Why the kernel I compiled cannot boot?

[dirt2022]

Compile device: an android arm64 device,running chroot debian bookworm

CC=/usr/bin/clang
LD=/usr/bin/LD.lld
At=llvm-ar
(Apt install clang llvm binutils)

cd src
Make O=out pipa_user_defconfig
Make O=out -j$(nproc)
I got out/arch/arm64/boot/Image
And : out/arch/arm64/boot/dts/xxxx.dtbo

Mkdtimg create dtbo.IMG out/arch/arm64/boot/dts/*.dtbo

(I merged the device-tree into the source code.)

mkbootimg boot.IMG --kernel out/arch/arm64/boot/Image --ramdisk /root/unpacked --*** (args from boot.IMG in official firmware)

Here are the results:
Official = O
Custom= C ( built from the source code )

boot successfully=Y
boot unsuccessfully=N (stuck in the MI logo)

| DTBO.IMG | BOOT.IMG | RESULT |
| O | O | Y |
| O | C | N |
| C | O | Y |
| C | C | N |

[dirt2022]

I am using GSI.

Before compiling,I edit the gsi.c
( Or genksyms program cannot version the function:gsi_write_channel_scratch )

static union __packed gsi_channel_scratch __gsi_update_mhi_channel_scratch(
        unsigned long chan_hdl, struct __packed gsi_mhi_channel_scratch mscr)
{

Into

static union gsi_channel_scratch __gsi_update_mhi_channel_scratch(
        unsigned long chan_hdl, struct __packed gsi_mhi_channel_scratch mscr)
{

[liyafe1997]

The pipa kernel has a uninitialized pointer problem, which can cause kernel panic during boot.

[    0.900473] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020
[    0.900477] Mem abort info:
[    0.900480]   ESR = 0x96000005
[    0.900483]   Exception class = DABT (current EL), IL - 32 bitq
[    0.900485]   SET = 0, FnV = 0
[    0.900488]   EA = 0, S1PTW = 0
[    0.900490] Data abort info:
[    0.900492]   ISV = 0, ISS = 0x00000005
[    0.900495]   CM = 0, WnR = 0
[    0.900498] [0000000000000020] user address but active_mm is swapper
[    0.900503] Internal error: Oops: 96000005 [#1] PREEMPT SMP
[    0.900509] Modules linked in:
[    0.900513] Process swapper/0 (pid: 1, stack limit = 0x000000002d949a78)
[    0.900508\ CPU: 4 PID: 1 Comm: swapper/0 Tainted: G S                4.19.318-perf+ #1
[    0.900521] Hardware name: Qualcomm Technologies, Inc. xiaomi pipa (DT)
[    0.900524] pstate: 00c00005 (nzcv daif +PAN +UAO)
[    0.900538] pc : bq2597x_charger_probe+0x44/0xe3c
[    0.900552] lr : i2c_device_probe+0x230/0x278
[    0.900555] sp : ffffff800805ba60
[    0.900557] x29: ffffff800805ba70 x28: 0000000000000000 
[    0.900560] x27: 0000000000000000 x26: 0000000000000000 
[    0.900563] x25: 0000000000000000 x24: ffffffa26c125028 
[    0.900566] x23: ffffffa26a2116e0 x22: ffffffcb3746b404 
[    0.900568] x21: ffffffa26b43ecf0 x20: ffffffcb3746b400 
[    0.900571] x19: ffffffcb3746b420 x18: 0000000000000000 
[    0.900574] x17: ffffff800805b800 x16: 0000000000000010 
[    0.900576] x15: ffffffa26aeee488 x14: 0000000000003334 
[    0.900579] x13: ffffff800805b3c2 x12: 0000000000000001 
[    0.900582] x11: ffffffa26bb58b5b x10: ffffffa26bb58ba1 
[    0.900584] x9 : 0000000000000020 x8 : 5ea38723ee3fcf00 
[    0.900587] x7 : feff646d6e6b6063 x6 : 0000000000008080 
[    0.900590] x5 : 0000000000000000 x4 : 8080000000000000 
[    0.900592] x3 : 0000000000000000 x2 : 0000000000000000 
[    0.900595] x1 : ffffffa26bb58b8b x0 : ffffffcb3746b400 
[    0.900599] Call trace:
[    0.900602]  bq2597x_charger_probe+0x44/0xe3c
[    0.900605]  i2c_device_probe+0x230/0x278
[    0.900614]  really_probe+0x270/0x2f4
[    0.900617]  driver_probe_device+0x60/0xf8
[    0.900620]  __driver_attach+0xe0/0x118
[    0.900623]  bus_for_each_dev+0x7c/0xc4
[    0.900626]  driver_attach+0x20/0x28
[    0.900629]  bus_add_driver+0x11c/0x1fc
[    0.900633]  driver_register+0x74/0x108
[    0.900636]  i2c_register_driver+0x3c/0x9c
[    0.900644]  bq2597x_charger_driver_init+0x18/0x20
[    0.900650]  do_one_initcall+0x180/0x2dc
[    0.900656]  do_initcall_level+0x140/0x168
[    0.900659]  do_basic_setup+0x30/0x48
[    0.900662]  kernel_init_freeable+0xb8/0x138
[    0.900668]  kernel_init+0x14/0x28c
[    0.900671]  ret_from_fork+0x10/0x18
[     .900675\ Code: aa0003f4 f000ca21 912e2c21 f90007e8 (b9400128) 
[    0.900681] ---[ end traCe 4fb713f1eefedda& ]---
[    0.900703] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

The fix:
#27861