10 files changed, 37 insertions, 56 deletions

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index f9524933258a..97b64d7d6bf6 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -614,10 +614,14 @@ config X86_PAE
 
 # Common NUMA Features
 config NUMA
-        bool "Numa Memory Allocation and Scheduler Support"
-        depends on SMP && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI)
+        bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
+        depends on SMP && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI) && EXPERIMENTAL
         default n if X86_PC
         default y if (X86_NUMAQ || X86_SUMMIT)
+        help
+          NUMA support for i386. This is currently high experimental
+          and should be only used for kernel development. It might also
+          cause boot failures.
 
 comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
         depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI)
@@ -1228,6 +1232,11 @@ menuconfig INSTRUMENTATION
         bool "Instrumentation Support"
         depends on EXPERIMENTAL
         default y
+        ---help---
+          Say Y here to get to see options related to performance measurement,
+          debugging, and testing. This option alone does not add any kernel code.
+
+          If you say N, all options in this submenu will be skipped and disabled.
 
 if INSTRUMENTATION
 
diff --git a/arch/i386/Makefile b/arch/i386/Makefile
index 01f0ff0daaf4..52b932478c6d 100644
--- a/arch/i386/Makefile
+++ b/arch/i386/Makefile
@@ -51,8 +51,8 @@ cflags-y += -maccumulate-outgoing-args
 CFLAGS                          += $(shell if [ $(call cc-version) -lt 0400 ] ; then echo $(call cc-option,-fno-unit-at-a-time); fi ;)
 
 # do binutils support CFI?
-cflags-y += $(call as-instr,.cfi_startproc\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
-AFLAGS += $(call as-instr,.cfi_startproc\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
+cflags-y += $(call as-instr,.cfi_startproc\n.cfi_rel_offset esp${comma}0\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
+AFLAGS += $(call as-instr,.cfi_startproc\n.cfi_rel_offset esp${comma}0\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
 
 # is .cfi_signal_frame supported too?
 cflags-y += $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1,)
diff --git a/arch/i386/boot/edd.c b/arch/i386/boot/edd.c
index 658834d9f92a..82b5c846a194 100644
--- a/arch/i386/boot/edd.c
+++ b/arch/i386/boot/edd.c
@@ -19,40 +19,12 @@
 
 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
 
-struct edd_dapa {
-        u8      pkt_size;
-        u8      rsvd;
-        u16     sector_cnt;
-        u16     buf_off, buf_seg;
-        u64     lba;
-        u64     buf_lin_addr;
-};
-
 /*
  * Read the MBR (first sector) from a specific device.
  */
 static int read_mbr(u8 devno, void *buf)
 {
-        struct edd_dapa dapa;
-        u16 ax, bx, cx, dx, si;
-
-        memset(&dapa, 0, sizeof dapa);
-        dapa.pkt_size = sizeof(dapa);
-        dapa.sector_cnt = 1;
-        dapa.buf_off = (size_t)buf;
-        dapa.buf_seg = ds();
-        /* dapa.lba = 0; */
-
-        ax = 0x4200;            /* Extended Read */
-        si = (size_t)&dapa;
-        dx = devno;
-        asm("pushfl; stc; int $0x13; setc %%al; popfl"
-            : "+a" (ax), "+S" (si), "+d" (dx)
-            : "m" (dapa)
-            : "ebx", "ecx", "edi", "memory");
-
-        if (!(u8)ax)
-                return 0;       /* OK */
+        u16 ax, bx, cx, dx;
 
         ax = 0x0201;            /* Legacy Read, one sector */
         cx = 0x0001;            /* Sector 0-0-1 */
@@ -65,11 +37,10 @@ static int read_mbr(u8 devno, void *buf)
         return -(u8)ax;         /* 0 or -1 */
 }
 
