Merge tag 'xtensa-20170403' of git://github.com/jcmvbkbc/linux-xtensa

Pull Xtensa fixes from Max Filippov:

 - make __pa work with uncached KSEG addresses, it fixes DMA memory
   mmapping and DMA debug

 - fix torn stack dump output

 - wire up statx syscall

* tag 'xtensa-20170403' of git://github.com/jcmvbkbc/linux-xtensa:
  xtensa: wire up statx system call
  xtensa: fix stack dump output
  xtensa: make __pa work with uncached KSEG addresses

3 files changed, 19 insertions, 5 deletions

diff --git a/arch/xtensa/include/asm/page.h b/arch/xtensa/include/asm/page.h
index 976b1d70edbc..4ddbfd57a7c8 100644
--- a/arch/xtensa/include/asm/page.h
+++ b/arch/xtensa/include/asm/page.h
@@ -164,8 +164,21 @@ void copy_user_highpage(struct page *to, struct page *from,
 
 #define ARCH_PFN_OFFSET         (PHYS_OFFSET >> PAGE_SHIFT)
 
+#ifdef CONFIG_MMU
+static inline unsigned long ___pa(unsigned long va)
+{
+        unsigned long off = va - PAGE_OFFSET;
+
+        if (off >= XCHAL_KSEG_SIZE)
+                off -= XCHAL_KSEG_SIZE;
+
+        return off + PHYS_OFFSET;
+}
+#define __pa(x) ___pa((unsigned long)(x))
+#else
 #define __pa(x) \
         ((unsigned long) (x) - PAGE_OFFSET + PHYS_OFFSET)
+#endif
 #define __va(x) \
         ((void *)((unsigned long) (x) - PHYS_OFFSET + PAGE_OFFSET))
 #define pfn_valid(pfn) \
diff --git a/arch/xtensa/include/uapi/asm/unistd.h b/arch/xtensa/include/uapi/asm/unistd.h
index cd400af4a6b2..6be7eb27fd29 100644
--- a/arch/xtensa/include/uapi/asm/unistd.h
+++ b/arch/xtensa/include/uapi/asm/unistd.h
@@ -774,7 +774,10 @@ __SYSCALL(349, sys_pkey_alloc, 2)
 #define __NR_pkey_free                          350
 __SYSCALL(350, sys_pkey_free, 1)
 
-#define __NR_syscall_count                      351
+#define __NR_statx                              351
+__SYSCALL(351, sys_statx, 5)
+
+#define __NR_syscall_count                      352
 
 /*
  * sysxtensa syscall handler
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index c82c43bff296..bae697a06a98 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -483,10 +483,8 @@ void show_regs(struct pt_regs * regs)
 
 static int show_trace_cb(struct stackframe *frame, void *data)
 {
-        if (kernel_text_address(frame->pc)) {
-                pr_cont(" [<%08lx>]", frame->pc);
-                print_symbol(" %s\n", frame->pc);
-        }
+        if (kernel_text_address(frame->pc))
+                pr_cont(" [<%08lx>] %pB\n", frame->pc, (void *)frame->pc);
         return 0;
 }