Add log level argument to show_stack(). Done in three stages: 1. Introducing show_stack_loglvl() for every architecture 2. Migrating old users with an explicit log level 3. Renaming show_stack_loglvl() into show_stack() Justification: o It's a design mistake to move a business-logic decision into platform realization detail. o I have currently two patches sets that would benefit from this work: Removing console_loglevel jumps in sysrq driver [1] Hung task warning before panic [2] - suggested by Tetsuo (but he probably didn't realise what it would involve). o While doing (1), (2) the backtraces were adjusted to headers and other messages for each situation - so there won't be a situation when the backtrace is printed, but the headers are missing because they have lesser log level (or the reverse). o As the result in (2) plays with console_loglevel for kdb are removed. The least important for upstream, but maybe still worth to note that every company I've worked in so far had an off-list patch to print backtrace with the needed log level (but only for the architecture they cared about). If you have other ideas how you will benefit from show_stack() with a log level - please, reply to this cover letter. Ok, to the scary part: I've tested it on x86_64 and build tested on a couple of architectures. Though, I can't cover all platforms so I hope I'll have a couple of reports and than it'll soak in linux-next for some time. In my opinion the variety of architectures shouldn't stop general improvements. Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Jiri Slaby <jslaby@xxxxxxxx> Cc: Petr Mladek <pmladek@xxxxxxxx> Cc: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> Thanks, Dmitry [1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@xxxxxxxxxx/T/#u [2]: https://lkml.kernel.org/r/41fd7652-df1f-26f6-aba0-b87ebae07db6@xxxxxxxxxxxxxxxxxxx Dmitry Safonov (50): kallsyms/printk: Add loglvl to print_ip_sym() alpha: Add show_stack_loglvl() arc: Add show_stack_loglvl() arm/asm: Add loglvl to c_backtrace() arm: Add loglvl to unwind_backtrace() arm: Add loglvl to dump_backtrace() arm: Wire up dump_backtrace_{entry,stm} arm: Add show_stack_loglvl() arm64: Add loglvl to dump_backtrace() arm64: Add show_stack_loglvl() c6x: Add show_stack_loglvl() csky: Add show_stack_loglvl() h8300: Add show_stack_loglvl() hexagon: Add show_stack_loglvl() ia64: Pass log level as arg into ia64_do_show_stack() ia64: Add show_stack_loglvl() m68k: Add show_stack_loglvl() microblaze: Add loglvl to microblaze_unwind_inner() microblaze: Add loglvl to microblaze_unwind() microblaze: Add show_stack_loglvl() mips: Add show_stack_loglvl() nds32: Add show_stack_loglvl() nios2: Add show_stack_loglvl() openrisc: Add show_stack_loglvl() parisc: Add show_stack_loglvl() powerpc: Add show_stack_loglvl() riscv: Add show_stack_loglvl() s390: Add show_stack_loglvl() sh: Add loglvl to dump_mem() sh: Remove needless printk() sh: Add loglvl to printk_address() sh: Add loglvl to show_trace() sh: Add show_stack_loglvl() sparc: Add show_stack_loglvl() um/sysrq: Remove needless variable sp um: Add show_stack_loglvl() unicore32: Remove unused pmode argument in c_backtrace() unicore32: Add loglvl to c_backtrace() unicore32: Add show_stack_loglvl() x86: Add