Merge tag 'xtensa-next-20130225' of git://github.com/czankel/xtensa-linux

Pull xtensa update from Chris Zankel:
 "Added features:
   - add support for thread local storage (TLS)

   - add accept4 and finit_module syscalls

   - support medium-priority interrupts

   - add support for dc232c processor variant

   - support file-base simulated disk for ISS simulator

  Bug fixes:

   - fix return values returned by the str[n]cmp functions

   - avoid mmap cache aliasing

   - fix handling of 'windowed registers' in ptrace"

* tag 'xtensa-next-20130225' of git://github.com/czankel/xtensa-linux:
  xtensa: add accept4 syscall
  xtensa: add support for TLS
  xtensa: add missing include asm/uaccess.h to checksum.h
  xtensa: do not enable GENERIC_GPIO by default
  xtensa: complete ptrace handling of register windows
  xtensa: add support for oprofile
  xtensa: move spill_registers to traps.h
  xtensa: ISS: add host file-based simulated disk
  xtensa: fix str[n]cmp return value
  xtensa: avoid mmap cache aliasing
  xtensa: add finit_module syscall
  xtensa: pull signal definitions from signal-defs.h
  xtensa: fix ipc_parse_version selection
  xtensa: dispatch medium-priority interrupts
  xtensa: Add config files for Diamond 233L - Rev C processor variant
  xtensa: use new common dtc rule
  xtensa: rename prom_update_property to of_update_property

1 files changed, 41 insertions, 0 deletions

diff --git a/arch/xtensa/kernel/syscall.c b/arch/xtensa/kernel/syscall.c
index 54fa8425cee2..5d3f7a119ed1 100644
--- a/arch/xtensa/kernel/syscall.c
+++ b/arch/xtensa/kernel/syscall.c
@@ -36,6 +36,10 @@ syscall_t sys_call_table[__NR_syscall_count] /* FIXME __cacheline_aligned */= {
 #include <uapi/asm/unistd.h>
 };
 
+#define COLOUR_ALIGN(addr, pgoff) \
+	((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) + \
+	 (((pgoff) << PAGE_SHIFT) & (SHMLBA - 1)))
+
 asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg)
 {
 	unsigned long ret;
@@ -52,3 +56,40 @@ asmlinkage long xtensa_fadvise64_64(int fd, int advice,
 {
 	return sys_fadvise64_64(fd, offset, len, advice);
 }
+
+unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
+		unsigned long len, unsigned long pgoff, unsigned long flags)
+{
+	struct vm_area_struct *vmm;
+
+	if (flags & MAP_FIXED) {
+		/* We do not accept a shared mapping if it would violate
+		 * cache aliasing constraints.
+		 */
+		if ((flags & MAP_SHARED) &&
+				((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
+			return -EINVAL;
+		return addr;
+	}
+
+	if (len > TASK_SIZE)
+		return -ENOMEM;
+	if (!addr)
+		addr = TASK_UNMAPPED_BASE;
+
+	if (flags & MAP_SHARED)
+		addr = COLOUR_ALIGN(addr, pgoff);
+	else
+		addr = PAGE_ALIGN(addr);
+
+	for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
+		/* At this point:  (!vmm || addr < vmm->vm_end). */
+		if (TASK_SIZE - len < addr)
+			return -ENOMEM;
+		if (!vmm || addr + len <= vmm->vm_start)
+			return addr;
+		addr = vmm->vm_end;
+		if (flags & MAP_SHARED)
+			addr = COLOUR_ALIGN(addr, pgoff);
+	}
+}