63 lines
1.8 KiB
Diff
63 lines
1.8 KiB
Diff
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From 975dcf140bd307b431aff7b6d671155c796cfe5e Mon Sep 17 00:00:00 2001
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From: Laura Abbott <labbott@redhat.com>
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Date: Sat, 28 Jan 2017 16:13:49 +0100
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Subject: [PATCH] Work around for gcc7 and arm64
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Originally proposed by Will Deacon <will.deacon@arm.com>
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http://lists.infradead.org/pipermail/linux-arm-kernel/2016-October/462224.html
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Signed-off-by: Laura Abbott <labbott@redhat.com>
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---
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include/linux/log2.h | 13 ++-----------
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1 file changed, 2 insertions(+), 11 deletions(-)
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diff --git a/include/linux/log2.h b/include/linux/log2.h
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index fd7ff3d91e6a..1ab22b79681e 100644
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--- a/include/linux/log2.h
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+++ b/include/linux/log2.h
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@@ -16,12 +16,6 @@
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#include <linux/bitops.h>
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/*
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- * deal with unrepresentable constant logarithms
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- */
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-extern __attribute__((const, noreturn))
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-int ____ilog2_NaN(void);
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-
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-/*
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* non-constant log of base 2 calculators
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* - the arch may override these in asm/bitops.h if they can be implemented
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* more efficiently than using fls() and fls64()
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@@ -85,7 +79,7 @@ unsigned long __rounddown_pow_of_two(unsigned long n)
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#define ilog2(n) \
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( \
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__builtin_constant_p(n) ? ( \
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- (n) < 1 ? ____ilog2_NaN() : \
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+ (n) < 1 ? 0 : \
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(n) & (1ULL << 63) ? 63 : \
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(n) & (1ULL << 62) ? 62 : \
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(n) & (1ULL << 61) ? 61 : \
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@@ -149,9 +143,7 @@ unsigned long __rounddown_pow_of_two(unsigned long n)
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(n) & (1ULL << 3) ? 3 : \
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(n) & (1ULL << 2) ? 2 : \
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(n) & (1ULL << 1) ? 1 : \
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- (n) & (1ULL << 0) ? 0 : \
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- ____ilog2_NaN() \
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- ) : \
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+ 0 ) : \
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(sizeof(n) <= 4) ? \
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__ilog2_u32(n) : \
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__ilog2_u64(n) \
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@@ -194,7 +186,6 @@ unsigned long __rounddown_pow_of_two(unsigned long n)
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* @n: parameter
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*
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* The first few values calculated by this routine:
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- * ob2(0) = 0
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* ob2(1) = 0
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* ob2(2) = 1
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* ob2(3) = 2
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--
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2.11.0
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