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authorYury Norov <ynorov@caviumnetworks.com>2018-02-06 15:38:06 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-06 18:32:44 -0800
commit3aa56885e51683a19c8aa71739fd279b3f501cd7 (patch)
treee93c59c6988e8b35299381ef1ee47a584478058a /lib
parentc724f193619c896621bf5818d71ce77437f49a06 (diff)
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bitmap: replace bitmap_{from,to}_u32array
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>
Diffstat (limited to 'lib')
-rw-r--r--lib/bitmap.c87
-rw-r--r--lib/test_bitmap.c206
2 files changed, 31 insertions, 262 deletions
diff --git a/lib/bitmap.c b/lib/bitmap.c
index 47fe6441562c..9e498c77ed0e 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -1106,93 +1106,6 @@ 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
* @src: bitmap to copy
diff --git a/lib/test_bitmap.c b/lib/test_bitmap.c
index aa1f2669bdd5..de7ef2996a07 100644
--- a/lib/test_bitmap.c
+++ b/lib/test_bitmap.c
@@ -23,7 +23,7 @@ __check_eq_uint(const char *srcfile, unsigned int line,
const unsigned int exp_uint, unsigned int x)
{
if (exp_uint != x) {
- pr_warn("[%s:%u] expected %u, got %u\n",
+ pr_err("[%s:%u] expected %u, got %u\n",
srcfile, line, exp_uint, x);
return false;
}
@@ -33,19 +33,13 @@ __check_eq_uint(const char *srcfile, unsigned int line,
static bool __init
__check_eq_bitmap(const char *srcfile, unsigned int line,
- const unsigned long *exp_bmap, unsigned int exp_nbits,
- const unsigned long *bmap, unsigned int nbits)
+ const unsigned long *exp_bmap, const unsigned long *bmap,
+ unsigned int nbits)
{
- if (exp_nbits != nbits) {
- pr_warn("[%s:%u] bitmap length mismatch: expected %u, got %u\n",
- srcfile, line, exp_nbits, nbits);
- return false;
- }
-
if (!bitmap_equal(exp_bmap, bmap, nbits)) {
pr_warn("[%s:%u] bitmaps contents differ: expected \"%*pbl\", got \"%*pbl\"\n",
srcfile, line,
- exp_nbits, exp_bmap, nbits, bmap);
+ nbits, exp_bmap, nbits, bmap);
return false;
}
return true;
@@ -69,6 +63,10 @@ __check_eq_pbl(const char *srcfile, unsigned int line,
static bool __init
__check_eq_u32_array(const char *srcfile, unsigned int line,
const u32 *exp_arr, unsigned int exp_len,
+ const u32 *arr, unsigned int len) __used;
+static bool __init
+__check_eq_u32_array(const char *srcfile, unsigned int line,
+ const u32 *exp_arr, unsigned int exp_len,
const u32 *arr, unsigned int len)
{
if (exp_len != len) {
@@ -255,171 +253,29 @@ static void __init test_bitmap_parselist(void)
}
}
-static void __init test_bitmap_u32_array_conversions(void)
+static void __init test_bitmap_arr32(void)
{
- DECLARE_BITMAP(bmap1, 1024);
- DECLARE_BITMAP(bmap2, 1024);
- u32 exp_arr[32], arr[32];
- unsigned nbits;
-
- for (nbits = 0 ; nbits < 257 ; ++nbits) {
- const unsigned int used_u32s = DIV_ROUND_UP(nbits, 32);
- unsigned int i, rv;
-
- bitmap_zero(bmap1, nbits);
- bitmap_set(bmap1, nbits, 1024 - nbits); /* garbage */
-
- memset(arr, 0xff, sizeof(arr));
- rv = bitmap_to_u32array(arr, used_u32s, bmap1, nbits);
- expect_eq_uint(nbits, rv);
-
- memset(exp_arr, 0xff, sizeof(exp_arr));
- memset(exp_arr, 0, used_u32s*sizeof(*exp_arr));
- expect_eq_u32_array(exp_arr, 32, arr, 32);
-
- bitmap_fill(bmap2, 1024);
- rv = bitmap_from_u32array(bmap2, nbits, arr, used_u32s);
- expect_eq_uint(nbits, rv);
- expect_eq_bitmap(bmap1, 1024, bmap2, 1024);
-
- for (i = 0 ; i < nbits ; ++i) {
- /*
- * test conversion bitmap -> u32[]
- */
-
- bitmap_zero(bmap1, 1024);
- __set_bit(i, bmap1);
- bitmap_set(bmap1, nbits, 1024 - nbits); /* garbage */
-
- memset(arr, 0xff, sizeof(arr));
- rv = bitmap_to_u32array(arr, used_u32s, bmap1, nbits);
- expect_eq_uint(nbits, rv);
-
- /* 1st used u32 words contain expected bit set, the
- * remaining words are left unchanged (0xff)
- */
- memset(exp_arr, 0xff, sizeof(exp_arr));
- memset(exp_arr, 0, used_u32s*sizeof(*exp_arr));
