From: Sasha Levin <sashal@kernel.org>
To: torvalds@linux-foundation.org
Cc: mingo@kernel.org, peterz@infradead.org,
linux-kernel@vger.kernel.org, Sasha Levin <sashal@kernel.org>
Subject: [PATCH v4 06/14] tools bitmap: add bitmap_clear definition
Date: Tue, 4 Aug 2020 20:10:35 -0400 [thread overview]
Message-ID: <20200805001043.3331907-7-sashal@kernel.org> (raw)
In-Reply-To: <20200805001043.3331907-1-sashal@kernel.org>
This is needed as a result of de4643a77356 ("locking/lockdep: Reuse lock
chains that have been freed").
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/lib/bitmap.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/tools/lib/bitmap.c b/tools/lib/bitmap.c
index b6bc037623fc1..873176c501e43 100644
--- a/tools/lib/bitmap.c
+++ b/tools/lib/bitmap.c
@@ -101,3 +101,23 @@ int __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1,
BITMAP_LAST_WORD_MASK(bits));
return result != 0;
}
+
+void bitmap_clear(unsigned long *map, unsigned int start, int len)
+{
+ unsigned long *p = map + BIT_WORD(start);
+ const unsigned int size = start + len;
+ int bits_to_clear = BITS_PER_LONG - (start % BITS_PER_LONG);
+ unsigned long mask_to_clear = BITMAP_FIRST_WORD_MASK(start);
+
+ while (len - bits_to_clear >= 0) {
+ *p &= ~mask_to_clear;
+ len -= bits_to_clear;
+ bits_to_clear = BITS_PER_LONG;
+ mask_to_clear = ~0UL;
+ p++;
+ }
+ if (len) {
+ mask_to_clear &= BITMAP_LAST_WORD_MASK(size);
+ *p &= ~mask_to_clear;
+ }
+}
--
2.25.1
next prev parent reply other threads:[~2020-08-05 0:11 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-05 0:10 [PATCH v4 00/14] liblockdep fixes for 5.9-rc1 Sasha Levin
2020-08-05 0:10 ` [PATCH v4 01/14] tools headers: Add kprobes.h header Sasha Levin
2020-08-05 0:10 ` [PATCH v4 02/14] tools headers: Add rcupdate.h header Sasha Levin
2020-08-05 0:10 ` [PATCH v4 03/14] tools/kernel.h: extend with dummy RCU functions Sasha Levin
2020-08-05 0:10 ` [PATCH v4 04/14] tools bitmap: add bitmap_andnot definition Sasha Levin
2020-08-05 0:10 ` [PATCH v4 05/14] tools/lib/lockdep: add definition required for IRQ flag tracing Sasha Levin
2020-08-05 0:10 ` Sasha Levin [this message]
2020-08-05 0:10 ` [PATCH v4 07/14] tools/lib/lockdep: Hook up vsprintf, find_bit, hweight libraries Sasha Levin
2020-08-05 0:10 ` [PATCH v4 08/14] tools/lib/lockdep: Enable building with CONFIG_TRACE_IRQFLAGS Sasha Levin
2020-08-05 0:10 ` [PATCH v4 09/14] tools/lib/lockdep: New stacktrace API Sasha Levin
2020-08-05 0:10 ` [PATCH v4 10/14] tools/lib/lockdep: call lockdep_init_task on init Sasha Levin
2020-08-05 0:10 ` [PATCH v4 11/14] tools/lib/lockdep: switch to using lockdep_init_map_waits Sasha Levin
2020-08-05 0:10 ` [PATCH v4 12/14] tools/kernel.h: hide noinstr Sasha Levin
2020-08-05 0:10 ` [PATCH v4 13/14] tools/lib/lockdep: explicitly declare lockdep_init_task() Sasha Levin
2020-08-05 0:10 ` [PATCH v4 14/14] tools/kernel.h: hide task_struct.hardirq_chain_key Sasha Levin
2020-08-06 8:09 ` [PATCH v4 00/14] liblockdep fixes for 5.9-rc1 Ingo Molnar
2020-08-07 22:25 ` Sasha Levin
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