-static u32 read_mbr_sig(u8 devno, struct edd_info *ei)
+static u32 read_mbr_sig(u8 devno, struct edd_info *ei, u32 *mbrsig)
 {
         int sector_size;
         char *mbrbuf_ptr, *mbrbuf_end;
-        u32 mbrsig;
         u32 buf_base, mbr_base;
         extern char _end[];
 
@@ -85,15 +56,15 @@ static u32 read_mbr_sig(u8 devno, struct edd_info *ei)
 
         /* Make sure we actually have space on the heap... */
         if (!(boot_params.hdr.loadflags & CAN_USE_HEAP))
-                return 0;
+                return -1;
         if (mbrbuf_end > (char *)(size_t)boot_params.hdr.heap_end_ptr)
-                return 0;
+                return -1;
 
         if (read_mbr(devno, mbrbuf_ptr))
-                return 0;
+                return -1;
 
-        mbrsig = *(u32 *)&mbrbuf_ptr[EDD_MBR_SIG_OFFSET];
-        return mbrsig;
+        *mbrsig = *(u32 *)&mbrbuf_ptr[EDD_MBR_SIG_OFFSET];
+        return 0;
 }
 
 static int get_edd_info(u8 devno, struct edd_info *ei)
@@ -160,6 +131,7 @@ void query_edd(void)
         int do_edd = 1;
         int devno;
         struct edd_info ei, *edp;
+        u32 *mbrptr;
 
         if (cmdline_find_option("edd", eddarg, sizeof eddarg) > 0) {
                 if (!strcmp(eddarg, "skipmbr") || !strcmp(eddarg, "skip"))
@@ -168,7 +140,8 @@ void query_edd(void)
                         do_edd = 0;
         }
 
-        edp = (struct edd_info *)boot_params.eddbuf;
+        edp    = boot_params.eddbuf;
+        mbrptr = boot_params.edd_mbr_sig_buffer;
 
         if (!do_edd)
                 return;
@@ -186,11 +159,8 @@ void query_edd(void)
                         boot_params.eddbuf_entries++;
                 }
 
-                if (do_mbr) {
-                        u32 mbr_sig;
-                        mbr_sig = read_mbr_sig(devno, &ei);
-                        boot_params.edd_mbr_sig_buffer[devno-0x80] = mbr_sig;
-                }
+                if (do_mbr && !read_mbr_sig(devno, &ei, mbrptr++))
+                        boot_params.edd_mbr_sig_buf_entries = devno-0x80+1;
         }
 }
 
diff --git a/arch/i386/boot/video.c b/arch/i386/boot/video.c
index 958130ef0042..693f20d3102e 100644
--- a/arch/i386/boot/video.c
+++ b/arch/i386/boot/video.c
@@ -61,7 +61,7 @@ static void store_video_mode(void)
 
         /* Not all BIOSes are clean with respect to the top bit */
         boot_params.screen_info.orig_video_mode = ax & 0x7f;
-        boot_params.screen_info.orig_video_page = page;
+        boot_params.screen_info.orig_video_page = page >> 8;
 }
 
 /*
diff --git a/arch/i386/kernel/alternative.c b/arch/i386/kernel/alternative.c
index 1b66d5c70eaf..9f4ac8b02de4 100644
--- a/arch/i386/kernel/alternative.c
+++ b/arch/i386/kernel/alternative.c
@@ -366,6 +366,8 @@ void apply_paravirt(struct paravirt_patch_site *start,
                 unsigned int used;
 
                 BUG_ON(p->len > MAX_PATCH_LEN);
+                /* prep the buffer with the original instructions */
+                memcpy(insnbuf, p->instr, p->len);
                 used = paravirt_ops.patch(p->instrtype, p->clobbers, insnbuf,
                                           (unsigned long)p->instr, p->len);
 
diff --git a/arch/i386/kernel/apic.c b/arch/i386/kernel/apic.c
index f9fff29e01a9..3d67ae18d762 100644
--- a/arch/i386/kernel/apic.c
+++ b/arch/i386/kernel/apic.c
@@ -1085,7 +1085,7 @@ static int __init detect_init_APIC (void)
         if (l & MSR_IA32_APICBASE_ENABLE)
                 mp_lapic_addr = l & MSR_IA32_APICBASE_BASE;
 
