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ARM: 8702/1: head-common.S: Clear lr before jumping to start_kernel()
commit59b6359dd9
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:9520b1a1b5
("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>
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@ -101,6 +101,7 @@ __mmap_switched:
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str r2, [r6] @ Save atags pointer
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cmp r7, #0
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strne r0, [r7] @ Save control register values
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mov lr, #0
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b start_kernel
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ENDPROC(__mmap_switched)
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