Merge branch 'parisc-4.9-2' of git://git.kernel.org/pub/scm/linux/ker…

…nel/git/deller/parisc-linux

Pull parisc fixes from Helge Deller:
 "Some final updates and fixes for this merge window for the parisc
  architecture. Changes include:

   - Fix boot problems with new memblock allocator on rp3410 machine

   - Increase initial kernel mapping size for 32- and 64-bit kernels,
     this allows to boot bigger kernels which have many modules built-in

   - Fix kernel layout regarding __gp and move exception table into RO
     section

   - Show trap names in crashes, use extable.h header instead of
     module.h"

* 'parisc-4.9-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: Show trap name in kernel crash
  parisc: Zero-initialize newly alloced memblock
  parisc: Move exception table into read-only section
  parisc: Fix kernel memory layout regarding position of __gp
  parisc: Increase initial kernel mapping size
  parisc: Migrate exception table users off module.h and onto extable.h

arch/parisc/include/asm/pgtable.h

@@ -83,10 +83,10 @@ static inline void purge_tlb_entries(struct mm_struct *mm, unsigned long addr)
 	printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, (unsigned long)pgd_val(e))
 
 /* This is the size of the initially mapped kernel memory */
-#if defined(CONFIG_64BIT) || defined(CONFIG_SMP)
-#define KERNEL_INITIAL_ORDER	25	/* 1<<25 = 32MB */
+#if defined(CONFIG_64BIT)
+#define KERNEL_INITIAL_ORDER	26	/* 1<<26 = 64MB */
 #else
-#define KERNEL_INITIAL_ORDER	24	/* 1<<24 = 16MB */
+#define KERNEL_INITIAL_ORDER	25	/* 1<<25 = 32MB */
 #endif
 #define KERNEL_INITIAL_SIZE	(1 << KERNEL_INITIAL_ORDER)
 

arch/parisc/include/asm/traps.h

@@ -11,6 +11,7 @@ void parisc_terminate(char *msg, struct pt_regs *regs,
 void die_if_kernel(char *str, struct pt_regs *regs, long err);
 
 /* mm/fault.c */
+const char *trap_name(unsigned long code);
 void do_page_fault(struct pt_regs *regs, unsigned long code,
 		unsigned long address);
 #endif

arch/parisc/kernel/traps.c

@@ -458,8 +458,8 @@ void parisc_terminate(char *msg, struct pt_regs *regs, int code, unsigned long o
 	}
 
 	printk("\n");
-	printk(KERN_CRIT "%s: Code=%d regs=%p (Addr=" RFMT ")\n",
-			msg, code, regs, offset);
+	pr_crit("%s: Code=%d (%s) regs=%p (Addr=" RFMT ")\n",
+		msg, code, trap_name(code), regs, offset);
 	show_regs(regs);
 
 	spin_unlock(&terminate_lock);

arch/parisc/kernel/vmlinux.lds.S

@@ -90,8 +90,9 @@ SECTIONS
 	/* Start of data section */
 	_sdata = .;
 
-	RO_DATA_SECTION(8)
-
+	/* Architecturally we need to keep __gp below 0x1000000 and thus
+	 * in front of RO_DATA_SECTION() which stores lots of tracepoint
+	 * and ftrace symbols. */
 #ifdef CONFIG_64BIT
 	. = ALIGN(16);
 	/* Linkage tables */
@@ -106,6 +107,12 @@ SECTIONS
 	}
 #endif
 
+	RO_DATA_SECTION(8)
+
+	/* RO because of BUILDTIME_EXTABLE_SORT */
+	EXCEPTION_TABLE(8)
+	NOTES
+
 	/* unwind info */
 	.PARISC.unwind : {
 		__start___unwind = .;
@@ -121,9 +128,6 @@ SECTIONS
 	. = ALIGN(HUGEPAGE_SIZE);
 	data_start = .;
 
-	EXCEPTION_TABLE(8)
-	NOTES
-
 	/* Data */
 	RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, PAGE_SIZE)
 

arch/parisc/mm/fault.c

@@ -14,7 +14,7 @@
 #include <linux/ptrace.h>
 #include <linux/sched.h>
 #include <linux/interrupt.h>
-#include <linux/module.h>
+#include <linux/extable.h>
 #include <linux/uaccess.h>
 
 #include <asm/traps.h>
@@ -204,6 +204,16 @@ static const char * const trap_description[] = {
 	[28] "Unaligned data reference trap",
 };
 
+const char *trap_name(unsigned long code)
+{
+	const char *t = NULL;
+
+	if (code < ARRAY_SIZE(trap_description))
+		t = trap_description[code];
+
+	return t ? t : "Unknown trap";
+}
+
 /*
  * Print out info about fatal segfaults, if the show_unhandled_signals
  * sysctl is set:
@@ -213,8 +223,6 @@ show_signal_msg(struct pt_regs *regs, unsigned long code,
 		unsigned long address, struct task_struct *tsk,
 		struct vm_area_struct *vma)
 {
-	const char *trap_name = NULL;
-
 	if (!unhandled_signal(tsk, SIGSEGV))
 		return;
 
@@ -226,10 +234,7 @@ show_signal_msg(struct pt_regs *regs, unsigned long code,
 	    tsk->comm, code, address);
 	print_vma_addr(KERN_CONT " in ", regs->iaoq[0]);
 
-	if (code < ARRAY_SIZE(trap_description))
-		trap_name = trap_description[code];
-	pr_warn(KERN_CONT " trap #%lu: %s%c", code,
-		trap_name ? trap_name : "unknown",
+	pr_cont(" trap #%lu: %s%c", code, trap_name(code),
 		vma ? ',':'\n');
 
 	if (vma)

arch/parisc/mm/init.c

@@ -105,6 +105,8 @@ static void * __init get_memblock(unsigned long size)
 	else
 		panic("get_memblock() failed.\n");
 
+	memset(__va(phys), 0, size);
+
 	return __va(phys);
 }