diff options
| author | Martin Hicks <mort@sgi.com> | 2009-01-30 17:50:54 +0100 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-02-03 06:18:03 +0100 |
| commit | a67798cd7bb130bf37f5ffb28f3260f4c10232db (patch) | |
| tree | 4f6e19711f02fd0b860cb428a264eee15b6b3ff1 /arch/x86/kernel/entry_64.S | |
| parent | irq, x86: fix lock status with numa_migrate_irq_desc (diff) | |
| download | linux-a67798cd7bb130bf37f5ffb28f3260f4c10232db.tar.xz linux-a67798cd7bb130bf37f5ffb28f3260f4c10232db.zip | |
x86: push old stack address on irqstack for unwinder
Impact: Fixes dumpstack and KDB on 64 bits
This re-adds the old stack pointer to the top of the irqstack to help
with unwinding. It was removed in commit d99015b1abbad743aa049b439c1e1dede6d0fa49
as part of the save_args out-of-line work.
Both dumpstack and KDB require this information.
Signed-off-by: Martin Hicks <mort@sgi.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/kernel/entry_64.S')
| -rw-r--r-- | arch/x86/kernel/entry_64.S | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index e28c7a987793..a1346217e43c 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -346,6 +346,7 @@ ENTRY(save_args) popq_cfi %rax /* move return address... */ mov %gs:pda_irqstackptr,%rsp EMPTY_FRAME 0 + pushq_cfi %rbp /* backlink for unwinder */ pushq_cfi %rax /* ... to the new stack */ /* * We entered an interrupt context - irqs are off: |