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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /lib/test_bitops.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/test_bitops.c')
-rw-r--r-- | lib/test_bitops.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/lib/test_bitops.c b/lib/test_bitops.c new file mode 100644 index 0000000000..3b7bcbee84 --- /dev/null +++ b/lib/test_bitops.c @@ -0,0 +1,111 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2020 Intel Corporation + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/printk.h> + +/* a tiny module only meant to test + * + * set/clear_bit + * get_count_order/long + */ + +/* use an enum because that's the most common BITMAP usage */ +enum bitops_fun { + BITOPS_4 = 4, + BITOPS_7 = 7, + BITOPS_11 = 11, + BITOPS_31 = 31, + BITOPS_88 = 88, + BITOPS_LAST = 255, + BITOPS_LENGTH = 256 +}; + +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, bit_set; + + pr_info("Starting bitops test\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 + + barrier(); + + clear_bit(BITOPS_4, g_bitmap); + clear_bit(BITOPS_7, g_bitmap); + clear_bit(BITOPS_11, g_bitmap); + clear_bit(BITOPS_31, g_bitmap); + clear_bit(BITOPS_88, g_bitmap); + + bit_set = find_first_bit(g_bitmap, BITOPS_LAST); + if (bit_set != BITOPS_LAST) + pr_err("ERROR: FOUND SET BIT %d\n", bit_set); + + pr_info("Completed bitops test\n"); + + return 0; +} + +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>, Wei Yang <richard.weiyang@gmail.com>"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Bit testing module"); |