__div64_32(): make it overridable at compile time
Some architectures may want to override the default implementation at compile time to do things inline. For example, ARM uses a non-standard calling convention for better efficiency in this case. Signed-off-by: Nicolas Pitre <nico@linaro.org>
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@ -194,7 +194,9 @@ static inline uint64_t __arch_xprod_64(const uint64_t m, uint64_t n, bool bias)
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}
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#endif
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#ifndef __div64_32
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extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor);
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#endif
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/* The unnecessary pointer compare is there
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* to check for type safety (n must be 64bit)
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@ -13,7 +13,8 @@
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*
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* Code generated for this function might be very inefficient
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* for some CPUs. __div64_32() can be overridden by linking arch-specific
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* assembly versions such as arch/ppc/lib/div64.S and arch/sh/lib/div64.S.
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* assembly versions such as arch/ppc/lib/div64.S and arch/sh/lib/div64.S
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* or by defining a preprocessor macro in arch/include/asm/div64.h.
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*/
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#include <linux/export.h>
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@ -23,6 +24,7 @@
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/* Not needed on 64bit architectures */
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#if BITS_PER_LONG == 32
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#ifndef __div64_32
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uint32_t __attribute__((weak)) __div64_32(uint64_t *n, uint32_t base)
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{
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uint64_t rem = *n;
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@ -55,8 +57,8 @@ uint32_t __attribute__((weak)) __div64_32(uint64_t *n, uint32_t base)
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*n = res;
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return rem;
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}
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EXPORT_SYMBOL(__div64_32);
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#endif
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#ifndef div_s64_rem
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s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder)
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