* [PATCH v2 3/8] bitops/find.h: Add declaration find_last_zero_bit
@ 2020-12-06 6:47 Levi Yun
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From: Levi Yun @ 2020-12-06 6:47 UTC (permalink / raw)
To: akpm, yury.norov, andriy.shevchenko, richard.weiyang,
christian.brauner, arnd, jpoimboe, changbin.du, rdunlap,
masahiroy, gregkh, peterz, peter.enderborg, krzk, brendanhiggins,
keescook, broonie, matti.vaittinen, mhiramat, jpa, nivedita,
glider, orson.zhai, takahiro.akashi, clm, josef, dsterba,
dushistov
Cc: linux-kernel, linux-arch, linux-btrfs
Inspired find_next_*_bit function series, add find_last_zero_bit.
These patch adds declarations for find_last_zero_bit.
Also, I move declaration of find_last_bit to asm-generic/bitops/find.h
Because:
I think its declaration need not to in __KERNEL__ macro compared to
find_next_*_bit and find_first_*_bit.
Signed-off-by: Levi Yun <ppbuk5246@gmail.com>
---
include/asm-generic/bitops/find.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/include/asm-generic/bitops/find.h b/include/asm-generic/bitops/find.h
index 9fdf21302fdf..eeb2d6669f83 100644
--- a/include/asm-generic/bitops/find.h
+++ b/include/asm-generic/bitops/find.h
@@ -80,6 +80,31 @@ extern unsigned long find_first_zero_bit(const unsigned long *addr,
#endif /* CONFIG_GENERIC_FIND_FIRST_BIT */
+#ifndef find_last_bit
+/**
+ * find_last_bit - find the last set bit in a memory region
+ * @addr: The address to start the search at
+ * @size: The number of bits to search
+ *
+ * Returns the bit number of the last set bit, or size.
+ */
+extern unsigned long find_last_bit(const unsigned long *addr,
+ unsigned long size);
+#endif
+
+#ifndef find_last_zero_bit
+/**
+ * find_last_zero_bit - find the last cleared bit in a memory region
+ * @addr: The address to start the search at
+ * @size: The maximum number of bits to search
+ *
+ * Returns the bit number of the first cleared bit.
+ * If no bits are zero, returns @size.
+ */
+extern unsigned long find_last_zero_bit(const unsigned long *addr,
+ unsigned long size);
+#endif
+
/**
* find_next_clump8 - find next 8-bit clump with set bits in a memory region
* @clump: location to store copy of found clump
--
2.27.0
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