- exp_arr[i/32] = (1U<<(i%32));
- expect_eq_u32_array(exp_arr, 32, arr, 32);
-
-
- /* same, with longer array to fill
- */
- memset(arr, 0xff, sizeof(arr));
- rv = bitmap_to_u32array(arr, 32, bmap1, nbits);
- expect_eq_uint(nbits, rv);
-
- /* 1st used u32 words contain expected bit set, the
- * remaining words are all 0s
- */
- memset(exp_arr, 0, sizeof(exp_arr));
- exp_arr[i/32] = (1U<<(i%32));
- expect_eq_u32_array(exp_arr, 32, arr, 32);
-
- /*
- * test conversion u32[] -> bitmap
- */
-
- /* the 1st nbits of bmap2 are identical to
- * bmap1, the remaining bits of bmap2 are left
- * unchanged (all 1s)
- */
- bitmap_fill(bmap2, 1024);
- rv = bitmap_from_u32array(bmap2, nbits,
- exp_arr, used_u32s);
- expect_eq_uint(nbits, rv);
-
- expect_eq_bitmap(bmap1, 1024, bmap2, 1024);
-
- /* same, with more bits to fill
- */
- memset(arr, 0xff, sizeof(arr)); /* garbage */
- memset(arr, 0, used_u32s*sizeof(u32));
- arr[i/32] = (1U<<(i%32));
-
- bitmap_fill(bmap2, 1024);
- rv = bitmap_from_u32array(bmap2, 1024, arr, used_u32s);
- expect_eq_uint(used_u32s*32, rv);
-
- /* the 1st nbits of bmap2 are identical to
- * bmap1, the remaining bits of bmap2 are cleared
- */
- bitmap_zero(bmap1, 1024);
- __set_bit(i, bmap1);
- expect_eq_bitmap(bmap1, 1024, bmap2, 1024);
-
-
- /*
- * test short conversion bitmap -> u32[] (1
- * word too short)
- */
- if (used_u32s > 1) {
- bitmap_zero(bmap1, 1024);
- __set_bit(i, bmap1);
- bitmap_set(bmap1, nbits,
- 1024 - nbits); /* garbage */
- memset(arr, 0xff, sizeof(arr));
-
- rv = bitmap_to_u32array(arr, used_u32s - 1,
- bmap1, nbits);
- expect_eq_uint((used_u32s - 1)*32, rv);
-
- /* 1st used u32 words contain expected
- * bit set, the remaining words are
- * left unchanged (0xff)
- */
- memset(exp_arr, 0xff, sizeof(exp_arr));
- memset(exp_arr, 0,
- (used_u32s-1)*sizeof(*exp_arr));
- if ((i/32) < (used_u32s - 1))
- exp_arr[i/32] = (1U<<(i%32));
- expect_eq_u32_array(exp_arr, 32, arr, 32);
- }
-
- /*
- * test short conversion u32[] -> bitmap (3
- * bits too short)
- */
- if (nbits > 3) {
- memset(arr, 0xff, sizeof(arr)); /* garbage */
- memset(arr, 0, used_u32s*sizeof(*arr));
- arr[i/32] = (1U<<(i%32));
-
- bitmap_zero(bmap1, 1024);
- rv = bitmap_from_u32array(bmap1, nbits - 3,
- arr, used_u32s);
- expect_eq_uint(nbits - 3, rv);
-
- /* we are expecting the bit < nbits -
- * 3 (none otherwise), and the rest of
- * bmap1 unchanged (0-filled)
- */
- bitmap_zero(bmap2, 1024);
- if (i < nbits - 3)
- __set_bit(i, bmap2);
- expect_eq_bitmap(bmap2, 1024, bmap1, 1024);
-
- /* do the same with bmap1 initially
- * 1-filled
- */
-
- bitmap_fill(bmap1, 1024);
- rv = bitmap_from_u32array(bmap1, nbits - 3,
- arr, used_u32s);
- expect_eq_uint(nbits - 3, rv);
-
- /* we are expecting the bit < nbits -
- * 3 (none otherwise), and the rest of
- * bmap1 unchanged (1-filled)
- */
- bitmap_zero(bmap2, 1024);
- if (i < nbits - 3)
- __set_bit(i, bmap2);
- bitmap_set(bmap2, nbits-3, 1024 - nbits + 3);
- expect_eq_bitmap(bmap2, 1024, bmap1, 1024);
- }
- }
+ unsigned int nbits, next_bit, len = sizeof(exp) * 8;
+ u32 arr[sizeof(exp) / 4];
+ DECLARE_BITMAP(bmap2, len);
+
+ memset(arr, 0xa5, sizeof(arr));
+
+ for (nbits = 0; nbits < len; ++nbits) {
+ bitmap_to_arr32(arr, exp, nbits);
+ bitmap_from_arr32(bmap2, arr, nbits);
+ expect_eq_bitmap(bmap2, exp, nbits);
+
+ next_bit = find_next_bit(bmap2,
+ round_up(nbits, BITS_PER_LONG), nbits);
+ if (next_bit < round_up(nbits, BITS_PER_LONG))
+ pr_err("bitmap_copy_arr32(nbits == %d:"
+ " tail is not safely cleared: %d\n",
+ nbits, next_bit);
+
+ if (nbits < len - 32)
+ expect_eq_uint(arr[DIV_ROUND_UP(nbits, 32)],
+ 0xa5a5a5a5);
}
}
@@ -454,7 +310,7 @@ static void noinline __init test_mem_optimisations(void)
static int __init test_bitmap_init(void)
{
test_zero_fill_copy();
- test_bitmap_u32_array_conversions();
+ test_bitmap_arr32();
test_bitmap_parselist();
test_mem_optimisations();