Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6:
  [IA64] Clean up linker script using standard macros.
  [IA64] Use standard macros for page-aligned data.
  [IA64] Use .ref.text, not .text.init for start_ap.
  [IA64] sgi-xp: fix printk format warnings
  [IA64] ioc4_serial: fix printk format warnings
  [IA64] mbcs: fix printk format warnings
  [IA64] pci_br, fix infinite loop in find_free_ate()
  [IA64] kdump: Short path to freeze CPUs
  [IA64] kdump: Try INIT regardless of
  [IA64] kdump: Mask INIT first in panic-kdump path
  [IA64] kdump: Don't return APs to SAL from kdump
  [IA64] kexec: Unregister MCA handler before kexec
  [IA64] kexec: Make INIT safe while transition to
  [IA64] kdump: Mask MCA/INIT on frozen cpus

Fix up conflict in arch/ia64/kernel/vmlinux.lds.S as per Tony's
suggestion.

7 files changed, 150 insertions, 131 deletions

diff --git a/arch/ia64/kernel/crash.c b/arch/ia64/kernel/crash.c
index f065093f8e9b..6631a9dfafdc 100644
--- a/arch/ia64/kernel/crash.c
+++ b/arch/ia64/kernel/crash.c
@@ -23,6 +23,7 @@
 int kdump_status[NR_CPUS];
 static atomic_t kdump_cpu_frozen;
 atomic_t kdump_in_progress;
+static int kdump_freeze_monarch;
 static int kdump_on_init = 1;
 static int kdump_on_fatal_mca = 1;
 
@@ -108,10 +109,38 @@ machine_crash_shutdown(struct pt_regs *pt)
 	 */
 	kexec_disable_iosapic();
 #ifdef CONFIG_SMP
+	/*
+	 * If kdump_on_init is set and an INIT is asserted here, kdump will
+	 * be started again via INIT monarch.
+	 */
+	local_irq_disable();
+	ia64_set_psr_mc();	/* mask MCA/INIT */
+	if (atomic_inc_return(&kdump_in_progress) != 1)
+		unw_init_running(kdump_cpu_freeze, NULL);
+
+	/*
+	 * Now this cpu is ready for kdump.
+	 * Stop all others by IPI or INIT.  They could receive INIT from
+	 * outside and might be INIT monarch, but only thing they have to
+	 * do is falling into kdump_cpu_freeze().
+	 *
+	 * If an INIT is asserted here:
+	 * - All receivers might be slaves, since some of cpus could already
+	 *   be frozen and INIT might be masked on monarch.  In this case,
+	 *   all slaves will be frozen soon since kdump_in_progress will let
+	 *   them into DIE_INIT_SLAVE_LEAVE.
+	 * - One might be a monarch, but INIT rendezvous will fail since
+	 *   at least this cpu already have INIT masked so it never join
+	 *   to the rendezvous.  In this case, all slaves and monarch will
+	 *   be frozen soon with no wait since the INIT rendezvous is skipped
+	 *   by kdump_in_progress.
+	 */
 	kdump_smp_send_stop();
 	/* not all cpu response to IPI, send INIT to freeze them */
-	if (kdump_wait_cpu_freeze() && kdump_on_init) 	{
+	if (kdump_wait_cpu_freeze()) {
 		kdump_smp_send_init();
+		/* wait again, don't go ahead if possible */
+		kdump_wait_cpu_freeze();
 	}
 #endif
 }
@@ -129,17 +158,17 @@ void
 kdump_cpu_freeze(struct unw_frame_info *info, void *arg)
 {
 	int cpuid;
+
 	local_irq_disable();
 	cpuid = smp_processor_id();
 	crash_save_this_cpu();
 	current->thread.ksp = (__u64)info->sw - 16;
+
+	ia64_set_psr_mc();	/* mask MCA/INIT and stop reentrance */
+
 	atomic_inc(&kdump_cpu_frozen);
 	kdump_status[cpuid] = 1;
 	mb();
-#ifdef CONFIG_HOTPLUG_CPU
-	if (cpuid != 0)
-		ia64_jump_to_sal(&sal_boot_rendez_state[cpuid]);
-#endif
 	for (;;)
 		cpu_relax();
 }
@@ -150,6 +179,20 @@ kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data)
 	struct ia64_mca_notify_die *nd;
 	struct die_args *args = data;
 
