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authorGeert Uytterhoeven <geert@linux-m68k.org>2017-10-03 21:14:38 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-08-07 10:38:42 +0300
commite4efec8c28bce3be6078657f0846e59ccded593b (patch)
tree54305ce33276773e12802673366b639dc5fd12c5 /arch/arm
parentbaf191c492c6592430ce684fb3464120d47d11f9 (diff)
downloadlinux-e4efec8c28bce3be6078657f0846e59ccded593b.tar.xz
ARM: 8702/1: head-common.S: Clear lr before jumping to start_kernel()
commit 59b6359dd92d18f5dc04b14a4c926fa08ab66f7c upstream. If CONFIG_DEBUG_LOCK_ALLOC=y, the kernel log is spammed with a few hundred identical messages: unwind: Unknown symbol address c0800300 unwind: Index not found c0800300 c0800300 is the return address from the last subroutine call (to __memzero()) in __mmap_switched(). Apparently having this address in the link register confuses the unwinder. To fix this, reset the link register to zero before jumping to start_kernel(). Fixes: 9520b1a1b5f7a348 ("ARM: head-common.S: speed up startup code") Suggested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/kernel/head-common.S1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/kernel/head-common.S b/arch/arm/kernel/head-common.S
index 7e662bdd5cb3..932b2244e709 100644
--- a/arch/arm/kernel/head-common.S
+++ b/arch/arm/kernel/head-common.S
@@ -101,6 +101,7 @@ __mmap_switched:
str r2, [r6] @ Save atags pointer
cmp r7, #0
strne r0, [r7] @ Save control register values
+ mov lr, #0
b start_kernel
ENDPROC(__mmap_switched)