September 26, 2022

The Best Way To Remove The Linux Kernel Is To Check The Atomic Context.

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    If you have a linux kernel that checks for atomic context on your PC, I hope this article helps you.

    I am publishing a kernel module in which I use some functionality that will be used by other modules that I have modified. When testing a pile system. I’m getting an error while “scheduling, they are atomic”. Debugging,

    linux kernel check atomic context

    after realizing that normally the system crashes when calling meaningful atomic_set(). Does this mean I am atomically calling a function from a non-atomic function? i can’t run atomic_set() cas? Q What should I use instead?

    Also, as I’ve already announced, I’ve modified some of the original kernel sends to call my function. How do I know if my work is atomic code or not?

    my_callback(svc, skb);
    int my_callback(struct ip_vs_service *svc, struct sk_buff *skb)        int sto;        printk(KERN_INFO"Call by name n");        swto is equal to swtoing(svc);        go back;

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  • My swtoing() helper is a bit long, but I did a lot of debugging and found that the system can’t crash if I find a better line in swtoing() with the actual atomic_set()

    linux kernel check atomic context

    I’ve noticed that the parts of the cores I’m modifying are COMPLETELY pointing to spin_locks and such… So (forgive me if I’m wrong) I make a mandatory product in functions that i create to support this nested/atomic stuff… i don’t know what 🙁

    From:Leonidas.
    Date of: Wednesday, October 14, 2009 6:26:17 am EST.

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  • In response to: Gleb Natapov: “Re: How are companies to check if they are in an atomic context?”
  • Further in the topic: Stefan Richter: “Re: How is execution checked in a fischer context?”
  • Messages sorted by: Date] [ [ thorough topic ] [ topic ] [ article author ]
  • On Wednesday, October 14, 2010 at 03:13 Gleb Natapov wrote:
    > On Wednesday 14 October 2011 at 2:21:22 -07:00 Leonidas wrote:
    >> 13.10.2009 23:36 Leonidas. . . . wrote:
    >>> Hello >
    >> list,
    >> > I’m working on the right profiler module, my
    >>> Module can be
    >> Called > from both the process context and the interrupt context. According > Found
    >>Context I’m in, I need hibernates hibernates/not options
    >>> internal
    >> my functions > management.
    >> >
    >> > I know an in_interrupt() call that can be used to test the Werden thread
    >> Basic conditions > and which measures need to be taken
    >> > respectively.
    >> >
    >> > There are many APIs that can help you find out if > we are working
    >> while maintaining the spinlock? i.e
    >> > a specific API that can help simulate a sleeping/non-sleeping context? this
    >> if > should not be, because what can
    >> > execute at the same time as writing? Any helpful advice would be helpful.
    >> >
    >> > -left.>
    >>
    >>
    >>When I was probably looking for sources I found this,
    >>
    >> 97/*
    >> 98 * Are we supposed to use atomic WARNING! context? Some macros cannot do this.
    >> 99 * always learn atomic context; in particular, he knows nothing about it
    >> 100* are considered spinlocks in non-preemptive nuclei. So it really shouldn’t be
    >> 101 * is used generally to determine if sleep is possible.
    >> 102 * Do not use In_atomic() in the swap driver.
    >> 103 104#define */
    >> in_atomic() & ((preempt_count() ~PREEMPT_ACTIVE) !=
    >> PREEMPT_INATOMIC_BASE)
    >> 105
    >>
    >> that complicates things, doesn’t it? Doesn’t work with common
    >> case, but I think that’s what it is
    >> will definitely always work when the kernel is likely to be preemptive.
    >>
    >> it is impossible Whether to write the general macro TO?
    >>
    >>
    > The patch added make in_atomic() to build the kernel without preemption.
    > Doesn’t look nice or scary.
    >
    > checked only by 64bit kvm guest, right, no more overload. Signed
    >
    > author: Gleb Natapov Diff
    > A/include/linux/hardirq –git.h b/include/linux/hardirq.h
    > Index 6d527ee..a6b6040 100644
    >— a/include/linux/hardirq.h
    > +++ b/include/linux/hardirq.h
    > @@ -92.12 +92.11 @@
    > BUT */
    > #define in_nmi() (preempt_count() and NMI_MASK)
    >
    > +#define PREEMPT_CHECK_OFFSET 1
    > #if defined (CONFIG_PREEMPT)
    > # set PREEMPT_INATOMIC_BASE kernel_locked()
    > -# Set PREEMPT_CHECK_OFFSET 1
    > # else
    > # set PREEMPT_INATOMIC_BASE 0
    > -# Form PREEMPT_CHECK_OFFSET 0
    > #endif
    >
    > BUT /*
    > @@ -116.12 +115.11 @@
    > #define in_atomic_preempt_off() n
    > ((preempt_count() & ~PREEMPT_ACTIVE) != +#define preempt_check_offset)
    >
    > (HARDIRQ_OFFSET-1)
    > irq_exit_offset #ifdef CONFIG_PREEMPT
    > # set without ambiguity preemptible() (preempt_count() == 0 && !irqs_disabled())
    > -# set (HARDIRQ_OFFSET-1)
    > irq_exit_offset #more
    > # lookahead() definition 0
    > -# define IRQ_EXIT_OFFSET HARDIRQ_OFFSET
    > #endif
    >
    > #if set(CONFIG_SMP) || defined (CONFIG_GENERIC_HARDIRQS)
    > diff –git a/include/linux/preempt.h b/include/linux/preempt.h
    > List 72b1a10..7d039ca 100644
    > — a/include/linux/preempt.h
    > +++ b/include/linux/preempt.h
    > @@ -82.14 +82.24 do @@ n
    >
    > { -#define #else
    >
    > preempt_disable() do if (0)
    > preempt_enable_no_resched() -#define do while (0)

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