+	if (atomic_read(&kdump_in_progress)) {
+		switch (val) {
+		case DIE_INIT_MONARCH_LEAVE:
+			if (!kdump_freeze_monarch)
+				break;
+			/* fall through */
+		case DIE_INIT_SLAVE_LEAVE:
+		case DIE_INIT_MONARCH_ENTER:
+		case DIE_MCA_RENDZVOUS_LEAVE:
+			unw_init_running(kdump_cpu_freeze, NULL);
+			break;
+		}
+	}
+
 	if (!kdump_on_init && !kdump_on_fatal_mca)
 		return NOTIFY_DONE;
 
@@ -162,43 +205,31 @@ kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data)
 	}
 
 	if (val != DIE_INIT_MONARCH_LEAVE &&
-	    val != DIE_INIT_SLAVE_LEAVE &&
 	    val != DIE_INIT_MONARCH_PROCESS &&
-	    val != DIE_MCA_RENDZVOUS_LEAVE &&
 	    val != DIE_MCA_MONARCH_LEAVE)
 		return NOTIFY_DONE;
 
 	nd = (struct ia64_mca_notify_die *)args->err;
-	/* Reason code 1 means machine check rendezvous*/
-	if ((val == DIE_INIT_MONARCH_LEAVE || val == DIE_INIT_SLAVE_LEAVE
-	    || val == DIE_INIT_MONARCH_PROCESS) && nd->sos->rv_rc == 1)
-		return NOTIFY_DONE;
 
 	switch (val) {
 	case DIE_INIT_MONARCH_PROCESS:
-		if (kdump_on_init) {
-			atomic_set(&kdump_in_progress, 1);
-			*(nd->monarch_cpu) = -1;
+		/* Reason code 1 means machine check rendezvous*/
+		if (kdump_on_init && (nd->sos->rv_rc != 1)) {
+			if (atomic_inc_return(&kdump_in_progress) != 1)
+				kdump_freeze_monarch = 1;
 		}
 		break;
 	case DIE_INIT_MONARCH_LEAVE:
-		if (kdump_on_init)
+		/* Reason code 1 means machine check rendezvous*/
+		if (kdump_on_init && (nd->sos->rv_rc != 1))
 			machine_kdump_on_init();
 		break;
-	case DIE_INIT_SLAVE_LEAVE:
-		if (atomic_read(&kdump_in_progress))
-			unw_init_running(kdump_cpu_freeze, NULL);
-		break;
-	case DIE_MCA_RENDZVOUS_LEAVE:
-		if (atomic_read(&kdump_in_progress))
-			unw_init_running(kdump_cpu_freeze, NULL);
-		break;
 	case DIE_MCA_MONARCH_LEAVE:
 		/* *(nd->data) indicate if MCA is recoverable */
 		if (kdump_on_fatal_mca && !(*(nd->data))) {
-			atomic_set(&kdump_in_progress, 1);
-			*(nd->monarch_cpu) = -1;
-			machine_kdump_on_init();
+			if (atomic_inc_return(&kdump_in_progress) == 1)
+				machine_kdump_on_init();
+			/* We got fatal MCA while kdump!? No way!! */
 		}
 		break;
 	}
diff --git a/arch/ia64/kernel/head.S b/arch/ia64/kernel/head.S
index 23f846de62d5..1a6e44515eb4 100644
--- a/arch/ia64/kernel/head.S
+++ b/arch/ia64/kernel/head.S
@@ -167,7 +167,7 @@ RestRR:											\
 	mov _tmp2=((ia64_rid(IA64_REGION_ID_KERNEL, (num<<61)) << 8) | (pgsize << 2) | vhpt);; \
 	mov rr[_tmp1]=_tmp2
 
-	.section __special_page_section,"ax"
+	__PAGE_ALIGNED_DATA
 
 	.global empty_zero_page
 empty_zero_page:
@@ -181,7 +181,7 @@ swapper_pg_dir:
 halt_msg:
 	stringz "Halting kernel\n"
 
