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[dpdk-dev,v2,03/24] rte_common.h: cast gcc builtin result to avoid complaints

Message ID 152600394955.54839.13349425127968285666.stgit@localhost.localdomain (mailing list archive)
State Superseded, archived
Delegated to: Thomas Monjalon
Headers show


Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation success Compilation OK

Commit Message

Andy Green May 11, 2018, 1:59 a.m. UTC
warning: conversion to 'uint32_t' {aka 'unsigned int'} from
'int' may change the sign of the result [-Wsign-conversion]
  return __builtin_ctz(v);

The builtin is defined to return int, but we want to
return it as uint32_t.  Its only defined valid return
values are positive integers or zero, which is OK for
uint32_t.  So just add an explicit cast.

Signed-off-by: Andy Green <andy@warmcat.com>
 lib/librte_eal/common/include/rte_common.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h
index 69e5ed1e3..679f2f184 100644
--- a/lib/librte_eal/common/include/rte_common.h
+++ b/lib/librte_eal/common/include/rte_common.h
@@ -413,7 +413,7 @@  rte_align64prevpow2(uint64_t v)
 static inline uint32_t
 rte_bsf32(uint32_t v)
-	return __builtin_ctz(v);
+	return (uint32_t)__builtin_ctz(v);