From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Helge Deller <deller@gmx.de>,
John David Anglin <dave.anglin@bell.net>,
Sasha Levin <sashal@kernel.org>,
James.Bottomley@HansenPartnership.com, svens@stackframe.org,
linux-parisc@vger.kernel.org
Subject: [PATCH AUTOSEL 4.14 05/14] parisc: Provide an extru_safe() macro to extract unsigned bits
Date: Tue, 30 Nov 2021 09:53:06 -0500 [thread overview]
Message-ID: <20211130145317.946676-5-sashal@kernel.org> (raw)
In-Reply-To: <20211130145317.946676-1-sashal@kernel.org>
From: Helge Deller <deller@gmx.de>
[ Upstream commit 169d1a4a2adb2c246396c56aa2f9eec3868546f1 ]
The extru instruction leaves the most significant 32 bits of the
target register in an undefined state on PA 2.0 systems.
Provide a macro to safely use extru on 32- and 64-bit machines.
Suggested-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/parisc/include/asm/assembly.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/parisc/include/asm/assembly.h b/arch/parisc/include/asm/assembly.h
index eb83d65153b83..2272cbeb65f22 100644
--- a/arch/parisc/include/asm/assembly.h
+++ b/arch/parisc/include/asm/assembly.h
@@ -153,6 +153,17 @@
extrd,u \r, 63-(\sa), 64-(\sa), \t
.endm
+ /* Extract unsigned for 32- and 64-bit
+ * The extru instruction leaves the most significant 32 bits of the
+ * target register in an undefined state on PA 2.0 systems. */
+ .macro extru_safe r, p, len, t
+#ifdef CONFIG_64BIT
+ extrd,u \r, 32+(\p), \len, \t
+#else
+ extru \r, \p, \len, \t
+#endif
+ .endm
+
/* load 32-bit 'value' into 'reg' compensating for the ldil
* sign-extension when running in wide mode.
* WARNING!! neither 'value' nor 'reg' can be expressions
--
2.33.0
next prev parent reply other threads:[~2021-11-30 15:07 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-30 14:53 [PATCH AUTOSEL 4.14 01/14] ASoC: mediatek: mt8173-rt5650: Rename Speaker control to Ext Spk Sasha Levin
2021-11-30 14:53 ` [PATCH AUTOSEL 4.14 02/14] xen/privcmd: make option visible in Kconfig Sasha Levin
2021-11-30 14:53 ` [PATCH AUTOSEL 4.14 03/14] NFSv4.1: handle NFS4ERR_NOSPC by CREATE_SESSION Sasha Levin
2021-11-30 14:53 ` [PATCH AUTOSEL 4.14 04/14] HID: multitouch: Fix Iiyama ProLite T1931SAW (0eef:0001 again!) Sasha Levin
2021-11-30 14:53 ` Sasha Levin [this message]
2021-11-30 14:53 ` [PATCH AUTOSEL 4.14 06/14] scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select() Sasha Levin
2021-11-30 14:53 ` [PATCH AUTOSEL 4.14 07/14] i2c: i801: Fix interrupt storm from SMB_ALERT signal Sasha Levin
2021-11-30 14:53 ` [PATCH AUTOSEL 4.14 08/14] mmc: spi: Add device-tree SPI IDs Sasha Levin
2021-11-30 14:53 ` [PATCH AUTOSEL 4.14 09/14] net: chelsio: cxgb4vf: Fix an error code in cxgb4vf_pci_probe() Sasha Levin
2021-11-30 14:53 ` [PATCH AUTOSEL 4.14 10/14] smb2: clarify rc initialization in smb2_reconnect Sasha Levin
2021-11-30 14:53 ` [PATCH AUTOSEL 4.14 11/14] PM: hibernate: Fix snapshot partial write lengths Sasha Levin
2021-11-30 14:53 ` [PATCH AUTOSEL 4.14 12/14] net: qed: fix the array may be out of bound Sasha Levin
2021-11-30 14:53 ` [PATCH AUTOSEL 4.14 13/14] net: ptp: add a definition for the UDP port for IEEE 1588 general messages Sasha Levin
2021-11-30 14:53 ` [PATCH AUTOSEL 4.14 14/14] fs: ntfs: Limit NTFS_RW to page sizes smaller than 64k Sasha Levin
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