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SubjectRe: Re: [PATCH v2] kbuild: Enable armthumb BCJ filter for Thumb-2 kernel
>On 2021-11-20 Jubin Zhong wrote:
>> use $SRCARCH to detect the BCJ filter. However, assigning
>> arm BCJ filter to Thumb-2 kernel is not optimal. In my case, about 5%
>> decrease of image size is observed with armthumb BCJ filter:
>> Test results:
>> hardware: QEMU emulator version 3.1.0
>> config: vexpress_defconfig with THUMB2_KERNEL & KERNEL_XZ on
>> arm BCJ: 4029808
>> armthumb BCJ: 3827280
>> Choose armthumb BCJ filter for Thumb-2 kernel to make smaller images.
>> Signed-off-by: Jubin Zhong <>

>I still didn't test it but it looks good to me.

Hi, this patch is not accepted into the kernel mainline yet.
Please let me know if there is any problem with the patch, thanks.

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