| Date | Thu, 5 Jun 2014 17:56:03 +0800 | From | WANG Chao <> | Subject | Re: [PATCH 06/13] kexec: New syscall kexec_file_load() declaration |
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On 06/03/14 at 09:06am, Vivek Goyal wrote: > This is the new syscall kexec_file_load() declaration/interface. I have > reserved the syscall number only for x86_64 so far. Other architectures > (including i386) can reserve syscall number when they enable the support > for this new syscall.
Hi, Vivek
I have a comment below about the kexec_file_load args.
[..] > diff --git a/kernel/kexec.c b/kernel/kexec.c > index c435c5f..a3044e6 100644 > --- a/kernel/kexec.c > +++ b/kernel/kexec.c > @@ -1098,6 +1098,13 @@ COMPAT_SYSCALL_DEFINE4(kexec_load, compat_ulong_t, entry, > } > #endif > > +SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd, > + const char __user *, cmdline_ptr, unsigned long, > + cmdline_len, unsigned long, flags)
initrd is optional for system boot.
How about using int *kernel_fd and int *initrd_fd as the argument? Then if I don't need initrd, in userspace I can do this:
kexec_file_load(&kernel_fd, NULL, ...)
And even you can remove KEXEC_FILE_UNLOAD flag, because you could tell that one wants to unload if the following is invoked:
kexec_file_load(NULL, NULL, ...)
Thanks WANG Chao
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