-	.section .text.head,"ax"
+	__REF
 
 	.global start_ap
 
@@ -1242,7 +1242,7 @@ GLOBAL_ENTRY(ia64_jump_to_sal)
 	movl r16=SAL_PSR_BITS_TO_SET;;
 	mov cr.ipsr=r16
 	mov cr.ifs=r0;;
-	rfi;;
+	rfi;;			// note: this unmask MCA/INIT (psr.mc)
 1:
 	/*
 	 * Invalidate all TLB data/inst
diff --git a/arch/ia64/kernel/machine_kexec.c b/arch/ia64/kernel/machine_kexec.c
index 0823de1f6ebe..3d3aeef46947 100644
--- a/arch/ia64/kernel/machine_kexec.c
+++ b/arch/ia64/kernel/machine_kexec.c
@@ -24,6 +24,8 @@
 #include <asm/delay.h>
 #include <asm/meminit.h>
 #include <asm/processor.h>
+#include <asm/sal.h>
+#include <asm/mca.h>
 
 typedef NORET_TYPE void (*relocate_new_kernel_t)(
 					unsigned long indirection_page,
@@ -85,13 +87,26 @@ static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
 	void *pal_addr = efi_get_pal_addr();
 	unsigned long code_addr = (unsigned long)page_address(image->control_code_page);
 	int ii;
+	u64 fp, gp;
+	ia64_fptr_t *init_handler = (ia64_fptr_t *)ia64_os_init_on_kdump;
 
 	BUG_ON(!image);
 	if (image->type == KEXEC_TYPE_CRASH) {
 		crash_save_this_cpu();
 		current->thread.ksp = (__u64)info->sw - 16;
+
+		/* Register noop init handler */
+		fp = ia64_tpa(init_handler->fp);
+		gp = ia64_tpa(ia64_getreg(_IA64_REG_GP));
+		ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, fp, gp, 0, fp, gp, 0);
+	} else {
+		/* Unregister init handlers of current kernel */
+		ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, 0, 0, 0, 0, 0, 0);
 	}
 
+	/* Unregister mca handler - No more recovery on current kernel */
+	ia64_sal_set_vectors(SAL_VECTOR_OS_MCA, 0, 0, 0, 0, 0, 0);
+
 	/* Interrupts aren't acceptable while we reboot */
 	local_irq_disable();
 
diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index 7b30d21c5190..d2877a7bfe2e 100644
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -1682,14 +1682,25 @@ ia64_init_handler(struct pt_regs *regs, struct switch_stack *sw,
 
 	if (!sos->monarch) {
 		ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_INIT;
+
+#ifdef CONFIG_KEXEC
+		while (monarch_cpu == -1 && !atomic_read(&kdump_in_progress))
+			udelay(1000);
+#else
 		while (monarch_cpu == -1)
-		       cpu_relax();	/* spin until monarch enters */
+			cpu_relax();	/* spin until monarch enters */
+#endif
 
 		NOTIFY_INIT(DIE_INIT_SLAVE_ENTER, regs, (long)&nd, 1);
 		NOTIFY_INIT(DIE_INIT_SLAVE_PROCESS, regs, (long)&nd, 1);
 
+#ifdef CONFIG_KEXEC
+		while (monarch_cpu != -1 && !atomic_read(&kdump_in_progress))
+			udelay(1000);
+#else
 		while (monarch_cpu != -1)
-		       cpu_relax();	/* spin until monarch leaves */
+			cpu_relax();	/* spin until monarch leaves */
+#endif
 
 		NOTIFY_INIT(DIE_INIT_SLAVE_LEAVE, regs, (long)&nd, 1);
 
diff --git a/arch/ia64/kernel/mca_asm.S b/arch/ia64/kernel/mca_asm.S
index a06d46548ff9..7461d2573d41 100644
--- a/arch/ia64/kernel/mca_asm.S
+++ b/arch/ia64/kernel/mca_asm.S
@@ -40,6 +40,7 @@
 
 	.global ia64_do_tlb_purge
 	.global ia64_os_mca_dispatch
+	.global ia64_os_init_on_kdump
 	.global ia64_os_init_dispatch_monarch
 	.global ia64_os_init_dispatch_slave
 
@@ -299,6 +300,25 @@ END(ia64_os_mca_virtual_begin)
 //StartMain////////////////////////////////////////////////////////////////////
 