-        if (nmi_watchdog != NMI_NONE)
+        if (nmi_watchdog != NMI_NONE && nmi_watchdog != NMI_DISABLED)
                 nmi_watchdog = NMI_LOCAL_APIC;
 
         printk(KERN_INFO "Found and enabled local APIC!\n");
diff --git a/arch/i386/kernel/nmi.c b/arch/i386/kernel/nmi.c
index 99beac7f96ce..8c1c965eb2a8 100644
--- a/arch/i386/kernel/nmi.c
+++ b/arch/i386/kernel/nmi.c
@@ -77,7 +77,7 @@ static int __init check_nmi_watchdog(void)
         unsigned int *prev_nmi_count;
         int cpu;
 
-        if ((nmi_watchdog == NMI_NONE) || (nmi_watchdog == NMI_DEFAULT))
+        if ((nmi_watchdog == NMI_NONE) || (nmi_watchdog == NMI_DISABLED))
                 return 0;
 
         if (!atomic_read(&nmi_active))
@@ -424,7 +424,7 @@ int proc_nmi_enabled(struct ctl_table *table, int write, struct file *file,
         if (!!old_state == !!nmi_watchdog_enabled)
                 return 0;
 
-        if (atomic_read(&nmi_active) < 0) {
+        if (atomic_read(&nmi_active) < 0 || nmi_watchdog == NMI_DISABLED) {
                 printk( KERN_WARNING "NMI watchdog is permanently disabled\n");
                 return -EIO;
         }
diff --git a/arch/i386/kernel/tsc.c b/arch/i386/kernel/tsc.c
index debd7dbb4158..a39280b4dd3a 100644
--- a/arch/i386/kernel/tsc.c
+++ b/arch/i386/kernel/tsc.c
@@ -292,7 +292,6 @@ static struct clocksource clocksource_tsc = {
 
 void mark_tsc_unstable(char *reason)
 {
-        sched_clock_unstable_event();
         if (!tsc_unstable) {
                 tsc_unstable = 1;
                 tsc_enabled = 0;
diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c
index 01ffdd4964f0..fcb38e7f3543 100644
--- a/arch/i386/mm/fault.c
+++ b/arch/i386/mm/fault.c
@@ -249,9 +249,10 @@ static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
         pmd_k = pmd_offset(pud_k, address);
         if (!pmd_present(*pmd_k))
                 return NULL;
-        if (!pmd_present(*pmd))
+        if (!pmd_present(*pmd)) {
                 set_pmd(pmd, *pmd_k);
-        else
+                arch_flush_lazy_mmu_mode();
+        } else
                 BUG_ON(pmd_page(*pmd) != pmd_page(*pmd_k));
         return pmd_k;
 }
diff --git a/arch/i386/xen/xen-head.S b/arch/i386/xen/xen-head.S
index bc71f3bc4014..f8d6937db2ec 100644
--- a/arch/i386/xen/xen-head.S
+++ b/arch/i386/xen/xen-head.S
@@ -7,20 +7,20 @@
 #include <asm/boot.h>
 #include <xen/interface/elfnote.h>
 
-        .section .init.text
+.pushsection .init.text
 ENTRY(startup_xen)
         movl %esi,xen_start_info
         cld
         movl $(init_thread_union+THREAD_SIZE),%esp
         jmp xen_start_kernel
+.popsection
 
-.pushsection ".bss.page_aligned"
+.pushsection .bss.page_aligned
         .align PAGE_SIZE_asm
 ENTRY(hypercall_page)
         .skip 0x1000
 .popsection
 
-        .section .text
         ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS,       .asciz "linux")
         ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION,  .asciz "2.6")
         ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION,    .asciz "xen-3.0")