668a920208
The generic __div64_32() definition is built on all architectures that
don't provide this as a macro. m68k however neither defines nor
requires __div64_32, so it should define an empty one to avoid the
warning:
lib/math/div64.c:31:32: error: no previous prototype for '__div64_32' [-Werror=missing-prototypes]
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20230809211057.60514-1-arnd@kernel.org
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
39 lines
959 B
C
39 lines
959 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _M68K_DIV64_H
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#define _M68K_DIV64_H
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#ifdef CONFIG_CPU_HAS_NO_MULDIV64
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#include <asm-generic/div64.h>
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#else
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#include <linux/types.h>
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/* n = n / base; return rem; */
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#define do_div(n, base) ({ \
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union { \
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unsigned long n32[2]; \
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unsigned long long n64; \
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} __n; \
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unsigned long __rem, __upper; \
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unsigned long __base = (base); \
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\
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__n.n64 = (n); \
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if ((__upper = __n.n32[0])) { \
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asm ("divul.l %2,%1:%0" \
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: "=d" (__n.n32[0]), "=d" (__upper) \
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: "d" (__base), "0" (__n.n32[0])); \
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} \
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asm ("divu.l %2,%1:%0" \
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: "=d" (__n.n32[1]), "=d" (__rem) \
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: "d" (__base), "1" (__upper), "0" (__n.n32[1])); \
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(n) = __n.n64; \
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__rem; \
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})
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/* defining this stops the unused helper function from being built */
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#define __div64_32 __div64_32
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#endif /* CONFIG_CPU_HAS_NO_MULDIV64 */
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#endif /* _M68K_DIV64_H */
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