Merge branch 'linus' into timers/nohz

5 files changed, 64 insertions, 56 deletions

diff --git a/arch/avr32/kernel/entry-avr32b.S b/arch/avr32/kernel/entry-avr32b.S
index 5f31702..2b398ca 100644
--- a/arch/avr32/kernel/entry-avr32b.S
+++ b/arch/avr32/kernel/entry-avr32b.S
@@ -74,50 +74,41 @@ exception_vectors:
 	.align	2
 	bral	do_dtlb_modified
 
-	/*
-	 * r0 :	PGD/PT/PTE
-	 * r1 : Offending address
-	 * r2 : Scratch register
-	 * r3 : Cause (5, 12 or 13)
-	 */
 #define	tlbmiss_save	pushm	r0-r3
 #define tlbmiss_restore	popm	r0-r3
 
-	.section .tlbx.ex.text,"ax",@progbits
+	.org	0x50
 	.global	itlb_miss
 itlb_miss:
 	tlbmiss_save
 	rjmp	tlb_miss_common
 
-	.section .tlbr.ex.text,"ax",@progbits
+	.org	0x60
 dtlb_miss_read:
 	tlbmiss_save
 	rjmp	tlb_miss_common
 
-	.section .tlbw.ex.text,"ax",@progbits
+	.org	0x70
 dtlb_miss_write:
 	tlbmiss_save
 
 	.global	tlb_miss_common
+	.align	2
 tlb_miss_common:
 	mfsr	r0, SYSREG_TLBEAR
 	mfsr	r1, SYSREG_PTBR
 
-	/* Is it the vmalloc space? */
-	bld	r0, 31
-	brcs	handle_vmalloc_miss
-
-	/* First level lookup */
+	/*
+	 * First level lookup: The PGD contains virtual pointers to
+	 * the second-level page tables, but they may be NULL if not
+	 * present.
+	 */
 pgtbl_lookup:
 	lsr	r2, r0, PGDIR_SHIFT
 	ld.w	r3, r1[r2 << 2]
 	bfextu	r1, r0, PAGE_SHIFT, PGDIR_SHIFT - PAGE_SHIFT
-	bld	r3, _PAGE_BIT_PRESENT
-	brcc	page_table_not_present
-
-	/* Translate to virtual address in P1. */
-	andl	r3, 0xf000
-	sbr	r3, 31
+	cp.w	r3, 0
+	breq	page_table_not_present
 
 	/* Second level lookup */
 	ld.w	r2, r3[r1 << 2]
@@ -148,16 +139,55 @@ pgtbl_lookup:
 	tlbmiss_restore
 	rete
 
-handle_vmalloc_miss:
-	/* Simply do the lookup in init's page table */
+	/* The slow path of the TLB miss handler */
+	.align	2
+page_table_not_present:
+	/* Do we need to synchronize with swapper_pg_dir? */
+	bld	r0, 31
+	brcs	sync_with_swapper_pg_dir
+
+page_not_present:
+	tlbmiss_restore
+	sub	sp, 4
+	stmts	--sp, r0-lr
+	rcall	save_full_context_ex
+	mfsr	r12, SYSREG_ECR
+	mov	r11, sp
+	rcall	do_page_fault
+	rjmp	ret_from_exception
+
+	.align	2
+sync_with_swapper_pg_dir:
+	/*
+	 * If swapper_pg_dir contains a non-NULL second-level page
+	 * table pointer, copy it into the current PGD. If not, we
+	 * must handle it as a full-blown page fault.
+	 *
+	 * Jumping back to pgtbl_lookup causes an unnecessary lookup,
+	 * but it is guaranteed to be a cache hit, it won't happen
+	 * very often, and we absolutely do not want to sacrifice any
+	 * performance in the fast path in order to improve this.
+	 */
 	mov	r1, lo(swapper_pg_dir)
 	orh	r1, hi(swapper_pg_dir)
+	ld.w	r3, r1[r2 << 2]
+	cp.w	r3, 0
+	breq	page_not_present
+	mfsr	r1, SYSREG_PTBR
+	st.w	r1[r2 << 2], r3
 	rjmp	pgtbl_lookup
 
