On Mon, Mar 23, 2026 at 12:48:55PM -0400, Sasha Levin wrote: > Building on the lineinfo series, this adds typed function parameter
hi, could you please specify the exact tree/commit and point to the series this patchset is based on? thanks, jirka > display to oops and WARN dumps. A build-time tool extracts parameter > names and types from DWARF, and the kernel maps pt_regs to the calling > convention at crash time. When BTF is available, struct pointer > parameters are dereferenced and their members displayed. > > Example output from a WARN in a function receiving struct new_utsname * > (kernel version info) and struct file * parameters: > > ------------[ cut here ]------------ > WARNING: drivers/tty/sysrq.c:1209 at demo_crash+0xf/0x20 > (drivers/tty/sysrq.c:1209) > CPU: 2 UID: 0 PID: 323 Comm: bash > RIP: 0010:demo_crash+0xf/0x20 (drivers/tty/sysrq.c:1209) > ... > RDI: ffffffffb8ca8d00 > RSI: ffffa0a3c250acc0 > ... > Function parameters (paraminfo_demo_crash): > uts (struct new_utsname *) = 0xffffffffb8ca8d00 > .sysname = "Linux" .nodename = "localhost" > .release = "7.0.0-rc2-00006-g3190..." .version = "#45 SMP PRE" > file (struct file * ) = 0xffffa0a3c250acc0 > .f_mode = (fmode_t)67993630 .f_op = (struct file_operations > *)0xffffffffb7237620 > .f_flags = (unsigned int)32769 .f_cred = (struct cred > *)0xffffa0a3c2e06a80 > .dentry = (struct dentry *)0xffffa0a3c0978cc0 > .prev_pos = (loff_t)-1 > Call Trace: > <TASK> > write_sysrq_trigger+0x96/0xb0 (drivers/tty/sysrq.c:1222) > proc_reg_write+0x54/0xa0 (fs/proc/inode.c:330) > vfs_write+0xc9/0x480 (fs/read_write.c:686) > ksys_write+0x6e/0xe0 (fs/read_write.c:738) > do_syscall_64+0xe2/0x570 (arch/x86/entry/syscall_64.c:62) > entry_SYSCALL_64_after_hwframe+0x77/0x7f (arch/x86/entry/entry_64.S:121) > > Patch 1 adds the core paraminfo infrastructure (DWARF extraction, > kernel-side lookup, register-to-parameter mapping, ~1-2 MB overhead). > Patch 2 adds optional BTF-based struct rendering, gated behind > CONFIG_KALLSYMS_PARAMINFO_BTF. > > Sasha Levin (2): > kallsyms: show function parameter info in oops/WARN dumps > kallsyms: add BTF-based deep parameter rendering in oops dumps > > .../admin-guide/kallsyms-lineinfo.rst | 31 + > arch/x86/kernel/dumpstack.c | 6 +- > include/linux/kallsyms.h | 9 + > init/Kconfig | 40 ++ > kernel/Makefile | 1 + > kernel/kallsyms.c | 182 ++++++ > kernel/kallsyms_internal.h | 6 + > kernel/kallsyms_paraminfo_btf.c | 199 ++++++ > lib/Kconfig.debug | 11 + > lib/tests/Makefile | 3 + > lib/tests/paraminfo_kunit.c | 249 ++++++++ > scripts/Makefile | 3 + > scripts/empty_paraminfo.S | 18 + > scripts/gen_paraminfo.c | 597 ++++++++++++++++++ > scripts/link-vmlinux.sh | 44 +- > 15 files changed, 1393 insertions(+), 6 deletions(-) > create mode 100644 kernel/kallsyms_paraminfo_btf.c > create mode 100644 lib/tests/paraminfo_kunit.c > create mode 100644 scripts/empty_paraminfo.S > create mode 100644 scripts/gen_paraminfo.c > > -- > 2.51.0 > >
