The patch titled Subject: mips: add show_stack_loglvl() has been added to the -mm tree. Its filename is mips-add-show_stack_loglvl.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mips-add-show_stack_loglvl.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/mips-add-show_stack_loglvl.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Dmitry Safonov <dima@xxxxxxxxxx> Subject: mips: add show_stack_loglvl() Currently, the log-level of show_stack() depends on a platform realization. It creates situations where the headers are printed with lower log level or higher than the stacktrace (depending on a platform or user). Furthermore, it forces the logic decision from user to an architecture side. In result, some users as sysrq/kdb/etc are doing tricks with temporary rising console_loglevel while printing their messages. And in result it not only may print unwanted messages from other CPUs, but also omit printing at all in the unlucky case where the printk() was deferred. Introducing log-level parameter and KERN_UNSUPPRESSED [1] seems an easier approach than introducing more printk buffers. Also, it will consolidate printings with headers. Introduce show_stack_loglvl(), that eventually will substitute show_stack(). [1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@xxxxxxxxxx/T/#u Link: http://lkml.kernel.org/r/20200418201944.482088-22-dima@xxxxxxxxxx Signed-off-by: Dmitry Safonov <dima@xxxxxxxxxx> Cc: James Hogan <jhogan@xxxxxxxxxx> Cc: Paul Burton <paulburton@xxxxxxxxxx> Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/mips/kernel/traps.c | 41 +++++++++++++++++++++---------------- 1 file changed, 24 insertions(+), 17 deletions(-) --- a/arch/mips/kernel/traps.c~mips-add-show_stack_loglvl +++ a/arch/mips/kernel/traps.c @@ -106,26 +106,26 @@ void (*board_bind_eic_interrupt)(int irq void (*board_ebase_setup)(void); void(*board_cache_error_setup)(void); -static void show_raw_backtrace(unsigned long reg29) +static void show_raw_backtrace(unsigned long reg29, const char *loglvl) { unsigned long *sp = (unsigned long *)(reg29 & ~3); unsigned long addr; - printk("Call Trace:"); + printk("%sCall Trace:", loglvl); #ifdef CONFIG_KALLSYMS - printk("\n"); + printk("%s\n", loglvl); #endif while (!kstack_end(sp)) { unsigned long __user *p = (unsigned long __user *)(unsigned long)sp++; if (__get_user(addr, p)) { - printk(" (Bad stack address)"); + printk("%s (Bad stack address)", loglvl); break; } if (__kernel_text_address(addr)) - print_ip_sym(KERN_DEFAULT, addr); + print_ip_sym(loglvl, addr); } - printk("\n"); + printk("%s\n", loglvl); } #ifdef CONFIG_KALLSYMS @@ -138,7 +138,8 @@ static int __init set_raw_show_trace(cha __setup("raw_show_trace", set_raw_show_trace); #endif -static void show_backtrace(struct task_struct *task, const struct pt_regs *regs) +static void show_backtrace(struct task_struct *task, const struct pt_regs *regs, + const char *loglvl) { unsigned long sp = regs->regs[29]; unsigned long ra = regs->regs[31]; @@ -148,12 +149,12 @@ static void show_backtrace(struct task_s task = current; if (raw_show_trace || user_mode(regs) || !