+	/*
+	 * We currently have two bytes left at this point until we
+	 * crash into the system call handler...
+	 *
+	 * Don't worry, the assembler will let us know.
+	 */
+
 
 	/* ---                    System Call                    --- */
 
-	.section .scall.text,"ax",@progbits
+	.org	0x100
 system_call:
 #ifdef CONFIG_PREEMPT
 	mask_interrupts
@@ -266,18 +296,6 @@ syscall_exit_work:
 	brcc	syscall_exit_cont
 	rjmp	enter_monitor_mode
 
-	/* The slow path of the TLB miss handler */
-page_table_not_present:
-page_not_present:
-	tlbmiss_restore
-	sub	sp, 4
-	stmts	--sp, r0-lr
-	rcall	save_full_context_ex
-	mfsr	r12, SYSREG_ECR
-	mov	r11, sp
-	rcall	do_page_fault
-	rjmp	ret_from_exception
-
 	/* This function expects to find offending PC in SYSREG_RAR_EX */
 	.type	save_full_context_ex, @function
 	.align	2
diff --git a/arch/avr32/kernel/signal.c b/arch/avr32/kernel/signal.c
index 5616a00..c5b11f9 100644
--- a/arch/avr32/kernel/signal.c
+++ b/arch/avr32/kernel/signal.c
@@ -93,6 +93,9 @@ asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
 	if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
 		goto badframe;
 
+	if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT)
+		goto badframe;
+
 	pr_debug("Context restored: pc = %08lx, lr = %08lx, sp = %08lx\n",
 		 regs->pc, regs->lr, regs->sp);
 
diff --git a/arch/avr32/kernel/stacktrace.c b/arch/avr32/kernel/stacktrace.c
index 9a68190..f4bdb44 100644
--- a/arch/avr32/kernel/stacktrace.c
+++ b/arch/avr32/kernel/stacktrace.c
@@ -51,3 +51,4 @@ void save_stack_trace(struct stack_trace *trace)
 		fp = frame->fp;
 	}
 }
+EXPORT_SYMBOL_GPL(save_stack_trace);
diff --git a/arch/avr32/kernel/time.c b/arch/avr32/kernel/time.c
index 00a9862..abd954f 100644
--- a/arch/avr32/kernel/time.c
+++ b/arch/avr32/kernel/time.c
@@ -7,21 +7,13 @@
  */
 #include <linux/clk.h>
 #include <linux/clockchips.h>
-#include <linux/time.h>
-#include <linux/module.h>
+#include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
-#include <linux/kernel_stat.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/profile.h>
-#include <linux/sysdev.h>
-#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
 
-#include <asm/div64.h>
 #include <asm/sysreg.h>
-#include <asm/io.h>
-#include <asm/sections.h>
 
 #include <asm/arch/pm.h>
 
diff --git a/arch/avr32/kernel/vmlinux.lds.S b/arch/avr32/kernel/vmlinux.lds.S
index 481cfd4..7910d41 100644
--- a/arch/avr32/kernel/vmlinux.lds.S
+++ b/arch/avr32/kernel/vmlinux.lds.S
@@ -68,14 +68,6 @@ SECTIONS
 		_evba = .;
 		_text = .;
 		*(.ex.text)
-		. = 0x50;
-		*(.tlbx.ex.text)
-		. = 0x60;
-		*(.tlbr.ex.text)
-		. = 0x70;
-		*(.tlbw.ex.text)
-		. = 0x100;
-		*(.scall.text)
 		*(.irq.text)
 		KPROBES_TEXT
 		TEXT_TEXT
@@ -93,8 +85,6 @@ SECTIONS
 		__stop___ex_table = .;
 	}
 
-	BUG_TABLE
-
 	RODATA
 
 	. = ALIGN(THREAD_SIZE);
@@ -107,6 +97,10 @@ SECTIONS
 		 */
 		*(.data.init_task)
 
+		/* Then, the page-aligned data */
+		. = ALIGN(PAGE_SIZE);
+		*(.data.page_aligned)
+
 		/* Then, the cacheline aligned data */
 		. = ALIGN(L1_CACHE_BYTES);
 		*(.data.cacheline_aligned)