[PATCH 5.15 092/110] ARM: fix Thumb2 regression with Spectre BHB

Greg Kroah-Hartman
2022-03-14T12:12:45Z

From: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

commit 6c7cb60bff7aec24b834343ff433125f469886a3 upstream.

When building for Thumb2, the vectors make use of a local label. Sadly,
the Spectre BHB code also uses a local label with the same number which
results in the Thumb2 reference pointing at the wrong place. Fix this
by changing the number used for the Spectre BHB local label.

Fixes: b9baf5c8c5c3 ("ARM: Spectre-BHB workaround")
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/arm/kernel/entry-armv.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -1038,9 +1038,9 @@ vector_bhb_loop8_\name:

@ bhb workaround
mov r0, #8
-1: b . + 4
+3: b . + 4
subs r0, r0, #1
- bne 1b
+ bne 3b
dsb
isb
b 2b