18c2ecf20Sopenharmony_cichoice 28c2ecf20Sopenharmony_ci prompt "Choose kernel unwinder" 38c2ecf20Sopenharmony_ci default UNWINDER_PROLOGUE if KALLSYMS 48c2ecf20Sopenharmony_ci help 58c2ecf20Sopenharmony_ci This determines which method will be used for unwinding kernel stack 68c2ecf20Sopenharmony_ci traces for panics, oopses, bugs, warnings, perf, /proc/<pid>/stack, 78c2ecf20Sopenharmony_ci livepatch, lockdep, and more. 88c2ecf20Sopenharmony_ci 98c2ecf20Sopenharmony_ciconfig UNWINDER_GUESS 108c2ecf20Sopenharmony_ci bool "Guess unwinder" 118c2ecf20Sopenharmony_ci help 128c2ecf20Sopenharmony_ci This option enables the "guess" unwinder for unwinding kernel stack 138c2ecf20Sopenharmony_ci traces. It scans the stack and reports every kernel text address it 148c2ecf20Sopenharmony_ci finds. Some of the addresses it reports may be incorrect. 158c2ecf20Sopenharmony_ci 168c2ecf20Sopenharmony_ciconfig UNWINDER_PROLOGUE 178c2ecf20Sopenharmony_ci bool "Prologue unwinder" 188c2ecf20Sopenharmony_ci depends on KALLSYMS 198c2ecf20Sopenharmony_ci help 208c2ecf20Sopenharmony_ci This option enables the "prologue" unwinder for unwinding kernel stack 218c2ecf20Sopenharmony_ci traces. It unwind the stack frame based on prologue code analyze. Symbol 228c2ecf20Sopenharmony_ci information is needed, at least the address and length of each function. 238c2ecf20Sopenharmony_ci Some of the addresses it reports may be incorrect. 248c2ecf20Sopenharmony_ci 258c2ecf20Sopenharmony_ciendchoice 268c2ecf20Sopenharmony_ci 278c2ecf20Sopenharmony_ciconfig DEBUG_ZBOOT 288c2ecf20Sopenharmony_ci bool "Enable compressed kernel support debugging" 298c2ecf20Sopenharmony_ci depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT 308c2ecf20Sopenharmony_ci default n 318c2ecf20Sopenharmony_ci help 328c2ecf20Sopenharmony_ci If you want to add compressed kernel support to a new board, and the 338c2ecf20Sopenharmony_ci board supports uart16550 compatible serial port, please select 348c2ecf20Sopenharmony_ci SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to 358c2ecf20Sopenharmony_ci debug it. 368c2ecf20Sopenharmony_ci 378c2ecf20Sopenharmony_ci If your board doesn't support uart16550 compatible serial port, you 388c2ecf20Sopenharmony_ci can try to select SYS_SUPPORTS_ZBOOT and use the other methods to 398c2ecf20Sopenharmony_ci debug it. for example, add a new serial port support just as 408c2ecf20Sopenharmony_ci arch/loongarch/boot/compressed/uart-16550.c does. 418c2ecf20Sopenharmony_ci 428c2ecf20Sopenharmony_ci After the compressed kernel support works, please disable this option 438c2ecf20Sopenharmony_ci to reduce the kernel image size and speed up the booting procedure a 448c2ecf20Sopenharmony_ci little. 458c2ecf20Sopenharmony_ci 468c2ecf20Sopenharmony_ciconfig SPINLOCK_TEST 478c2ecf20Sopenharmony_ci tristate "Enable spinlock timing tests in debugfs" 488c2ecf20Sopenharmony_ci default n 498c2ecf20Sopenharmony_ci help 508c2ecf20Sopenharmony_ci Add several files to the debugfs to test spinlock speed. 51