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Date: Mon, 28 Aug 2023 19:39:11 -0700
From: Yury Norov <yury.norov@...il.com>
To: linux-kernel@...r.kernel.org
Cc: Yury Norov <yury.norov@...il.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: [PATCH v4 8/8] bitmap: move bitmap_*_region() functions to bitmap.h
Now that bitmap_*_region() functions are implemented as thin wrappers
around others, it's worth to move them to the header, as it opens room
for compile-time optimizations.
CC: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC: Rasmus Villemoes <linux@...musvillemoes.dk>
Signed-off-by: Yury Norov <yury.norov@...il.com>
---
include/linux/bitmap.h | 63 ++++++++++++++++++++++++++++++++++++++++--
lib/bitmap.c | 63 ------------------------------------------
2 files changed, 60 insertions(+), 66 deletions(-)
diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index 1516ff979315..973ae5b11c70 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -216,9 +216,6 @@ void bitmap_onto(unsigned long *dst, const unsigned long *orig,
const unsigned long *relmap, unsigned int bits);
void bitmap_fold(unsigned long *dst, const unsigned long *orig,
unsigned int sz, unsigned int nbits);
-int bitmap_find_free_region(unsigned long *bitmap, unsigned int bits, int order);
-void bitmap_release_region(unsigned long *bitmap, unsigned int pos, int order);
-int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order);
int bitmap_print_to_pagebuf(bool list, char *buf,
const unsigned long *maskp, int nmaskbits);
@@ -594,6 +591,66 @@ static inline void bitmap_set_value8(unsigned long *map, unsigned long value,
map[index] |= value << offset;
}
+/**
+ * bitmap_release_region - release allocated bitmap region
+ * @bitmap: array of unsigned longs corresponding to the bitmap
+ * @pos: beginning of bit region to release
+ * @order: region size (log base 2 of number of bits) to release
+ *
+ * This is the complement to __bitmap_find_free_region() and releases
+ * the found region (by clearing it in the bitmap).
+ */
+static inline void bitmap_release_region(unsigned long *bitmap, unsigned int pos, int order)
+{
+ bitmap_clear(bitmap, pos, pos + BIT(order));
+}
+
+/**
+ * bitmap_allocate_region - allocate bitmap region
+ * @bitmap: array of unsigned longs corresponding to the bitmap
+ * @pos: beginning of bit region to allocate
+ * @order: region size (log base 2 of number of bits) to allocate
+ *
+ * Allocate (set bits in) a specified region of a bitmap.
+ *
+ * Return: 0 on success, or %-EBUSY if specified region wasn't
+ * free (not all bits were zero).
+ */
+static inline int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order)
+{
+ unsigned int len = BIT(order);
+
+ if (find_next_bit(bitmap, pos + len, pos) < pos + len)
+ return -EBUSY;
+ bitmap_set(bitmap, pos, len);
+ return 0;
+}
+
+/*
+ * bitmap_find_free_region - find a contiguous aligned mem region
+ * @bitmap: array of unsigned longs corresponding to the bitmap
+ * @bits: number of bits in the bitmap
+ * @order: region size (log base 2 of number of bits) to find
+ *
+ * Find a region of free (zero) bits in a @bitmap of @bits bits and
+ * allocate them (set them to one). Only consider regions of length
+ * a power (@order) of two, aligned to that power of two, which
+ * makes the search algorithm much faster.
+ *
+ * Return: the bit offset in bitmap of the allocated region,
+ * or -errno on failure.
+ */
+static inline int bitmap_find_free_region(unsigned long *bitmap, unsigned int bits, int order)
+{
+ unsigned int pos, end; /* scans bitmap by regions of size order */
+
+ for (pos = 0; (end = pos + BIT(order)) <= bits; pos = end) {
+ if (!bitmap_allocate_region(bitmap, pos, order))
+ return pos;
+ }
+ return -ENOMEM;
+}
+
#endif /* __ASSEMBLY__ */
#endif /* __LINUX_BITMAP_H */
diff --git a/lib/bitmap.c b/lib/bitmap.c
index ab730ce52d21..65a6d5d47d81 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -1220,69 +1220,6 @@ void bitmap_fold(unsigned long *dst, const unsigned long *orig,
}
#endif /* CONFIG_NUMA */
-/**
- * bitmap_find_free_region - find a contiguous aligned mem region
- * @bitmap: array of unsigned longs corresponding to the bitmap
- * @bits: number of bits in the bitmap
- * @order: region size (log base 2 of number of bits) to find
- *
- * Find a region of free (zero) bits in a @bitmap of @bits bits and
- * allocate them (set them to one). Only consider regions of length
- * a power (@order) of two, aligned to that power of two, which
- * makes the search algorithm much faster.
- *
- * Return: the bit offset in bitmap of the allocated region,
- * or -errno on failure.
- */
-int bitmap_find_free_region(unsigned long *bitmap, unsigned int bits, int order)
-{
- unsigned int pos, end; /* scans bitmap by regions of size order */
-
- for (pos = 0; (end = pos + BIT(order)) <= bits; pos = end) {
- if (!bitmap_allocate_region(bitmap, pos, order))
- return pos;
- }
- return -ENOMEM;
-}
-EXPORT_SYMBOL(bitmap_find_free_region);
-
-/**
- * bitmap_release_region - release allocated bitmap region
- * @bitmap: array of unsigned longs corresponding to the bitmap
- * @pos: beginning of bit region to release
- * @order: region size (log base 2 of number of bits) to release
- *
- * This is the complement to __bitmap_find_free_region() and releases
- * the found region (by clearing it in the bitmap).
- */
-void bitmap_release_region(unsigned long *bitmap, unsigned int pos, int order)
-{
- bitmap_clear(bitmap, pos, pos + BIT(order));
-}
-EXPORT_SYMBOL(bitmap_release_region);
-
-/**
- * bitmap_allocate_region - allocate bitmap region
- * @bitmap: array of unsigned longs corresponding to the bitmap
- * @pos: beginning of bit region to allocate
- * @order: region size (log base 2 of number of bits) to allocate
- *
- * Allocate (set bits in) a specified region of a bitmap.
- *
- * Return: 0 on success, or %-EBUSY if specified region wasn't
- * free (not all bits were zero).
- */
-int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order)
-{
- unsigned int len = BIT(order);
-
- if (find_next_bit(bitmap, pos + len, pos) < pos + len)
- return -EBUSY;
- bitmap_set(bitmap, pos, len);
- return 0;
-}
-EXPORT_SYMBOL(bitmap_allocate_region);
-
unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags)
{
return kmalloc_array(BITS_TO_LONGS(nbits), sizeof(unsigned long),
--
2.39.2
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