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    SubjectRe: [Devel] Re: [PATCH 08/10] Introduce functions to restart a process
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    On Monday 20 October 2008 13:23 Cedric Le Goater wrote:
    > Hello Andrey !
    >
    > > diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
    > > index 109792b..a4848a3 100644
    > > --- a/arch/x86/kernel/entry_32.S
    > > +++ b/arch/x86/kernel/entry_32.S
    > > @@ -225,6 +225,7 @@ ENTRY(ret_from_fork)
    > > GET_THREAD_INFO(%ebp)
    > > popl %eax
    > > CFI_ADJUST_CFA_OFFSET -4
    > > +ret_from_fork_tail:
    > > pushl $0x0202 # Reset kernel eflags
    > > CFI_ADJUST_CFA_OFFSET 4
    > > popfl
    > > @@ -233,6 +234,26 @@ ENTRY(ret_from_fork)
    > > CFI_ENDPROC
    > > END(ret_from_fork)
    > >
    > > +ENTRY(i386_ret_from_resume)
    > > + CFI_STARTPROC
    > > + pushl %eax
    > > + CFI_ADJUST_CFA_OFFSET 4
    > > + call schedule_tail
    > > + GET_THREAD_INFO(%ebp)
    > > + popl %eax
    > > + CFI_ADJUST_CFA_OFFSET -4
    > > + movl (%esp), %eax
    > > + testl %eax, %eax
    > > + jz 1f
    > > + pushl %esp
    > > + call *%eax
    > > + addl $4, %esp
    > > +1:
    > > + addl $256, %esp
    > > + jmp ret_from_fork_tail
    > > + CFI_ENDPROC
    > > +END(i386_ret_from_resume)
    >
    > Could you explain why you need to do this
    >
    > call *%eax
    >
    > is it related to the freezer code ?

    It is not related to the freezer code actually.
    That is needed to restart syscalls. Right now I don't have a code in my
    patchset which restarts a syscall, but later I plan to add it.
    In OpenVZ checkpointing we restart syscalls if process was caught in syscall
    during checkpointing.

    Andrey


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