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authorRoland McGrath <roland@redhat.com>2008-02-06 22:39:45 +0100
committerIngo Molnar <mingo@elte.hu>2008-02-06 22:39:45 +0100
commita57dae3aa4d00a000b5bac4238025438204c78b2 (patch)
tree03a22973e807fa9607ae7deb60c2939f1b8863d1 /arch
parentb5556a67f08559b6c1597f6396c1f9ef460f62b4 (diff)
x86: fix iret exception recovery on 64-bit
This change broke recovery of exceptions in iret: commit 72fe4858544292ad64600765cb78bc02298c6b1c Author: Glauber de Oliveira Costa <gcosta@redhat.com> x86: replace privileged instructions with paravirt macros The ENTRY(native_iret) macro adds alignment padding before the iretq instruction, so "iret_label" no longer points exactly at the instruction. It was sloppy to leave the old "iret_label" label behind when replacing its nearby use. Removing it would have revealed the other use of the label later in the file, and upon noticing that use, anyone exercising the minimum of attention to detail expected of anyone touching this subtle code would realize it needed to change as well. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/entry_64.S3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index e518928114d..c7341e81941 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -582,7 +582,6 @@ retint_restore_args: /* return to kernel space */
TRACE_IRQS_IRETQ
restore_args:
RESTORE_ARGS 0,8,0
-iret_label:
#ifdef CONFIG_PARAVIRT
INTERRUPT_RETURN
#endif
@@ -920,7 +919,7 @@ error_kernelspace:
iret run with kernel gs again, so don't set the user space flag.
B stepping K8s sometimes report an truncated RIP for IRET
exceptions returning to compat mode. Check for these here too. */
- leaq iret_label(%rip),%rbp
+ leaq native_iret(%rip),%rbp
cmpq %rbp,RIP(%rsp)
je error_swapgs
movl %ebp,%ebp /* zero extend */