__kernel_text_address(pc)) { - show_raw_backtrace(sp); + show_raw_backtrace(sp, loglvl); return; } - printk("Call Trace:\n"); + printk("%sCall Trace:\n", loglvl); do { - print_ip_sym(KERN_DEFAULT, pc); + print_ip_sym(loglvl, pc); pc = unwind_stack(task, &sp, pc, &ra); } while (pc); pr_cont("\n"); @@ -164,19 +165,19 @@ static void show_backtrace(struct task_s * with at least a bit of error checking ... */ static void show_stacktrace(struct task_struct *task, - const struct pt_regs *regs) + const struct pt_regs *regs, const char *loglvl) { const int field = 2 * sizeof(unsigned long); long stackdata; int i; unsigned long __user *sp = (unsigned long __user *)regs->regs[29]; - printk("Stack :"); + printk("%sStack :", loglvl); i = 0; while ((unsigned long) sp & (PAGE_SIZE - 1)) { if (i && ((i % (64 / field)) == 0)) { pr_cont("\n"); - printk(" "); + printk("%s ", loglvl); } if (i > 39) { pr_cont(" ..."); @@ -192,10 +193,11 @@ static void show_stacktrace(struct task_ i++; } pr_cont("\n"); - show_backtrace(task, regs); + show_backtrace(task, regs, loglvl); } -void show_stack(struct task_struct *task, unsigned long *sp) +void show_stack_loglvl(struct task_struct *task, unsigned long *sp, + const char *loglvl) { struct pt_regs regs; mm_segment_t old_fs = get_fs(); @@ -219,10 +221,15 @@ void show_stack(struct task_struct *task * the stack in the kernel (not user) address space. */ set_fs(KERNEL_DS); - show_stacktrace(task, ®s); + show_stacktrace(task, ®s, loglvl); set_fs(old_fs); } +void show_stack(struct task_struct *task, unsigned long *sp) +{ + show_stack_loglvl(task, sp, KERN_DEFAULT) +} + static void show_code(unsigned int __user *pc) { long i; @@ -371,7 +378,7 @@ void show_registers(struct pt_regs *regs if (!user_mode(regs)) /* Necessary for getting the correct stack content */ set_fs(KERNEL_DS); - show_stacktrace(current, regs); + show_stacktrace(current, regs, KERN_DEFAULT); show_code((unsigned int __user *) regs->cp0_epc); printk("\n"); set_fs(old_fs); _ Patches currently in -mm which might be from dima@xxxxxxxxxx are kallsyms-printk-add-loglvl-to-print_ip_sym.patch alpha-add-show_stack_loglvl.patch arc-add-show_stack_loglvl.patch arm-asm-add-loglvl-to-c_backtrace.patch arm-add-loglvl-to-unwind_backtrace.patch arm-add-loglvl-to-dump_backtrace.patch arm-wire-up-dump_backtrace_entrystm.patch arm-add-show_stack_loglvl.patch arm64-add-loglvl-to-dump_backtrace.patch arm64-add-show_stack_loglvl.patch c6x-add-show_stack_loglvl.patch csky-add-show_stack_loglvl.patch h8300-add-show_stack_loglvl.patch hexagon-add-show_stack_loglvl.patch ia64-pass-log-level-as-arg-into-ia64_do_show_stack.patch ia64-add-show_stack_loglvl.patch m68k-add-show_stack_loglvl.patch microblaze-add-loglvl-to-microblaze_unwind_inner.patch microblaze-add-loglvl-to-microblaze_unwind.patch microblaze-add-show_stack_loglvl.patch mips-add-show_stack_loglvl.patch nds32-add-show_stack_loglvl.patch nios2-add-show_stack_loglvl.patch openrisc-add-show_stack_loglvl.patch parisc-add-show_stack_loglvl.patch powerpc-add-show_stack_loglvl.patch riscv-add-show_stack_loglvl.patch s390-add-show_stack_loglvl.patch sh-add-loglvl-to-dump_mem.patch sh-remove-needless-printk.patch sh-add-loglvl-to-printk_address.patch sh-add-loglvl-to-show_trace.patch sh-add-show_stack_loglvl.patch sparc-add-show_stack_loglvl.patch um-sysrq-remove-needless-variable-sp.patch um-add-show_stack_loglvl.patch unicore32-remove-unused-pmode-argument-in-c_backtrace.patch unicore32-add-loglvl-to-c_backtrace.patch unicore32-add-show_stack_loglvl.patch x86-add-missing-const-qualifiers-for-log_lvl.patch x86-add-show_stack_loglvl.patch xtensa-add-loglvl-to-show_trace.patch xtensa-add-show_stack_loglvl.patch sysrq-use-show_stack_loglvl.patch x86-amd_gart-print-stacktrace-for-a-leak-with-kern_err.patch power-use-show_stack_loglvl.patch kdb-dont-play-with-console_loglevel.patch sched-print-stack-trace-with-kern_info.patch kernel-use-show_stack_loglvl.patch kernel-rename-show_stack_loglvl-=-show_stack.patch