treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / lib / clz_ctz.c
blob0d3a686b5ba29a91332a1bff14b4a2f70c0742e4
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * lib/clz_ctz.c
5 * Copyright (C) 2013 Chanho Min <chanho.min@lge.com>
7 * The functions in this file aren't called directly, but are required by
8 * GCC builtins such as __builtin_ctz, and therefore they can't be removed
9 * despite appearing unreferenced in kernel source.
11 * __c[lt]z[sd]i2 can be overridden by linking arch-specific versions.
14 #include <linux/export.h>
15 #include <linux/kernel.h>
17 int __weak __ctzsi2(int val);
18 int __weak __ctzsi2(int val)
20 return __ffs(val);
22 EXPORT_SYMBOL(__ctzsi2);
24 int __weak __clzsi2(int val);
25 int __weak __clzsi2(int val)
27 return 32 - fls(val);
29 EXPORT_SYMBOL(__clzsi2);
31 int __weak __clzdi2(long val);
32 int __weak __ctzdi2(long val);
33 #if BITS_PER_LONG == 32
35 int __weak __clzdi2(long val)
37 return 32 - fls((int)val);
39 EXPORT_SYMBOL(__clzdi2);
41 int __weak __ctzdi2(long val)
43 return __ffs((u32)val);
45 EXPORT_SYMBOL(__ctzdi2);
47 #elif BITS_PER_LONG == 64
49 int __weak __clzdi2(long val)
51 return 64 - fls64((u64)val);
53 EXPORT_SYMBOL(__clzdi2);
55 int __weak __ctzdi2(long val)
57 return __ffs64((u64)val);
59 EXPORT_SYMBOL(__ctzdi2);
61 #else
62 #error BITS_PER_LONG not 32 or 64
63 #endif