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| author | Baoquan He <bhe@redhat.com> | 2018-03-02 13:18:01 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-03-12 09:43:56 +0100 |
| commit | c100a583601d357f923c41af5434dc1f8d07890f (patch) | |
| tree | 57fdba08df370ee286a6a935dec2e9f624fb4254 /arch/x86/kernel/machine_kexec_64.c | |
| parent | e9d0e6330eb81ca49bdd8849cc52b3b0f70ed5cb (diff) | |
| download | lwn-c100a583601d357f923c41af5434dc1f8d07890f.tar.gz lwn-c100a583601d357f923c41af5434dc1f8d07890f.zip | |
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 <bhe@redhat.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: douly.fnst@cn.fujitsu.com
Cc: dyoung@redhat.com
Cc: ebiederm@xmission.com
Cc: kirill.shutemov@linux.intel.com
Cc: vgoyal@redhat.com
Link: http://lkml.kernel.org/r/20180302051801.19594-1-bhe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/machine_kexec_64.c')
| -rw-r--r-- | arch/x86/kernel/machine_kexec_64.c | 1 |
1 files changed, 1 insertions, 0 deletions
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); |