4 files changed, 50 insertions, 34 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index b3a5aad7e629..681d6152e003 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -571,6 +571,8 @@ and is between 256 and 4096 characters. It is defined in the file
 
         debug_objects   [KNL] Enable object debugging
 
+        debugpat        [X86] Enable PAT debugging
+
         decnet.addr=    [HW,NET]
                         Format: <area>[,<node>]
                         See also Documentation/networking/decnet.txt.
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 6958d6bcaf70..2642b4bf41b9 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -447,7 +447,6 @@ config PARAVIRT_DEBUG
 config MEMTEST
         bool "Memtest"
         depends on X86_64
-        default y
         help
           This option adds a kernel parameter 'memtest', which allows memtest
           to be set.
@@ -455,7 +454,7 @@ config MEMTEST
                 memtest=1, mean do 1 test pattern;
                 ...
                 memtest=4, mean do 4 test patterns.
-          If you are unsure how to answer this question, answer Y.
+          If you are unsure how to answer this question, answer N.
 
 config X86_SUMMIT_NUMA
         def_bool y
@@ -1135,21 +1134,18 @@ config MTRR
           See <file:Documentation/mtrr.txt> for more information.
 
 config MTRR_SANITIZER
-        def_bool y
+        bool
         prompt "MTRR cleanup support"
         depends on MTRR
         help
-          Convert MTRR layout from continuous to discrete, so some X driver
-          could add WB entries.
+          Convert MTRR layout from continuous to discrete, so X drivers can
+          add writeback entries.
 
-          Say N here if you see bootup problems (boot crash, boot hang,
-          spontaneous reboots).
+          Can be disabled with disable_mtrr_cleanup on the kernel command line.
+          The largest mtrr entry size for a continous block can be set with
+          mtrr_chunk_size.
 
-          Could be disabled with disable_mtrr_cleanup. Also mtrr_chunk_size
-          could be used to send largest mtrr entry size for continuous block
-          to hold holes (aka. UC entries)
-
-          If unsure, say Y.
+          If unsure, say N.
 
 config MTRR_SANITIZER_ENABLE_DEFAULT
         int "MTRR cleanup enable value (0-1)"
@@ -1166,7 +1162,7 @@ config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
         depends on MTRR_SANITIZER
         help
           mtrr cleanup spare entries default, it can be changed via
-          mtrr_spare_reg_nr=
+          mtrr_spare_reg_nr=N on the kernel command line.
 
 config X86_PAT
         bool
diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index e6a4b564ccaa..793ad2045f58 100644
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -23,6 +23,15 @@ static unsigned long acpi_realmode;
 static char temp_stack[10240];
 #endif
 
+/* XXX: this macro should move to asm-x86/segment.h and be shared with the
+   boot code... */
+#define GDT_ENTRY(flags, base, limit)           \
+        (((u64)(base & 0xff000000) << 32) |     \
+         ((u64)flags << 40) |                   \
+         ((u64)(limit & 0x00ff0000) << 32) |    \
+         ((u64)(base & 0x00ffffff) << 16) |     \
+         ((u64)(limit & 0x0000ffff)))
+
 /**
  * acpi_save_state_mem - save kernel state
  *
@@ -51,18 +60,27 @@ int acpi_save_state_mem(void)
         header->video_mode = saved_video_mode;
 
         header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
+
+        /*
+         * Set up the wakeup GDT.  We set these up as Big Real Mode,
+         * that is, with limits set to 4 GB.  At least the Lenovo
+         * Thinkpad X61 is known to need this for the video BIOS
+         * initialization quirk to work; this is likely to also
+         * be the case for other laptops or integrated video devices.
+         */
+
         /* GDT[0]: GDT self-pointer */
         header->wakeup_gdt[0] =
                 (u64)(sizeof(header->wakeup_gdt) - 1) +
                 ((u64)(acpi_wakeup_address +
                         ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
                                 << 16);
-        /* GDT[1]: real-mode-like code segment */
-        header->wakeup_gdt[1] = (0x009bULL << 40) +
-                ((u64)acpi_wakeup_address << 16) + 0xffff;
-        /* GDT[2]: real-mode-like data segment */
-        header->wakeup_gdt[2] = (0x0093ULL << 40) +
-                ((u64)acpi_wakeup_address << 16) + 0xffff;
+        /* GDT[1]: big real mode-like code segment */
+        header->wakeup_gdt[1] =
+                GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
+        /* GDT[2]: big real mode-like data segment */
+        header->wakeup_gdt[2] =
+                GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
 
 #ifndef CONFIG_64BIT
         store_gdt((struct desc_ptr *)&header->pmode_gdt);
diff --git a/include/asm-x86/dwarf2.h b/include/asm-x86/dwarf2.h
index fd4a6a0393ac..738bb9fb3e53 100644
--- a/include/asm-x86/dwarf2.h
+++ b/include/asm-x86/dwarf2.h
@@ -38,23 +38,23 @@
 
 /* Due to the structure of pre-exisiting code, don't use assembler line
    comment character # to ignore the arguments. Instead, use a dummy macro. */
-.macro __cfi_ignore a=0, b=0, c=0, d=0
+.macro cfi_ignore a=0, b=0, c=0, d=0
 .endm
 
-#define CFI_STARTPROC   __cfi_ignore
-#define CFI_ENDPROC     __cfi_ignore
-#define CFI_DEF_CFA     __cfi_ignore
-#define CFI_DEF_CFA_REGISTER    __cfi_ignore
-#define CFI_DEF_CFA_OFFSET      __cfi_ignore
-#define CFI_ADJUST_CFA_OFFSET   __cfi_ignore
-#define CFI_OFFSET      __cfi_ignore
-#define CFI_REL_OFFSET  __cfi_ignore
-#define CFI_REGISTER    __cfi_ignore
-#define CFI_RESTORE     __cfi_ignore
-#define CFI_REMEMBER_STATE __cfi_ignore
-#define CFI_RESTORE_STATE __cfi_ignore
-#define CFI_UNDEFINED __cfi_ignore
-#define CFI_SIGNAL_FRAME __cfi_ignore
+#define CFI_STARTPROC   cfi_ignore
+#define CFI_ENDPROC     cfi_ignore
+#define CFI_DEF_CFA     cfi_ignore
+#define CFI_DEF_CFA_REGISTER    cfi_ignore
+#define CFI_DEF_CFA_OFFSET      cfi_ignore
+#define CFI_ADJUST_CFA_OFFSET   cfi_ignore
+#define CFI_OFFSET      cfi_ignore
+#define CFI_REL_OFFSET  cfi_ignore
+#define CFI_REGISTER    cfi_ignore
+#define CFI_RESTORE     cfi_ignore
+#define CFI_REMEMBER_STATE cfi_ignore
+#define CFI_RESTORE_STATE cfi_ignore
+#define CFI_UNDEFINED cfi_ignore
+#define CFI_SIGNAL_FRAME cfi_ignore
 
 #endif