[patch v2 2/2] s390: Add architecture code for unmapping crashkernel memory
holzheu at linux.vnet.ibm.com
Thu Sep 15 04:48:03 EDT 2011
Hello Vivek, Andrew,
On Wed, 2011-09-14 at 14:29 -0400, Vivek Goyal wrote:
> On Wed, Sep 14, 2011 at 10:58:28AM +0200, Michael Holzheu wrote:
> > > Why not make this unconditional, for all architectures which support
> > > hugepages? ie:
> > >
> > > #ifdef HPAGE_SIZE
> > > #define KEXEC_CRASH_MEM_ALIGN HPAGE_SIZE
> > > #else
> > > #define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
> > > #endif
> > > in include/linux/kexec.h?
> > >
> > > IOW, what are the compromises here?
> > If we would do it that way, crashkernel memory on architectures that
> > support large pages but do not support unmapping of crashkernel memory
> > would always be aligned to HPAGE_SIZE. But only PAGE_SIZE alignment
> > would be necessary in that case.
> > If that is acceptable I have no problem to define that unconditional for
> > all architectures. Vivek what do you think?
> As PAGE_SIZE alignment is sufficient for rest of the architecture, I
> am fine with keeping it in arch dependent files.
Ok fine. So I will resend the two patches including Andrew's
resource_size() fix and keep KEXEC_CRASH_MEM_ALIGN definition
More information about the kexec