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i) Create kmemleak.cfg file under meta-cmf-raspberrypi/recipes-kernel/linux/files with below kernel configs.
Note: Need to add this change in corresponding Platform OEM layer.

ii) Add kmemleak.cfg file  in meta-cmf-raspberrypi/recipes-kernel/linux/linux-raspberrypi_5.10.52.bb 
Note: Need to add this change in corresponding Platform OEM layer.

Please find below diff file.
Ex:

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iii) Once build done with above changes, verify the  kernel configs are enabled in final kernel boot config file.
Path of kernel boot config file:  build-raspberrypi-rdk-mc/tmp/work/raspberrypi_rdk_mc-rdk-linux-gnueabi/linux-raspberrypi/1_5.10.52+gitAUTOINC+dbe03fa900_2697f74031-r0/image/boot/config-5.10.52-v7
Note: Need to verify in corresponding platform specific final kernel boot config file

Ex:

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Note: kmemleak-test.ko by default in rpi3 this module not compiled , there is no kmemleak-test.ko module , so enable to build as a module and generated module file.
kmemleak-test.ko

Note: Need to generate kmemleak-test.ko module file from corresponding platform specific kernel source code.

Step 1 : Copy kmemleak-test.ko module to this path /lib/modules/5.10.52-v7/  in box .
Step 2 : load the module to kernel space with insmod command.
Ex:

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