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Commit 7b86572a authored by Linus Torvalds's avatar Linus Torvalds
Browse files

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

* '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
parents 0791e98d eab9e613

arch/x86/include/asm/dwarf2.h

+2 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
#define CFI_REMEMBER_STATE	.cfi_remember_state

#define CFI_RESTORE_STATE	.cfi_restore_state

#define CFI_UNDEFINED		.cfi_undefined

#define CFI_ESCAPE		.cfi_escape



#ifdef CONFIG_AS_CFI_SIGNAL_FRAME

#define CFI_SIGNAL_FRAME	.cfi_signal_frame
@@ -68,6 +69,7 @@ 
#define CFI_REMEMBER_STATE	cfi_ignore

#define CFI_RESTORE_STATE	cfi_ignore

#define CFI_UNDEFINED		cfi_ignore

#define CFI_ESCAPE		cfi_ignore

#define CFI_SIGNAL_FRAME	cfi_ignore



#endif

arch/x86/kernel/entry_64.S

+9 −5
Original line number Diff line number Diff line
@@ -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)

arch/x86/mm/fault.c

+7 −1
Original line number Diff line number Diff line
@@ -420,12 +420,14 @@ static noinline __kprobes int vmalloc_fault(unsigned long address) 
	return 0;

}



#ifdef CONFIG_CPU_SUP_AMD

static const char errata93_warning[] =

KERN_ERR 

"******* Your BIOS seems to not contain a fix for K8 errata #93\n"

"******* Working around it, but it may cause SEGVs or burn power.\n"

"******* Please consider a BIOS update.\n"

"******* Disabling USB legacy in the BIOS may also help.\n";

#endif



/*

 * No vm86 mode in 64-bit mode:
@@ -505,7 +507,11 @@ static void dump_pagetable(unsigned long address) 
 */

static int is_errata93(struct pt_regs *regs, unsigned long address)

{

#ifdef CONFIG_X86_64

#if defined(CONFIG_X86_64) && defined(CONFIG_CPU_SUP_AMD)

	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD

	    || boot_cpu_data.x86 != 0xf)

		return 0;



	if (address != regs->ip)

		return 0;