Re: [RFC PATCH 1/5] powerpc/mm/slice: Convert slice_mask high slice to a bitmap

In followup patch we want to increase the va range which will result
in us requiring high_slices to have more than 64 bits. To enable this
convert high_slices to bitmap. We keep the number bits same in this patch
and later change that to larger value

Signed-off-by: Aneesh Kumar K.V <redacted>
---
 arch/powerpc/include/asm/page_64.h |  15 +++---
 arch/powerpc/mm/slice.c            | 106 ++++++++++++++++++++++++-------------
 2 files changed, 76 insertions(+), 45 deletions(-)

diff --git a/arch/powerpc/include/asm/page_64.h b/arch/powerpc/include/asm/page_64.h
index dd5f0712afa2..7f72659b7999 100644
--- a/arch/powerpc/include/asm/page_64.h
+++ b/arch/powerpc/include/asm/page_64.h

@@ -98,19 +98,16 @@ extern u64 ppc64_pft_size;
 #define GET_LOW_SLICE_INDEX(addr)	((addr) >> SLICE_LOW_SHIFT)
 #define GET_HIGH_SLICE_INDEX(addr)	((addr) >> SLICE_HIGH_SHIFT)
 
+#ifndef __ASSEMBLY__
 struct slice_mask {
 	u16 low_slices;

-	u64 high_slices;
+	DECLARE_BITMAP(high_slices, 64);
 };
 
 
 static void slice_print_mask(const char *label, struct slice_mask mask)
 {
-	char	*p, buf[16 + 3 + 64 + 1];
+	char	*p, buf[SLICE_NUM_LOW + 3 + SLICE_NUM_HIGH + 1];
 	int	i;
 
 	if (!_slice_debug)

@@ -60,8 +55,12 @@ static void slice_print_mask(const char *label, struct slice_mask mask)
 	*(p++) = ' ';
 	*(p++) = '-';
 	*(p++) = ' ';
-	for (i = 0; i < SLICE_NUM_HIGH; i++)
-		*(p++) = (mask.high_slices & (1ul << i)) ? '1' : '0';
+	for (i = 0; i < SLICE_NUM_HIGH; i++) {
+		if (test_bit(i, mask.high_slices))
+			*(p++) = '1';
+		else
+			*(p++) = '0';
+	}