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Message-ID: <20240327152358.2368467-14-aleksander.lobakin@intel.com>
Date: Wed, 27 Mar 2024 16:23:50 +0100
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
Yury Norov <yury.norov@...il.com>,
Alexander Potapenko <glider@...gle.com>,
nex.sw.ncis.osdt.itp.upstreaming@...el.com,
intel-wired-lan@...ts.osuosl.org,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH net-next v6 13/21] bitmap: make bitmap_{get,set}_value8() use bitmap_{read,write}()
Now that we have generic bitmap_read() and bitmap_write(), which are
inline and try to take care of non-bound-crossing and aligned cases
to keep them optimized, collapse bitmap_{get,set}_value8() into
simple wrappers around the former ones.
bloat-o-meter shows no difference in vmlinux and -2 bytes for
gpio-pca953x.ko, which says the optimization didn't suffer due to
that change. The converted helpers have the value width embedded
and always compile-time constant and that helps a lot.
Suggested-by: Yury Norov <yury.norov@...il.com>
Signed-off-by: Yury Norov <yury.norov@...il.com>
Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>
---
include/linux/bitmap.h | 38 +++++---------------------------------
1 file changed, 5 insertions(+), 33 deletions(-)
diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index 363e0b184a45..8c4768c44a01 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -727,39 +727,6 @@ static inline void bitmap_from_u64(unsigned long *dst, u64 mask)
bitmap_from_arr64(dst, &mask, 64);
}
-/**
- * bitmap_get_value8 - get an 8-bit value within a memory region
- * @map: address to the bitmap memory region
- * @start: bit offset of the 8-bit value; must be a multiple of 8
- *
- * Returns the 8-bit value located at the @start bit offset within the @src
- * memory region.
- */
-static inline unsigned long bitmap_get_value8(const unsigned long *map,
- unsigned long start)
-{
- const size_t index = BIT_WORD(start);
- const unsigned long offset = start % BITS_PER_LONG;
-
- return (map[index] >> offset) & 0xFF;
-}
-
-/**
- * bitmap_set_value8 - set an 8-bit value within a memory region
- * @map: address to the bitmap memory region
- * @value: the 8-bit value; values wider than 8 bits may clobber bitmap
- * @start: bit offset of the 8-bit value; must be a multiple of 8
- */
-static inline void bitmap_set_value8(unsigned long *map, unsigned long value,
- unsigned long start)
-{
- const size_t index = BIT_WORD(start);
- const unsigned long offset = start % BITS_PER_LONG;
-
- map[index] &= ~(0xFFUL << offset);
- map[index] |= value << offset;
-}
-
/**
* bitmap_read - read a value of n-bits from the memory region
* @map: address to the bitmap memory region
@@ -833,6 +800,11 @@ static inline void bitmap_write(unsigned long *map, unsigned long value,
map[index + 1] |= (value >> space);
}
+#define bitmap_get_value8(map, start) \
+ bitmap_read(map, start, BITS_PER_BYTE)
+#define bitmap_set_value8(map, value, start) \
+ bitmap_write(map, value, start, BITS_PER_BYTE)
+
#endif /* __ASSEMBLY__ */
#endif /* __LINUX_BITMAP_H */
--
2.44.0
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