From: Sasha Levin <sashal@kernel.org>
To: mingo@kernel.org, peterz@infradead.org
Cc: linux-kernel@vger.kernel.org, tglx@linutronix.de,
jolsa@redhat.com, alexey.budankov@linux.intel.com,
songliubraving@fb.com, acme@redhat.com, allison@lohutok.net,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH v2 06/12] tools/kernel.h: add BUILD_BUG_ON_NOT_POWER_OF_2 macro
Date: Sat, 18 Apr 2020 21:57:48 -0400 [thread overview]
Message-ID: <20200419015754.24456-7-sashal@kernel.org> (raw)
In-Reply-To: <20200419015754.24456-1-sashal@kernel.org>
This is now needed as a result of 12593b7467f9 ("locking/lockdep: Reduce
space occupied by stack traces").
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/include/linux/kernel.h | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/tools/include/linux/kernel.h b/tools/include/linux/kernel.h
index d2b3e1cc0218e..cc3d60623ca47 100644
--- a/tools/include/linux/kernel.h
+++ b/tools/include/linux/kernel.h
@@ -38,6 +38,12 @@
#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
+/* Force a compilation error if a constant expression is not a power of 2 */
+#define __BUILD_BUG_ON_NOT_POWER_OF_2(n) \
+ BUILD_BUG_ON(((n) & ((n) - 1)) != 0)
+#define BUILD_BUG_ON_NOT_POWER_OF_2(n) \
+ BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
+
#ifndef max
#define max(x, y) ({ \
typeof(x) _max1 = (x); \
--
2.20.1
next prev parent reply other threads:[~2020-04-19 1:58 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-19 1:57 [PATCH v2 00/12] Fix up liblockdep for 5.7-rc Sasha Levin
2020-04-19 1:57 ` [PATCH v2 01/12] tools headers: Add kprobes.h header Sasha Levin
2020-04-19 1:57 ` [PATCH v2 02/12] tools headers: Add rcupdate.h header Sasha Levin
2020-04-19 1:57 ` [PATCH v2 03/12] tools/kernel.h: extend with dummy RCU functions Sasha Levin
2020-04-19 1:57 ` [PATCH v2 04/12] tools bitmap: add bitmap_andnot definition Sasha Levin
2020-04-19 1:57 ` [PATCH v2 05/12] tools/lib/lockdep: add definition required for IRQ flag tracing Sasha Levin
2020-04-19 1:57 ` Sasha Levin [this message]
2020-04-19 1:57 ` [PATCH v2 07/12] tools bitmap: add bitmap_clear definition Sasha Levin
2020-04-19 1:57 ` [PATCH v2 08/12] tools/lib/lockdep: Hook up vsprintf, find_bit, hweight libraries Sasha Levin
2020-04-19 1:57 ` [PATCH v2 09/12] tools/lib/lockdep: Enable building with CONFIG_TRACE_IRQFLAGS Sasha Levin
2020-04-19 1:57 ` [PATCH v2 10/12] tools/lib/lockdep: New stacktrace API Sasha Levin
2020-04-19 1:57 ` [PATCH v2 11/12] tools/lib/lockdep: call lockdep_init_task on init Sasha Levin
2020-04-19 1:57 ` [PATCH v2 12/12] tools/lib/lockdep: switch to using lockdep_init_map_waits Sasha Levin
2020-06-01 20:52 ` [PATCH v2 00/12] Fix up liblockdep for 5.7-rc Sasha Levin
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