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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
	Stafford Horne <shorne@gmail.com>,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.4 41/54] openrisc: Define memory barrier mb
Date: Mon, 31 May 2021 15:14:07 +0200	[thread overview]
Message-ID: <20210531130636.363318707@linuxfoundation.org> (raw)
In-Reply-To: <20210531130635.070310929@linuxfoundation.org>

From: Peter Zijlstra <peterz@infradead.org>

[ Upstream commit 8b549c18ae81dbc36fb11e4aa08b8378c599ca95 ]

This came up in the discussion of the requirements of qspinlock on an
architecture.  OpenRISC uses qspinlock, but it was noticed that the
memmory barrier was not defined.

Peter defined it in the mail thread writing:

    As near as I can tell this should do. The arch spec only lists
    this one instruction and the text makes it sound like a completion
    barrier.

This is correct so applying this patch.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
[shorne@gmail.com:Turned the mail into a patch]
Signed-off-by: Stafford Horne <shorne@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/openrisc/include/asm/barrier.h | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 arch/openrisc/include/asm/barrier.h

diff --git a/arch/openrisc/include/asm/barrier.h b/arch/openrisc/include/asm/barrier.h
new file mode 100644
index 000000000000..7538294721be
--- /dev/null
+++ b/arch/openrisc/include/asm/barrier.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_BARRIER_H
+#define __ASM_BARRIER_H
+
+#define mb() asm volatile ("l.msync" ::: "memory")
+
+#include <asm-generic/barrier.h>
+
+#endif /* __ASM_BARRIER_H */
-- 
2.30.2




  parent reply	other threads:[~2021-05-31 13:20 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-31 13:13 [PATCH 4.4 00/54] 4.4.271-rc1 review Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 01/54] mm, vmstat: drop zone->lock in /proc/pagetypeinfo Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 02/54] netfilter: x_tables: Use correct memory barriers Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 03/54] NFC: nci: fix memory leak in nci_allocate_device Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 04/54] proc: Check /proc/$pid/attr/ writes against file opener Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 05/54] net: hso: fix control-request directions Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 06/54] mac80211: assure all fragments are encrypted Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 07/54] mac80211: prevent mixed key and fragment cache attacks Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 08/54] dm snapshot: properly fix a crash when an origin has no snapshots Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 09/54] kgdb: fix gcc-11 warnings harder Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 10/54] misc/uss720: fix memory leak in uss720_probe Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 11/54] mei: request autosuspend after sending rx flow control Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 12/54] staging: iio: cdc: ad7746: avoid overwrite of num_channels Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 13/54] iio: adc: ad7793: Add missing error code in ad7793_setup() Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 14/54] USB: trancevibrator: fix control-request direction Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 15/54] serial: rp2: use request_firmware instead of request_firmware_nowait Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 16/54] USB: serial: option: add Telit LE910-S1 compositions 0x7010, 0x7011 Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 17/54] USB: serial: ftdi_sio: add IDs for IDS GmbH Products Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 18/54] USB: serial: pl2303: add device id for ADLINK ND-6530 GC Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 19/54] net: usb: fix memory leak in smsc75xx_bind Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 20/54] spi: Fix use-after-free with devm_spi_alloc_* Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 21/54] spi: spi-sh: Fix use-after-free on unbind Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 22/54] Bluetooth: cmtp: fix file refcount when cmtp_attach_device fails Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 23/54] NFS: fix an incorrect limit in filelayout_decode_layout() Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 24/54] NFS: Dont corrupt the value of pg_bytes_written in nfs_do_recoalesce() Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 25/54] NFSv4: Fix v4.0/v4.1 SEEK_DATA return -ENOTSUPP when set NFS_V4_2 config Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 26/54] net/mlx4: Fix EEPROM dump support Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 27/54] Revert "net:tipc: Fix a double free in tipc_sk_mcast_rcv" Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 28/54] tipc: skb_linearize the head skb when reassembling msgs Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 29/54] i2c: s3c2410: fix possible NULL pointer deref on read message after write Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 30/54] i2c: i801: Dont generate an interrupt on bus reset Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 31/54] platform/x86: hp_accel: Avoid invoking _INI to speed up resume Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 32/54] net: fujitsu: fix potential null-ptr-deref Greg Kroah-Hartman
2021-05-31 13:13 ` [PATCH 4.4 33/54] net: caif: remove BUG_ON(dev == NULL) in caif_xmit Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 34/54] char: hpet: add checks after calling ioremap Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 35/54] ALSA: sb8: Add a comment note regarding an unused pointer Greg Kroah-Hartman
2021-05-31 20:36   ` Pavel Machek
2021-05-31 21:43     ` Sasha Levin
2021-05-31 13:14 ` [PATCH 4.4 36/54] isdn: mISDNinfineon: check/cleanup ioremap failure correctly in setup_io Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 37/54] libertas: register sysfs groups properly Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 38/54] media: dvb: Add check on sp8870_readreg return Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 39/54] media: gspca: properly check for errors in po1030_probe() Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 40/54] scsi: BusLogic: Fix 64-bit system enumeration error for Buslogic Greg Kroah-Hartman
2021-05-31 13:14 ` Greg Kroah-Hartman [this message]
2021-05-31 13:14 ` [PATCH 4.4 42/54] btrfs: do not BUG_ON in link_to_fixup_dir Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 43/54] drm/amdgpu: Fix a use-after-free Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 44/54] net: netcp: Fix an error message Greg Kroah-Hartman
2021-05-31 18:41   ` Marion & Christophe JAILLET
2021-05-31 13:14 ` [PATCH 4.4 45/54] net: bnx2: Fix error return code in bnx2_init_board() Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 46/54] mld: fix panic in mld_newpack() Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 47/54] staging: emxx_udc: fix loop in _nbu2ss_nuke() Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 48/54] scsi: libsas: Use _safe() loop in sas_resume_port() Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 49/54] sch_dsmark: fix a NULL deref in qdisc_reset() Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 50/54] MIPS: alchemy: xxs1500: add gpio-au1000.h header file Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 51/54] MIPS: ralink: export rt_sysc_membase for rt2880_wdt.c Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 52/54] hugetlbfs: hugetlb_fault_mutex_hash() cleanup Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 53/54] bluetooth: eliminate the potential race condition when removing the HCI controller Greg Kroah-Hartman
2021-05-31 13:14 ` [PATCH 4.4 54/54] usb: core: reduce power-on-good delay time of root hub Greg Kroah-Hartman
2021-05-31 19:07 ` [PATCH 4.4 00/54] 4.4.271-rc1 review Pavel Machek

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