From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sven Schnelle <svens@linux.ibm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Sasha Levin <sashal@kernel.org>,
gor@linux.ibm.com, imbrenda@linux.ibm.com, meted@linux.ibm.com,
linux-s390@vger.kernel.org
Subject: [PATCH AUTOSEL 6.13 4/7] s390/stackleak: Use exrl instead of ex in __stackleak_poison()
Date: Sun, 26 Jan 2025 09:48:35 -0500 [thread overview]
Message-ID: <20250126144839.925271-4-sashal@kernel.org> (raw)
In-Reply-To: <20250126144839.925271-1-sashal@kernel.org>
From: Sven Schnelle <svens@linux.ibm.com>
[ Upstream commit a88c26bb8e04ee5f2678225c0130a5fbc08eef85 ]
exrl is present in all machines currently supported, therefore prefer
it over ex. This saves one instruction and doesn't need an additional
register to hold the address of the target instruction.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/s390/include/asm/processor.h | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index 8761fd01a9f09..4f8d5592c2981 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -163,8 +163,7 @@ static __always_inline void __stackleak_poison(unsigned long erase_low,
" la %[addr],256(%[addr])\n"
" brctg %[tmp],0b\n"
"1: stg %[poison],0(%[addr])\n"
- " larl %[tmp],3f\n"
- " ex %[count],0(%[tmp])\n"
+ " exrl %[count],3f\n"
" j 4f\n"
"2: stg %[poison],0(%[addr])\n"
" j 4f\n"
--
2.39.5
next prev parent reply other threads:[~2025-01-26 14:48 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-26 14:48 [PATCH AUTOSEL 6.13 1/7] arm64/mm: Ensure adequate HUGE_MAX_HSTATE Sasha Levin
2025-01-26 14:48 ` [PATCH AUTOSEL 6.13 2/7] exec: fix up /proc/pid/comm in the execveat(AT_EMPTY_PATH) case Sasha Levin
2025-01-26 14:48 ` [PATCH AUTOSEL 6.13 3/7] block: check BLK_FEAT_POLL under q_usage_count Sasha Levin
2025-01-26 14:48 ` Sasha Levin [this message]
2025-01-26 14:48 ` [PATCH AUTOSEL 6.13 5/7] btrfs: fix data race when accessing the inode's disk_i_size at btrfs_drop_extents() Sasha Levin
2025-01-26 14:48 ` [PATCH AUTOSEL 6.13 6/7] btrfs: convert BUG_ON in btrfs_reloc_cow_block() to proper error handling Sasha Levin
2025-01-26 14:48 ` [PATCH AUTOSEL 6.13 7/7] btrfs: don't use btrfs_set_item_key_safe on RAID stripe-extents Sasha Levin
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