Xtensa fixes for 4.11-rc6

- make __pa work with uncached KSEG addresses, it fixes DMA memory
   mmapping and DMA debug;
 - fix torn stack dump output;
 - wire up statx syscall.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABAgAGBQJY4tpmAAoJEFH5zJH4P6BECVsP/0VW0w0rwPS22zy0hRHQP3BQ
 QEUDK7H9X1e8DWV4rEC47mSg4IYAJD8CTGsbsMHrBLm7krgbj4WZnkcuAuW+keH9
 pjgY2jhn0a84MHIk/ubtya/L0HfjmDfEm41VAWg0uqVg+NspENxgdGJSq88eCEU7
 up3KiM2/pBrgNiCejo6Nm8+Ct/fNMY0sgPAd83SoPdlMZY22K97NqBobdkoF43kR
 KH7BqAncSIBjUnYEtxlLjqs83GVnAwDBffVObL8JEHrodV6Mmbuut3rS4buCr2xW
 MZUfyWYQOuPRWLGhPZ49tFFfHakkfoOg3jLteU7FyOvX/tIPGh9jLA86ZIm7Eu+H
 RuAdhr6gTvQfuHx+XSguANKaRG67mkPICNusGUd5/prdIU65StQYzxh+lzkCP4SE
 UDlzbwLz9/9wiC/m6k+8outytcv89WqUtWq4l3sTc0X6SUIiMna2EDYLwV9aGELQ
 Gj/3AGMSAdUsJksUBFmLJ+eT4o7ujzsonZO0aMh3IpnhnnlCbV3x/4QlVLlAyjRJ
 Dp7v+++/iMkeczqtMka8ijfuOxjS0T55e4XyTfaHODYv2ai76G0K7wfu6TTwQDf6
 4BKBxxg/SKYkOwbBAcCvQzhX7AJ18hkZaXioDuRT+7uK+ljyUMfFvF8e44yL0RVl
 AeVWbXAXBwpw6PZOEnRo
 =lq7n
 -----END PGP SIGNATURE-----

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

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) \

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

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;
 }