[RFC PATCH] ARM: update legacy CPU ID in decompressor cache support jump table

[sboyd@codeaurora.org (Stephen Boyd)]

On 06/03, Marc C wrote:
> Hello,
> 
> The following is a formal RFC PATCH for the suggestion offered by rmk
> in this thread:
> http://lists.infradead.org/pipermail/linux-arm-kernel/2010-January/007871.html
> 
> The previous mask values for the legacy ARM CPU IDs were conflicting
> with the CPU ID assignments for late-generation CPUs (like the
> Qualcomm MSM/QSD or Broadcom Brahma-15 processors). This change
> corrects the legacy ARM CPU ID value so that the jump table can
> fall-through to the appropriate cache maintenance / MMU functions.
> 
> To: linux-arm-kernel at lists.infradead.org
> Signed-off-by: Marc Carino <marc.ceeeee@gmail.com>
> ---
>  arch/arm/boot/compressed/head.S |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
> index fe4d9c3..a1b9e83 100644
> --- a/arch/arm/boot/compressed/head.S
> +++ b/arch/arm/boot/compressed/head.S
> @@ -805,8 +805,8 @@ call_cache_fn:      adr     r12, proc_types
>                 .align  2
>                 .type   proc_types,#object
>  proc_types:
> -               .word   0x00000000              @ old ARM ID
> -               .word   0x0000f000
> +               .word   0x41000000              @ old ARM ID
> +               .word   0xff00f000
>                 mov     pc, lr
>   THUMB(                nop                             )
>                 mov     pc, lr

I sent a similar patch and Russell just applied it[1]. It removes
this entry on V7 builds. Your patch will also work for me.

[1] http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=7736/1

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation