summaryrefslogtreecommitdiff
path: root/lib
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2020-06-11 13:25:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-11 13:25:53 -0700
commit623f6dc593eaf98b91916836785278eddddaacf8 (patch)
tree8a50c706ca3f8f1842b47b3091e7d38f5b9c0b21 /lib
parent5cd221e837d6fe2a4d284360581be3fdcbf79734 (diff)
parent37c54f9bd48663f7657a9178fe08c47e4f5b537b (diff)
Merge branch 'akpm' (patches from Andrew)
Merge some more updates from Andrew Morton: - various hotfixes and minor things - hch's use_mm/unuse_mm clearnups Subsystems affected by this patch series: mm/hugetlb, scripts, kcov, lib, nilfs, checkpatch, lib, mm/debug, ocfs2, lib, misc. * emailed patches from Andrew Morton <akpm@linux-foundation.org>: kernel: set USER_DS in kthread_use_mm kernel: better document the use_mm/unuse_mm API contract kernel: move use_mm/unuse_mm to kthread.c kernel: move use_mm/unuse_mm to kthread.c stacktrace: cleanup inconsistent variable type lib: test get_count_order/long in test_bitops.c mm: add comments on pglist_data zones ocfs2: fix spelling mistake and grammar mm/debug_vm_pgtable: fix kernel crash by checking for THP support lib: fix bitmap_parse() on 64-bit big endian archs checkpatch: correct check for kernel parameters doc nilfs2: fix null pointer dereference at nilfs_segctor_do_construct() lib/lz4/lz4_decompress.c: document deliberate use of `&' kcov: check kcov_softirq in kcov_remote_stop() scripts/spelling: add a few more typos khugepaged: selftests: fix timeout condition in wait_for_scan()
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug10
-rw-r--r--lib/bitmap.c9
-rw-r--r--lib/lz4/lz4_decompress.c3
-rw-r--r--lib/test_bitops.c53
4 files changed, 66 insertions, 9 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index cb98741601bd..5beec9c833ce 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2052,15 +2052,15 @@ config TEST_LKM
If unsure, say N.
config TEST_BITOPS
- tristate "Test module for compilation of clear_bit/set_bit operations"
+ tristate "Test module for compilation of bitops operations"
depends on m
help
This builds the "test_bitops" module that is much like the
TEST_LKM module except that it does a basic exercise of the
- clear_bit and set_bit macros to make sure there are no compiler
- warnings from C=1 sparse checker or -Wextra compilations. It has
- no dependencies and doesn't run or load unless explicitly requested
- by name. for example: modprobe test_bitops.
+ set/clear_bit macros and get_count_order/long to make sure there are
+ no compiler warnings from C=1 sparse checker or -Wextra
+ compilations. It has no dependencies and doesn't run or load unless
+ explicitly requested by name. for example: modprobe test_bitops.
If unsure, say N.
diff --git a/lib/bitmap.c b/lib/bitmap.c
index 21a7640c5eed..0364452b1617 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -741,8 +741,9 @@ int bitmap_parse(const char *start, unsigned int buflen,
int chunks = BITS_TO_U32(nmaskbits);
u32 *bitmap = (u32 *)maskp;
int unset_bit;
+ int chunk;
- while (1) {
+ for (chunk = 0; ; chunk++) {
end = bitmap_find_region_reverse(start, end);
if (start > end)
break;
@@ -750,7 +751,11 @@ int bitmap_parse(const char *start, unsigned int buflen,
if (!chunks--)
return -EOVERFLOW;
- end = bitmap_get_x32_reverse(start, end, bitmap++);
+#if defined(CONFIG_64BIT) && defined(__BIG_ENDIAN)
+ end = bitmap_get_x32_reverse(start, end, &bitmap[chunk ^ 1]);
+#else
+ end = bitmap_get_x32_reverse(start, end, &bitmap[chunk]);
+#endif
if (IS_ERR(end))
return PTR_ERR(end);
}
diff --git a/lib/lz4/lz4_decompress.c b/lib/lz4/lz4_decompress.c
index 0c9d3ad17e0f..5371dab6b481 100644
--- a/lib/lz4/lz4_decompress.c
+++ b/lib/lz4/lz4_decompress.c
@@ -141,6 +141,9 @@ static FORCE_INLINE int LZ4_decompress_generic(
* space in the output for those 18 bytes earlier, upon
* entering the shortcut (in other words, there is a
* combined check for both stages).
