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riscv: avoid Imbalance in RAS

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[ Upstream commit 8f1534e7440382d118c3d655d3a6014128b2086d ]

Inspired by[1], modify the code to remove the code of modifying ra to
avoid imbalance RAS (return address stack) which may lead to incorret
predictions on return.

Link: https://lore.kernel.org/linux-riscv/20240607061335.2197383-1-cyrilbur@tenstorrent.com/ [1]
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Reviewed-by: Cyril Bur <cyrilbur@tenstorrent.com>
Link: https://lore.kernel.org/r/20240720170659.1522-1-jszhang@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jisheng Zhang
2024-07-21 01:06:59 +08:00
committed by Greg Kroah-Hartman
parent 50c4307e82
commit a29a9c2c9d
1 changed files with 2 additions and 2 deletions
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4
arch/riscv/kernel/entry.S
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@@ -219,8 +219,8 @@ SYM_CODE_START(ret_from_fork)
jalr s0
1:
move a0, sp /* pt_regs */
la ra, ret_from_exception
tail syscall_exit_to_user_mode
call syscall_exit_to_user_mode
j ret_from_exception
SYM_CODE_END(ret_from_fork)
/*