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authorYury Norov <yury.norov@gmail.com>2022-09-15 05:07:28 +0300
committerYury Norov <yury.norov@gmail.com>2022-09-21 22:17:18 +0300
commit14a99e130f2758bc826a7e7a8bdf6f7400b54f0f (patch)
tree3b067dad53502e8e00c0fce608fe3b2587f2be91 /include/linux/find.h
parent58414bbb58a8b49af20e3accae56f6f8344b2424 (diff)
downloadlinux-14a99e130f2758bc826a7e7a8bdf6f7400b54f0f.tar.xz
lib/find_bit: create find_first_zero_bit_le()
find_first_zero_bit_le() is an alias to find_next_zero_bit_le(), despite that 'next' is known to be slower than 'first' version. Now that we have common FIND_FIRST_BIT() macro helper, it's trivial to implement find_first_zero_bit_le() as a real function. Reviewed-by: Valentin Schneider <vschneid@redhat.com> Signed-off-by: Yury Norov <yury.norov@gmail.com>
Diffstat (limited to 'include/linux/find.h')
-rw-r--r--include/linux/find.h23
1 files changed, 18 insertions, 5 deletions
diff --git a/include/linux/find.h b/include/linux/find.h
index 424ef67d4a42..2464bff5de04 100644
--- a/include/linux/find.h
+++ b/include/linux/find.h
@@ -17,6 +17,10 @@ extern unsigned long _find_first_and_bit(const unsigned long *addr1,
extern unsigned long _find_first_zero_bit(const unsigned long *addr, unsigned long size);
extern unsigned long _find_last_bit(const unsigned long *addr, unsigned long size);
+#ifdef __BIG_ENDIAN
+unsigned long _find_first_zero_bit_le(const unsigned long *addr, unsigned long size);
+#endif
+
#ifndef find_next_bit
/**
* find_next_bit - find the next set bit in a memory region
@@ -251,6 +255,20 @@ unsigned long find_next_zero_bit_le(const void *addr, unsigned
}
#endif
+#ifndef find_first_zero_bit_le
+static inline
+unsigned long find_first_zero_bit_le(const void *addr, unsigned long size)
+{
+ if (small_const_nbits(size)) {
+ unsigned long val = swab(*(const unsigned long *)addr) | ~GENMASK(size - 1, 0);
+
+ return val == ~0UL ? size : ffz(val);
+ }
+
+ return _find_first_zero_bit_le(addr, size);
+}
+#endif
+
#ifndef find_next_bit_le
static inline
unsigned long find_next_bit_le(const void *addr, unsigned
@@ -270,11 +288,6 @@ unsigned long find_next_bit_le(const void *addr, unsigned
}
#endif
-#ifndef find_first_zero_bit_le
-#define find_first_zero_bit_le(addr, size) \
- find_next_zero_bit_le((addr), (size), 0)
-#endif
-
#else
#error "Please fix <asm/byteorder.h>"
#endif