missing const qualifiers for log_lvl x86: Add show_stack_loglvl() xtensa: Add loglvl to show_trace() xtensa: Add show_stack_loglvl() sysrq: Use show_stack_loglvl() x86/amd_gart: Print stacktrace for a leak with KERN_ERR power: Use show_stack_loglvl() kdb: Don't play with console_loglevel sched: Print stack trace with KERN_INFO kernel: Use show_stack_loglvl() kernel: Rename show_stack_loglvl() => show_stack() arch/alpha/kernel/traps.c | 22 +++++++-------- arch/arc/include/asm/bug.h | 3 ++- arch/arc/kernel/stacktrace.c | 17 +++++++----- arch/arc/kernel/troubleshoot.c | 2 +- arch/arm/include/asm/bug.h | 3 ++- arch/arm/include/asm/traps.h | 3 ++- arch/arm/include/asm/unwind.h | 3 ++- arch/arm/kernel/traps.c | 40 ++++++++++++++++------------ arch/arm/kernel/unwind.c | 7 ++--- arch/arm/lib/backtrace-clang.S | 9 +++++-- arch/arm/lib/backtrace.S | 14 +++++++--- arch/arm64/include/asm/stacktrace.h | 3 ++- arch/arm64/kernel/process.c | 2 +- arch/arm64/kernel/traps.c | 19 ++++++------- arch/c6x/kernel/traps.c | 18 +++++++------ arch/csky/kernel/dumpstack.c | 9 ++++--- arch/csky/kernel/ptrace.c | 4 +-- arch/h8300/kernel/traps.c | 12 ++++----- arch/hexagon/kernel/traps.c | 25 ++++++++--------- arch/ia64/include/asm/ptrace.h | 1 - arch/ia64/kernel/mca.c | 2 +- arch/ia64/kernel/process.c | 17 ++++++------ arch/m68k/kernel/traps.c | 13 ++++----- arch/microblaze/include/asm/unwind.h | 3 ++- arch/microblaze/kernel/stacktrace.c | 4 +-- arch/microblaze/kernel/traps.c | 12 ++++----- arch/microblaze/kernel/unwind.c | 37 ++++++++++++++----------- arch/mips/kernel/traps.c | 35 ++++++++++++------------ arch/nds32/kernel/traps.c | 15 ++++++----- arch/nios2/kernel/traps.c | 17 ++++++------ arch/openrisc/kernel/traps.c | 12 +++++---- arch/parisc/kernel/traps.c | 24 ++++++++--------- arch/powerpc/kernel/process.c | 15 ++++++----- arch/powerpc/kernel/stacktrace.c | 2 +- arch/riscv/kernel/stacktrace.c | 9 ++++--- arch/s390/kernel/dumpstack.c | 11 ++++---- arch/sh/include/asm/kdebug.h | 6 +++-- arch/sh/include/asm/processor_32.h | 2 +- arch/sh/kernel/dumpstack.c | 36 ++++++++++++------------- arch/sh/kernel/process_32.c | 2 +- arch/sh/kernel/process_64.c | 3 +-- arch/sh/kernel/traps.c | 4 +-- arch/sh/mm/fault.c | 2 +- arch/sparc/kernel/process_32.c | 10 +++---- arch/sparc/kernel/process_64.c | 2 +- arch/um/drivers/mconsole_kern.c | 2 +- arch/um/kernel/sysrq.c | 23 ++++++++-------- arch/unicore32/kernel/setup.h | 2 +- arch/unicore32/kernel/traps.c | 34 +++++++++++------------ arch/unicore32/lib/backtrace.S | 24 +++++++++++------ arch/x86/include/asm/stacktrace.h | 2 +- arch/x86/kernel/amd_gart_64.c | 2 +- arch/x86/kernel/dumpstack.c | 9 ++++--- arch/xtensa/kernel/traps.c | 26 ++++++++++-------- drivers/base/power/main.c | 2 +- drivers/tty/sysrq.c | 2 +- include/linux/kallsyms.h | 4 +-- include/linux/sched/debug.h | 3 ++- kernel/debug/kdb/kdb_bt.c | 11 +++----- kernel/locking/lockdep.c | 4 +-- kernel/locking/rtmutex-debug.c | 2 +- kernel/sched/core.c | 6 ++--- kernel/trace/ftrace.c | 8 +++--- lib/dump_stack.c | 2 +- 64 files changed, 368 insertions(+), 311 deletions(-) -- 2.23.0 _______________________________________________ linux-snps-arc mailing list linux-snps-arc@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/linux-snps-arc
