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    Subject[PATCH 3/3] Initialize and use trec_snapshot and trec_print_snapshot.
    Date
    Trec's are initialized early in main.c and then dump
    trec's in die(), panic() and do_page_fault().

    Signed-off-by: Wink Saville <wink@saville.com>
    ---
    arch/x86_64/kernel/traps.c | 5 +++++
    arch/x86_64/mm/fault.c | 6 ++++++
    init/main.c | 4 ++++
    kernel/panic.c | 5 +++++
    4 files changed, 20 insertions(+), 0 deletions(-)

    diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
    index 09d2e8a..b4f1a36 100644
    --- a/arch/x86_64/kernel/traps.c
    +++ b/arch/x86_64/kernel/traps.c
    @@ -32,6 +32,7 @@
    #include <linux/unwind.h>
    #include <linux/uaccess.h>
    #include <linux/bug.h>
    +#include <linux/trec.h>

    #include <asm/system.h>
    #include <asm/io.h>
    @@ -547,9 +548,13 @@ void die(const char * str, struct pt_regs * regs, long err)
    {
    unsigned long flags = oops_begin();

    + trec_snapshot();
    +
    if (!user_mode(regs))
    report_bug(regs->rip);

    + trec_print_snapshot();
    +
    __die(str, regs, err);
    oops_end(flags);
    do_exit(SIGSEGV);
    diff --git a/arch/x86_64/mm/fault.c b/arch/x86_64/mm/fault.c
    index 6ada723..e92f6bc 100644
    --- a/arch/x86_64/mm/fault.c
    +++ b/arch/x86_64/mm/fault.c
    @@ -24,6 +24,7 @@
    #include <linux/module.h>
    #include <linux/kprobes.h>
    #include <linux/uaccess.h>
    +#include <linux/trec.h>

    #include <asm/system.h>
    #include <asm/pgalloc.h>
    @@ -535,6 +536,8 @@ no_context:

    flags = oops_begin();

    + trec_snapshot();
    +
    if (address < PAGE_SIZE)
    printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
    else
    @@ -548,6 +551,9 @@ no_context:
    __die("Oops", regs, error_code);
    /* Executive summary in case the body of the oops scrolled away */
    printk(KERN_EMERG "CR2: %016lx\n", address);
    +
    + trec_print_snapshot();
    +
    oops_end(flags);
    do_exit(SIGKILL);

    diff --git a/init/main.c b/init/main.c
    index a92989e..46bc440 100644
    --- a/init/main.c
    +++ b/init/main.c
    @@ -54,6 +54,7 @@
    #include <linux/lockdep.h>
    #include <linux/pid_namespace.h>
    #include <linux/device.h>
    +#include <linux/trec.h>

    #include <asm/io.h>
    #include <asm/bugs.h>
    @@ -517,6 +518,9 @@ asmlinkage void __init start_kernel(void)
    early_boot_irqs_off();
    early_init_irq_lock_class();

    + trec_init();
    + TREC0();
    +
    /*
    * Interrupts are still disabled. Do necessary setups, then
    * enable them
    diff --git a/kernel/panic.c b/kernel/panic.c
    index 623d182..52812f2 100644
    --- a/kernel/panic.c
    +++ b/kernel/panic.c
    @@ -19,6 +19,7 @@
    #include <linux/nmi.h>
    #include <linux/kexec.h>
    #include <linux/debug_locks.h>
    +#include <linux/trec.h>

    int panic_on_oops;
    int tainted;
    @@ -66,6 +67,8 @@ NORET_TYPE void panic(const char * fmt, ...)
    unsigned long caller = (unsigned long) __builtin_return_address(0);
    #endif

    + trec_snapshot();
    +
    /*
    * It's possible to come here directly from a panic-assertion and not
    * have preempt disabled. Some functions called from here want
    @@ -96,6 +99,8 @@ NORET_TYPE void panic(const char * fmt, ...)
    smp_send_stop();
    #endif

    + trec_print_snapshot();
    +
    atomic_notifier_call_chain(&panic_notifier_list, 0, buf);

    if (!panic_blink)
    --
    1.5.0.rc2
    -
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