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| author | Geert Uytterhoeven <geert@linux-m68k.org> | 2017-10-03 19:14:38 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2017-10-14 15:08:33 +0100 |
| commit | 59b6359dd92d18f5dc04b14a4c926fa08ab66f7c (patch) | |
| tree | a47e00038f9641bbd203958b48c7467133c82c83 /arch/arm/kernel | |
| parent | 1bb078330b4f0836b5b12365cd8bf68d5f3bbff8 (diff) | |
| download | linux-59b6359dd92d18f5dc04b14a4c926fa08ab66f7c.tar.bz2 | |
ARM: 8702/1: head-common.S: Clear lr before jumping to start_kernel()
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>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/head-common.S | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/kernel/head-common.S b/arch/arm/kernel/head-common.S index a25027b87a60..21dde771a7dd 100644 --- a/arch/arm/kernel/head-common.S +++ b/arch/arm/kernel/head-common.S @@ -114,6 +114,7 @@ __mmap_switched: str r8, [r2] @ Save atags pointer cmp r3, #0 strne r10, [r3] @ Save control register values + mov lr, #0 b start_kernel ENDPROC(__mmap_switched) |