Commit-ID: c100a583601d357f923c41af5434dc1f8d07890f Gitweb: https://git.kernel.org/tip/c100a583601d357f923c41af5434dc1f8d07890f Author: Baoquan He <b...@redhat.com> AuthorDate: Fri, 2 Mar 2018 13:18:01 +0800 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Mon, 12 Mar 2018 09:43:56 +0100
kdump, vmcoreinfo: Export pgtable_l5_enabled value User-space utilities examining crash-kernels need to know if the crashed kernel was in 5-level paging mode or not. So write 'pgtable_l5_enabled' to vmcoreinfo, which covers these three cases: pgtable_l5_enabled == 0 when: - Compiled with !CONFIG_X86_5LEVEL - Compiled with CONFIG_X86_5LEVEL=y while CPU has no 'la57' flag pgtable_l5_enabled != 0 when: - Compiled with CONFIG_X86_5LEVEL=y and CPU has 'la57' flag Signed-off-by: Baoquan He <b...@redhat.com> Acked-by: Kirill A. Shutemov <kirill.shute...@linux.intel.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Cc: douly.f...@cn.fujitsu.com Cc: dyo...@redhat.com Cc: ebied...@xmission.com Cc: kirill.shute...@linux.intel.com Cc: vgo...@redhat.com Link: http://lkml.kernel.org/r/20180302051801.19594-1-...@redhat.com Signed-off-by: Ingo Molnar <mi...@kernel.org> --- arch/x86/kernel/machine_kexec_64.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c index 3b7427aa7d85..02f913cb27b5 100644 --- a/arch/x86/kernel/machine_kexec_64.c +++ b/arch/x86/kernel/machine_kexec_64.c @@ -350,6 +350,7 @@ void arch_crash_save_vmcoreinfo(void) { VMCOREINFO_NUMBER(phys_base); VMCOREINFO_SYMBOL(init_top_pgt); + VMCOREINFO_NUMBER(pgtable_l5_enabled); #ifdef CONFIG_NUMA VMCOREINFO_SYMBOL(node_data);
