Merge tag 'pm-extra-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull more power management updates from Rafael Wysocki:
 "A few more fixes and cleanups in the x86-64 low-level hibernation
  code, PM core, cpufreq (Kconfig and intel_pstate), and the operating
  points framework.

  Specifics:

   - Prevent the low-level assembly hibernate code on x86-64 from
     referring to __PAGE_OFFSET directly as a symbol which doesn't work
     when the kernel identity mapping base is randomized, in which case
     __PAGE_OFFSET is a variable (Rafael Wysocki).

   - Avoid selecting CPU_FREQ_STAT by default as the statistics are not
     required for proper cpufreq operation (Borislav Petkov).

   - Add Skylake-X and Broadwell-X IDs to the intel_pstate's list of
     processors where out-of-band (OBB) control of P-states is possible
     and if that is in use, intel_pstate should not attempt to manage
     P-states (Srinivas Pandruvada).

   - Drop some unnecessary checks from the wakeup IRQ handling code in
     the PM core (Markus Elfring).

   - Reduce the number operating performance point (OPP) lookups in one
     of the OPP framework's helper functions (Jisheng Zhang)"

* tag 'pm-extra-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  x86/power/64: Do not refer to __PAGE_OFFSET from assembly code
  cpufreq: Do not default-yes CPU_FREQ_STAT
  cpufreq: intel_pstate: Add more out-of-band IDs
  PM / OPP: optimize dev_pm_opp_set_rate() performance a bit
  PM-wakeup: Delete unnecessary checks before three function calls

2 files changed, 9 insertions, 11 deletions

diff --git a/arch/x86/power/hibernate_64.c b/arch/x86/power/hibernate_64.c
index f2b5e6a5cf95..f0b5f2d402af 100644
--- a/arch/x86/power/hibernate_64.c
+++ b/arch/x86/power/hibernate_64.c
@@ -37,11 +37,11 @@ unsigned long jump_address_phys;
  */
 unsigned long restore_cr3 __visible;
 
-pgd_t *temp_level4_pgt __visible;
+unsigned long temp_level4_pgt __visible;
 
 unsigned long relocated_restore_code __visible;
 
-static int set_up_temporary_text_mapping(void)
+static int set_up_temporary_text_mapping(pgd_t *pgd)
 {
 	pmd_t *pmd;
 	pud_t *pud;
@@ -71,7 +71,7 @@ static int set_up_temporary_text_mapping(void)
 		__pmd((jump_address_phys & PMD_MASK) | __PAGE_KERNEL_LARGE_EXEC));
 	set_pud(pud + pud_index(restore_jump_address),
 		__pud(__pa(pmd) | _KERNPG_TABLE));
-	set_pgd(temp_level4_pgt + pgd_index(restore_jump_address),
+	set_pgd(pgd + pgd_index(restore_jump_address),
 		__pgd(__pa(pud) | _KERNPG_TABLE));
 
 	return 0;
@@ -90,15 +90,16 @@ static int set_up_temporary_mappings(void)
 		.kernel_mapping = true,
 	};
 	unsigned long mstart, mend;
+	pgd_t *pgd;
 	int result;
 	int i;
 
-	temp_level4_pgt = (pgd_t *)get_safe_page(GFP_ATOMIC);
-	if (!temp_level4_pgt)
+	pgd = (pgd_t *)get_safe_page(GFP_ATOMIC);
+	if (!pgd)
 		return -ENOMEM;
 
 	/* Prepare a temporary mapping for the kernel text */
-	result = set_up_temporary_text_mapping();
+	result = set_up_temporary_text_mapping(pgd);
 	if (result)
 		return result;
 
@@ -107,13 +108,12 @@ static int set_up_temporary_mappings(void)
 		mstart = pfn_mapped[i].start << PAGE_SHIFT;
 		mend   = pfn_mapped[i].end << PAGE_SHIFT;
 
-		result = kernel_ident_mapping_init(&info, temp_level4_pgt,
-						   mstart, mend);
-
+		result = kernel_ident_mapping_init(&info, pgd, mstart, mend);
 		if (result)
 			return result;
 	}
 
+	temp_level4_pgt = (unsigned long)pgd - __PAGE_OFFSET;
 	return 0;
 }
 
diff --git a/arch/x86/power/hibernate_asm_64.S b/arch/x86/power/hibernate_asm_64.S
index 8eee0e9c93f0..ce8da3a0412c 100644
--- a/arch/x86/power/hibernate_asm_64.S
+++ b/arch/x86/power/hibernate_asm_64.S
@@ -72,8 +72,6 @@ ENTRY(restore_image)
 	/* code below has been relocated to a safe page */
 ENTRY(core_restore_code)
 	/* switch to temporary page tables */
-	movq	$__PAGE_OFFSET, %rcx
-	subq	%rcx, %rax
 	movq	%rax, %cr3
 	/* flush TLB */
 	movq	%rbx, %rcx