linux/kernel.h: import DIV_ROUND_{DOWN, UP}_ULL from Linux

Message ID 1505297804-26648-1-git-send-email-yamada.masahiro@socionext.com
State New
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  • linux/kernel.h: import DIV_ROUND_{DOWN, UP}_ULL from Linux
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Commit Message

Masahiro Yamada Sept. 13, 2017, 10:16 a.m.
These macros are useful to avoid link error on 32-bit systems.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

 include/linux/kernel.h | 5 +++++
 1 file changed, 5 insertions(+)

Patch

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 0b61671..87d2d95 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -57,6 +57,11 @@ 
 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 
+#define DIV_ROUND_DOWN_ULL(ll, d) \
+	({ unsigned long long _tmp = (ll); do_div(_tmp, d); _tmp; })
+
+#define DIV_ROUND_UP_ULL(ll, d)		DIV_ROUND_DOWN_ULL((ll) + (d) - 1, (d))
+
 #if BITS_PER_LONG == 32
 # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d)
 #else