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bitmap: replace bitmap_{from,to}_u32array

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with bitmap_{from,to}_arr32 over the kernel. Additionally to it:
* __check_eq_bitmap() now takes single nbits argument.
* __check_eq_u32_array is not used in new test but may be used in
  future. So I don't remove it here, but annotate as __used.

Tested on arm64 and 32-bit BE mips.

[arnd@arndb.de: perf: arm_dsu_pmu: convert to bitmap_from_arr32]
  Link: http://lkml.kernel.org/r/20180201172508.5739-2-ynorov@caviumnetworks.com
[ynorov@caviumnetworks.com: fix net/core/ethtool.c]
  Link: http://lkml.kernel.org/r/20180205071747.4ekxtsbgxkj5b2fz@yury-thinkpad
Link: http://lkml.kernel.org/r/20171228150019.27953-2-ynorov@caviumnetworks.com
Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: David Decotigny <decot@googlers.com>,
Cc: David S. Miller <davem@davemloft.net>,
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Yury Norov
2018-02-06 15:38:06 -08:00
committed by Linus Torvalds
parent c724f19361
commit 3aa56885e5
6 changed files with 53 additions and 307 deletions
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87
lib/bitmap.c
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@@ -1105,93 +1105,6 @@ int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order)
}
EXPORT_SYMBOL(bitmap_allocate_region);
/**
* bitmap_from_u32array - copy the contents of a u32 array of bits to bitmap
* @bitmap: array of unsigned longs, the destination bitmap, non NULL
* @nbits: number of bits in @bitmap
* @buf: array of u32 (in host byte order), the source bitmap, non NULL
* @nwords: number of u32 words in @buf
*
* copy min(nbits, 32*nwords) bits from @buf to @bitmap, remaining
* bits between nword and nbits in @bitmap (if any) are cleared. In
* last word of @bitmap, the bits beyond nbits (if any) are kept
* unchanged.
*
* Return the number of bits effectively copied.
*/
unsigned int
bitmap_from_u32array(unsigned long *bitmap, unsigned int nbits,
const u32 *buf, unsigned int nwords)
{
unsigned int dst_idx, src_idx;
for (src_idx = dst_idx = 0; dst_idx < BITS_TO_LONGS(nbits); ++dst_idx) {
unsigned long part = 0;
if (src_idx < nwords)
part = buf[src_idx++];
#if BITS_PER_LONG == 64
if (src_idx < nwords)
part |= ((unsigned long) buf[src_idx++]) << 32;
#endif
if (dst_idx < nbits/BITS_PER_LONG)
bitmap[dst_idx] = part;
else {
unsigned long mask = BITMAP_LAST_WORD_MASK(nbits);
bitmap[dst_idx] = (bitmap[dst_idx] & ~mask)
| (part & mask);
}
}
return min_t(unsigned int, nbits, 32*nwords);
}
EXPORT_SYMBOL(bitmap_from_u32array);
/**
* bitmap_to_u32array - copy the contents of bitmap to a u32 array of bits
* @buf: array of u32 (in host byte order), the dest bitmap, non NULL
* @nwords: number of u32 words in @buf
* @bitmap: array of unsigned longs, the source bitmap, non NULL
* @nbits: number of bits in @bitmap
*
* copy min(nbits, 32*nwords) bits from @bitmap to @buf. Remaining
* bits after nbits in @buf (if any) are cleared.
*
* Return the number of bits effectively copied.
*/
unsigned int
bitmap_to_u32array(u32 *buf, unsigned int nwords,
const unsigned long *bitmap, unsigned int nbits)
{
unsigned int dst_idx = 0, src_idx = 0;
while (dst_idx < nwords) {
unsigned long part = 0;
if (src_idx < BITS_TO_LONGS(nbits)) {
part = bitmap[src_idx];
if (src_idx >= nbits/BITS_PER_LONG)
part &= BITMAP_LAST_WORD_MASK(nbits);
src_idx++;
}
buf[dst_idx++] = part & 0xffffffffUL;
#if BITS_PER_LONG == 64
if (dst_idx < nwords) {
part >>= 32;
buf[dst_idx++] = part & 0xffffffffUL;
}
#endif
}
return min_t(unsigned int, nbits, 32*nwords);
}
EXPORT_SYMBOL(bitmap_to_u32array);
/**
* bitmap_copy_le - copy a bitmap, putting the bits into little-endian order.
* @dst: destination buffer