github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-06 21:45:45 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

ARM: 9197/1: spectre-bhb: fix loop8 sequence for Thumb2

Browse Source 
[ Upstream commit 3cfb301997 ]

In Thumb2, 'b . + 4' produces a branch instruction that uses a narrow
encoding, and so it does not jump to the following instruction as
expected. So use W(b) instead.

Fixes: 6c7cb60bff ("ARM: fix Thumb2 regression with Spectre BHB")
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ard Biesheuvel 2022-04-20 09:46:17 +01:00 committed by Greg Kroah-Hartman
parent 1756b45d8d
commit a89888648e
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/kernel/entry-armv.S
View File

@ -1043,7 +1043,7 @@ vector_bhb_loop8_\name:
@ bhb workaround @ bhb workaround
mov r0, #8 mov r0, #8
3: b . + 4 3: W(b) . + 4
subs r0, r0, #1 subs r0, r0, #1
bne 3b bne 3b
dsb dsb