 23:47 ` [PATCH 07/11] drivers/android/binder: convert stats, transaction_log to counter_atomic32 Shuah Khan
2020-09-27 23:39 ` Joel Fernandes
2020-09-25 23:47 ` [PATCH 08/11] drivers/base/test/test_async_driver_probe: convert to use counter_atomic32 Shuah Khan
2020-09-25 23:47 ` [PATCH 09/11] drivers/char/ipmi: convert stats " Shuah Khan
2020-09-26 0:15 ` Corey Minyard
2020-09-26 2:05 ` Shuah Khan
2020-09-25 23:47 ` [PATCH 10/11] drivers/misc/vmw_vmci: convert num guest devices counter to counter_atomic32 Shuah Khan
2020-09-25 23:47 ` [PATCH 11/11] drivers/edac: convert pci counters " Shuah Khan
2020-09-28 12:05 ` Borislav Petkov
2020-09-25 23:52 ` [PATCH 00/11] Introduce Simple atomic and non-atomic counters Kees Cook
2020-09-26 0:13 ` Shuah Khan
2020-09-26 16:33 ` Kees Cook
2020-09-28 22:52 ` Shuah Khan
2020-09-26 16:22 ` Kees Cook
2020-09-28 22:42 ` Shuah Khan
2020-09-26 16:29 ` Kees Cook
2020-09-28 22:41 ` Shuah Khan
2020-09-28 23:13 ` Kees Cook
2020-10-06 15:21 ` Shuah Khan
2020-09-27 23:35 ` Joel Fernandes
2020-09-28 20:34 ` Kees Cook
2020-09-28 21:17 ` Joel Fernandes
2020-09-28 23:01 ` Shuah Khan
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