 //
+// NOP init handler for kdump.  In panic situation, we may receive INIT
+// while kernel transition.  Since we initialize registers on leave from
+// current kernel, no longer monarch/slave handlers of current kernel in
+// virtual mode are called safely.
+// We can unregister these init handlers from SAL, however then the INIT
+// will result in warmboot by SAL and we cannot retrieve the crashdump.
+// Therefore register this NOP function to SAL, to prevent entering virtual
+// mode and resulting warmboot by SAL.
+//
+ia64_os_init_on_kdump:
+	mov		r8=r0		// IA64_INIT_RESUME
+	mov             r9=r10		// SAL_GP
+	mov		r22=r17		// *minstate
+	;;
+	mov		r10=r0		// return to same context
+	mov		b0=r12		// SAL_CHECK return address
+	br		b0
+
+//
 // SAL to OS entry point for INIT on all processors.  This has been defined for
 // registration purposes with SAL as a part of ia64_mca_init.  Monarch and
 // slave INIT have identical processing, except for the value of the
@@ -1073,3 +1093,30 @@ GLOBAL_ENTRY(ia64_get_rnat)
 	mov ar.rsc=3
 	br.ret.sptk.many rp
 END(ia64_get_rnat)
+
+
+// void ia64_set_psr_mc(void)
+//
+// Set psr.mc bit to mask MCA/INIT.
+GLOBAL_ENTRY(ia64_set_psr_mc)
+	rsm psr.i | psr.ic		// disable interrupts
+	;;
+	srlz.d
+	;;
+	mov r14 = psr			// get psr{36:35,31:0}
+	movl r15 = 1f
+	;;
+	dep r14 = -1, r14, PSR_MC, 1	// set psr.mc
+	;;
+	dep r14 = -1, r14, PSR_IC, 1	// set psr.ic
+	;;
+	dep r14 = -1, r14, PSR_BN, 1	// keep bank1 in use
+	;;
+	mov cr.ipsr = r14
+	mov cr.ifs = r0
+	mov cr.iip = r15
+	;;
+	rfi
+1:
+	br.ret.sptk.many rp
+END(ia64_set_psr_mc)
diff --git a/arch/ia64/kernel/relocate_kernel.S b/arch/ia64/kernel/relocate_kernel.S
index 903babd22d62..32f6fc131fbe 100644
--- a/arch/ia64/kernel/relocate_kernel.S
+++ b/arch/ia64/kernel/relocate_kernel.S
@@ -52,7 +52,7 @@ GLOBAL_ENTRY(relocate_new_kernel)
 	srlz.i
 	;;
 	mov ar.rnat=r18
-	rfi
+	rfi				// note: this unmask MCA/INIT (psr.mc)
 	;;
 1:
 	//physical mode code begin
diff --git a/arch/ia64/kernel/vmlinux.lds.S b/arch/ia64/kernel/vmlinux.lds.S
index eb4214d1c5af..0a0c77b2c988 100644
--- a/arch/ia64/kernel/vmlinux.lds.S
+++ b/arch/ia64/kernel/vmlinux.lds.S
@@ -51,8 +51,6 @@ SECTIONS
 	KPROBES_TEXT
 	*(.gnu.linkonce.t*)
     }
-  .text.head : AT(ADDR(.text.head) - LOAD_OFFSET)
-	{ *(.text.head) }
   .text2 : AT(ADDR(.text2) - LOAD_OFFSET)
 	{ *(.text2) }
 #ifdef CONFIG_SMP
@@ -66,14 +64,7 @@ SECTIONS
   NOTES :code :note		/* put .notes in text and mark in PT_NOTE  */
   code_continues : {} :code	/* switch back to regular program...  */
 
-  /* Exception table */
-  . = ALIGN(16);
-  __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET)
-	{
-	  __start___ex_table = .;
-	  *(__ex_table)
-	  __stop___ex_table = .;
-	}
+  EXCEPTION_TABLE(16)
 
   /* MCA table */
   . = ALIGN(16);
@@ -115,38 +106,9 @@ SECTIONS
 
   . = ALIGN(PAGE_SIZE);
   __init_begin = .;
-  .init.text : AT(ADDR(.init.text) - LOAD_OFFSET)
-	{
-	  _sinittext = .;
-	  INIT_TEXT
-	  _einittext = .;
-	}
-
-  .init.data : AT(ADDR(.init.data) - LOAD_OFFSET)
-	{ INIT_DATA }
 
-#ifdef CONFIG_BLK_DEV_INITRD
-  .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET)
-	{
-	  __initramfs_start = .;
-	  *(.init.ramfs)
-	  __initramfs_end = .;
-	}
-#endif
-
-   . = ALIGN(16);
-  .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET)
-        {
-	  __setup_start = .;
-	  *(.init.setup)
-	  __setup_end = .;
-	}
-  .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET)
-	{
-	  __initcall_start = .;
-	INITCALLS
-	  __initcall_end = .;
-	}
+  INIT_TEXT_SECTION(PAGE_SIZE)
+  INIT_DATA_SECTION(16)
 
