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Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86-64: Fix CFI data for interrupt frames
  x86-64: Don't apply destructive erratum workaround on unaffected CPUs
This commit is contained in:
Linus Torvalds
2011-10-26 17:42:03 +02:00
parent 0791e98dd1 eab9e6137f
commit 7b86572a7a
3 changed files with 18 additions and 6 deletions
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14
arch/x86/kernel/entry_64.S
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@@ -331,10 +331,15 @@ ENDPROC(native_usergs_sysret64)
1: incl PER_CPU_VAR(irq_count)
jne 2f
mov PER_CPU_VAR(irq_stack_ptr),%rsp
EMPTY_FRAME 0
CFI_DEF_CFA_REGISTER rsi
2: /* Store previous stack value */
pushq %rsi
CFI_ESCAPE 0x0f /* DW_CFA_def_cfa_expression */, 6, \
0x77 /* DW_OP_breg7 */, 0, \
0x06 /* DW_OP_deref */, \
0x08 /* DW_OP_const1u */, SS+8-RBP, \
0x22 /* DW_OP_plus */
/* We entered an interrupt context - irqs are off: */
TRACE_IRQS_OFF
.endm
@@ -788,7 +793,6 @@ END(interrupt)
subq $ORIG_RAX-RBP, %rsp
CFI_ADJUST_CFA_OFFSET ORIG_RAX-RBP
SAVE_ARGS_IRQ
PARTIAL_FRAME 0
call \func
.endm
@@ -813,10 +817,10 @@ ret_from_intr:
/* Restore saved previous stack */
popq %rsi
leaq 16(%rsi), %rsp
CFI_DEF_CFA_REGISTER rsi
leaq ARGOFFSET-RBP(%rsi), %rsp
CFI_DEF_CFA_REGISTER rsp
CFI_ADJUST_CFA_OFFSET -16
CFI_ADJUST_CFA_OFFSET RBP-ARGOFFSET
exit_intr:
GET_THREAD_INFO(%rcx)