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    Subject[tip:sched/rt] x86/dumpstack: Indicate PREEMPT_RT in dumps
    Commit-ID:  cb376c26971ff54f25980ec1f0ae2f06d6a69df0
    Gitweb: https://git.kernel.org/tip/cb376c26971ff54f25980ec1f0ae2f06d6a69df0
    Author: Thomas Gleixner <tglx@linutronix.de>
    AuthorDate: Fri, 26 Jul 2019 23:19:43 +0200
    Committer: Ingo Molnar <mingo@kernel.org>
    CommitDate: Wed, 31 Jul 2019 19:03:36 +0200

    x86/dumpstack: Indicate PREEMPT_RT in dumps

    Stack dumps print whether the kernel has preemption enabled or not. Extend
    it so a PREEMPT_RT enabled kernel can be identified.

    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Masami Hiramatsu <mhiramat@kernel.org>
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Cc: Paul E. McKenney <paulmck@linux.ibm.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Link: http://lkml.kernel.org/r/20190726212124.699136351@linutronix.de
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    ---
    arch/x86/kernel/dumpstack.c | 7 ++++++-
    1 file changed, 6 insertions(+), 1 deletion(-)

    diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
    index 2b5886401e5f..e07424e19274 100644
    --- a/arch/x86/kernel/dumpstack.c
    +++ b/arch/x86/kernel/dumpstack.c
    @@ -367,13 +367,18 @@ NOKPROBE_SYMBOL(oops_end);

    int __die(const char *str, struct pt_regs *regs, long err)
    {
    + const char *pr = "";
    +
    /* Save the regs of the first oops for the executive summary later. */
    if (!die_counter)
    exec_summary_regs = *regs;

    + if (IS_ENABLED(CONFIG_PREEMPTION))
    + pr = IS_ENABLED(CONFIG_PREEMPT_RT) ? " PREEMPT_RT" : " PREEMPT";
    +
    printk(KERN_DEFAULT
    "%s: %04lx [#%d]%s%s%s%s%s\n", str, err & 0xffff, ++die_counter,
    - IS_ENABLED(CONFIG_PREEMPT) ? " PREEMPT" : "",
    + pr,
    IS_ENABLED(CONFIG_SMP) ? " SMP" : "",
    debug_pagealloc_enabled() ? " DEBUG_PAGEALLOC" : "",
    IS_ENABLED(CONFIG_KASAN) ? " KASAN" : "",
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