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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 06/11] tools/kernel.h: add BUILD_BUG_ON_NOT_POWER_OF_2 macro
Date: Mon, 17 Feb 2020 21:41:28 -0500	[thread overview]
Message-ID: <20200218024133.5059-7-sashal@kernel.org> (raw)
In-Reply-To: <20200218024133.5059-1-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


  parent reply	other threads:[~2020-02-18  2:42 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-18  2:41 [PATCH 00/11] Fix up liblockdep for 5.6-rc Sasha Levin
2020-02-18  2:41 ` [PATCH 01/11] tools headers: Add kprobes.h header Sasha Levin
2020-02-18  2:41 ` [PATCH 02/11] tools headers: Add rcupdate.h header Sasha Levin
2020-02-18  2:41 ` [PATCH 03/11] tools/kernel.h: extend with dummy RCU functions Sasha Levin
2020-02-18  2:41 ` [PATCH 04/11] tools bitmap: add bitmap_andnot definition Sasha Levin
2020-02-18  2:41 ` [PATCH 05/11] tools/lib/lockdep: add definition required for IRQ flag tracing Sasha Levin
2020-02-18  2:41 ` Sasha Levin [this message]
2020-02-18  2:41 ` [PATCH 07/11] tools bitmap: add bitmap_clear definition Sasha Levin
2020-02-18  2:41 ` [PATCH 08/11] tools/lib/lockdep: Hook up vsprintf, find_bit, hweight libraries Sasha Levin
2020-02-18  2:41 ` [PATCH 09/11] tools/lib/lockdep: Enable building with CONFIG_TRACE_IRQFLAGS Sasha Levin
2020-02-18  2:41 ` [PATCH 10/11] tools/lib/lockdep: New stacktrace API Sasha Levin
2020-02-18  2:41 ` [PATCH 11/11] tools/lib/lockdep: call lockdep_init_task on init Sasha Levin

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