Hi Ricardo, On Wed, 21 Dec 2022 20:45:59 +0100 Ricardo Ribalda <ribalda@xxxxxxxxxxxx> wrote: > Add two parameters to specify how many times a kexec kernel can be loaded. > > The sysadmin can set different limits for kexec panic and kexec reboot > kernels. > > The value can be modified at runtime via sysctl, but only with a value > smaller than the current one (except -1). > > Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx> > --- > Documentation/admin-guide/sysctl/kernel.rst | 18 ++++++ > include/linux/kexec.h | 2 +- > kernel/kexec.c | 4 +- > kernel/kexec_core.c | 87 ++++++++++++++++++++++++++++- > kernel/kexec_file.c | 11 ++-- > 5 files changed, 114 insertions(+), 8 deletions(-) > > diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst > index 97394bd9d065..a3922dffbd47 100644 > --- a/Documentation/admin-guide/sysctl/kernel.rst > +++ b/Documentation/admin-guide/sysctl/kernel.rst > @@ -461,6 +461,24 @@ allowing a system to set up (and later use) an image without it being > altered. > Generally used together with the `modules_disabled`_ sysctl. > > +kexec_load_limit_panic > +====================== > + > +This parameter specifies a limit to the number of times the syscalls > +``kexec_load`` and ``kexec_file_load`` can be called with a crash > +image. It can only be set with a more restrictive value than the > +current one. > + > += ============================================================= > +-1 Unlimited calls to kexec. This is the default setting. > +N Number of calls left. > += ============================================================= > + > +kexec_load_limit_reboot > +====================== > + > +Similar functionality as ``kexec_load_limit_panic``, but for a crash > +image. Is this description correct? IIUC the ``kexec_load_limit_panic`` is for the crash image, and ``kexec_load_limit_reboot`` is for the normal image, but the sentence above says again: "for a crash image." Petr T
