linux-kernel - [PATCH v2 04/12] tools bitmap: add bitmap

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Message-Id: <20200419015754.24456-5-sashal@kernel.org>
Date:   Sat, 18 Apr 2020 21:57:46 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     mingo@...nel.org, peterz@...radead.org
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de, jolsa@...hat.com,
        alexey.budankov@...ux.intel.com, songliubraving@...com,
        acme@...hat.com, allison@...utok.net,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH v2 04/12] tools bitmap: add bitmap_andnot definition

Add definition of bitmap_andnot() and wire tools/lib/bitmap.c into
liblockdep.

This is needed as a result of de4643a77356 ("locking/lockdep: Reuse lock
chains that have been freed").

Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/include/linux/bitmap.h | 10 ++++++++++
 tools/lib/bitmap.c           | 15 +++++++++++++++
 tools/lib/lockdep/Build      |  2 +-
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/tools/include/linux/bitmap.h b/tools/include/linux/bitmap.h
index 477a1cae513f2..ab5df035f8eda 100644
--- a/tools/include/linux/bitmap.h
+++ b/tools/include/linux/bitmap.h
@@ -18,6 +18,8 @@ int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
 int __bitmap_equal(const unsigned long *bitmap1,
 		   const unsigned long *bitmap2, unsigned int bits);
 void bitmap_clear(unsigned long *map, unsigned int start, int len);
+int __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1,
+			const unsigned long *bitmap2, unsigned int bits);
 
 #define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
 
@@ -178,4 +180,12 @@ static inline int bitmap_equal(const unsigned long *src1,
 	return __bitmap_equal(src1, src2, nbits);
 }
 
+static inline int bitmap_andnot(unsigned long *dst, const unsigned long *src1,
+                        const unsigned long *src2, unsigned int nbits)
+{
+	if (small_const_nbits(nbits))
+		return (*dst = *src1 & ~(*src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0;
+	return __bitmap_andnot(dst, src1, src2, nbits);
+}
+
 #endif /* _PERF_BITOPS_H */
diff --git a/tools/lib/bitmap.c b/tools/lib/bitmap.c
index 5043747ef6c5f..b6bc037623fc1 100644
--- a/tools/lib/bitmap.c
+++ b/tools/lib/bitmap.c
@@ -86,3 +86,18 @@ int __bitmap_equal(const unsigned long *bitmap1,
 
 	return 1;
 }
+
+int __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1,
+                                const unsigned long *bitmap2, unsigned int bits)
+{
+	unsigned int k;
+	unsigned int lim = bits/BITS_PER_LONG;
+	unsigned long result = 0;
+
+	for (k = 0; k < lim; k++)
+		result |= (dst[k] = bitmap1[k] & ~bitmap2[k]);
+	if (bits % BITS_PER_LONG)
+		result |= (dst[k] = bitmap1[k] & ~bitmap2[k] &
+			BITMAP_LAST_WORD_MASK(bits));
+	return result != 0;
+}
diff --git a/tools/lib/lockdep/Build b/tools/lib/lockdep/Build
index 6f667355b0687..219a9e2d9e0ba 100644
--- a/tools/lib/lockdep/Build
+++ b/tools/lib/lockdep/Build
@@ -1 +1 @@
-liblockdep-y += common.o lockdep.o preload.o rbtree.o
+liblockdep-y += common.o lockdep.o preload.o rbtree.o ../../lib/bitmap.o
-- 
2.20.1