   .data.patch.vtop : AT(ADDR(.data.patch.vtop) - LOAD_OFFSET)
 	{
@@ -204,24 +166,13 @@ SECTIONS
 	}
 #endif
 
-  . = ALIGN(8);
-   __con_initcall_start = .;
-  .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET)
-	{ *(.con_initcall.init) }
-  __con_initcall_end = .;
-  __security_initcall_start = .;
-  .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET)
-	{ *(.security_initcall.init) }
-  __security_initcall_end = .;
   . = ALIGN(PAGE_SIZE);
   __init_end = .;
 
-  /* The initial task and kernel stack */
-  .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET)
-	{ *(.data.init_task) }
-
   .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET)
-        { *(__special_page_section)
+        {
+	PAGE_ALIGNED_DATA(PAGE_SIZE)
+	  . = ALIGN(PAGE_SIZE);
 	  __start_gate_section = .;
 	  *(.data.gate)
 	  __stop_gate_section = .;
@@ -236,12 +187,6 @@ SECTIONS
   				 * kernel data
 				 */
 
-  .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET)
-        { *(.data.read_mostly) }
-
-  .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET)
-        { *(.data.cacheline_aligned) }
-
   /* Per-cpu data: */
   . = ALIGN(PERCPU_PAGE_SIZE);
   PERCPU_VADDR(PERCPU_ADDR, :percpu)
@@ -258,6 +203,9 @@ SECTIONS
 		__cpu0_per_cpu = .;
   . = . + PERCPU_PAGE_SIZE;	/* cpu0 per-cpu space */
 #endif
+		INIT_TASK_DATA(PAGE_SIZE)
+		CACHELINE_ALIGNED_DATA(SMP_CACHE_BYTES)
+		READ_MOSTLY_DATA(SMP_CACHE_BYTES)
 		DATA_DATA
 		*(.data1)
 		*(.gnu.linkonce.d*)
@@ -274,48 +222,15 @@ SECTIONS
   .sdata : AT(ADDR(.sdata) - LOAD_OFFSET)
 	{ *(.sdata) *(.sdata1) *(.srdata) }
   _edata  =  .;
-  __bss_start = .;
-  .sbss : AT(ADDR(.sbss) - LOAD_OFFSET)
-	{ *(.sbss) *(.scommon) }
-  .bss : AT(ADDR(.bss) - LOAD_OFFSET)
-	{ *(.bss) *(COMMON) }
-  __bss_stop = .;
+
+  BSS_SECTION(0, 0, 0)
 
   _end = .;
 
   code : { } :code
-  /* Stabs debugging sections.  */
-  .stab 0 : { *(.stab) }
-  .stabstr 0 : { *(.stabstr) }
-  .stab.excl 0 : { *(.stab.excl) }
-  .stab.exclstr 0 : { *(.stab.exclstr) }
-  .stab.index 0 : { *(.stab.index) }
-  .stab.indexstr 0 : { *(.stab.indexstr) }
-  /* DWARF debug sections.
-     Symbols in the DWARF debugging sections are relative to the beginning
-     of the section so we begin them at 0.  */
-  /* DWARF 1 */
-  .debug          0 : { *(.debug) }
-  .line           0 : { *(.line) }
-  /* GNU DWARF 1 extensions */
-  .debug_srcinfo  0 : { *(.debug_srcinfo) }
-  .debug_sfnames  0 : { *(.debug_sfnames) }
-  /* DWARF 1.1 and DWARF 2 */
-  .debug_aranges  0 : { *(.debug_aranges) }
-  .debug_pubnames 0 : { *(.debug_pubnames) }
-  /* DWARF 2 */
-  .debug_info     0 : { *(.debug_info) }
-  .debug_abbrev   0 : { *(.debug_abbrev) }
-  .debug_line     0 : { *(.debug_line) }
-  .debug_frame    0 : { *(.debug_frame) }
-  .debug_str      0 : { *(.debug_str) }
-  .debug_loc      0 : { *(.debug_loc) }
-  .debug_macinfo  0 : { *(.debug_macinfo) }
-  /* SGI/MIPS DWARF 2 extensions */
-  .debug_weaknames 0 : { *(.debug_weaknames) }
-  .debug_funcnames 0 : { *(.debug_funcnames) }
-  .debug_typenames 0 : { *(.debug_typenames) }
-  .debug_varnames  0 : { *(.debug_varnames) }
+
+  STABS_DEBUG
+  DWARF_DEBUG
 
   /* Default discards */
   DISCARDS