+ *
+ * The & in the likely() below is intentionally not && so that
+ * some compilers can produce better parallelized runtime code
*/
if ((endOnInput ? length != RUN_MASK : length <= 8)
/*
diff --git a/lib/test_bitops.c b/lib/test_bitops.c
index fd50b3ae4a14..ced25e3a779b 100644
--- a/lib/test_bitops.c
+++ b/lib/test_bitops.c
@@ -9,7 +9,11 @@
#include <linux/module.h>
#include <linux/printk.h>
-/* a tiny module only meant to test set/clear_bit */
+/* a tiny module only meant to test
+ *
+ * set/clear_bit
+ * get_count_order/long
+ */
/* use an enum because thats the most common BITMAP usage */
enum bitops_fun {
@@ -24,14 +28,59 @@ enum bitops_fun {
static DECLARE_BITMAP(g_bitmap, BITOPS_LENGTH);
+static unsigned int order_comb[][2] = {
+ {0x00000003, 2},
+ {0x00000004, 2},
+ {0x00001fff, 13},
+ {0x00002000, 13},
+ {0x50000000, 31},
+ {0x80000000, 31},
+ {0x80003000, 32},
+};
+
+#ifdef CONFIG_64BIT
+static unsigned long order_comb_long[][2] = {
+ {0x0000000300000000, 34},
+ {0x0000000400000000, 34},
+ {0x00001fff00000000, 45},
+ {0x0000200000000000, 45},
+ {0x5000000000000000, 63},
+ {0x8000000000000000, 63},
+ {0x8000300000000000, 64},
+};
+#endif
+
static int __init test_bitops_startup(void)
{
+ int i;
+
pr_warn("Loaded test module\n");
set_bit(BITOPS_4, g_bitmap);
set_bit(BITOPS_7, g_bitmap);
set_bit(BITOPS_11, g_bitmap);
set_bit(BITOPS_31, g_bitmap);
set_bit(BITOPS_88, g_bitmap);
+
+ for (i = 0; i < ARRAY_SIZE(order_comb); i++) {
+ if (order_comb[i][1] != get_count_order(order_comb[i][0]))
+ pr_warn("get_count_order wrong for %x\n",
+ order_comb[i][0]);
+ }
+
+ for (i = 0; i < ARRAY_SIZE(order_comb); i++) {
+ if (order_comb[i][1] != get_count_order_long(order_comb[i][0]))
+ pr_warn("get_count_order_long wrong for %x\n",
+ order_comb[i][0]);
+ }
+
+#ifdef CONFIG_64BIT
+ for (i = 0; i < ARRAY_SIZE(order_comb_long); i++) {
+ if (order_comb_long[i][1] !=
+ get_count_order_long(order_comb_long[i][0]))
+ pr_warn("get_count_order_long wrong for %lx\n",
+ order_comb_long[i][0]);
+ }
+#endif
return 0;
}
@@ -55,6 +104,6 @@ static void __exit test_bitops_unstartup(void)
module_init(test_bitops_startup);
module_exit(test_bitops_unstartup);
-MODULE_AUTHOR("Jesse Brandeburg <jesse.brandeburg@intel.com>");
+MODULE_AUTHOR("Jesse Brandeburg <jesse.brandeburg@intel.com>, Wei Yang <richard.weiyang@gmail.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Bit testing module");