### [POWERPC] Add "is_power_of_2" checking to log2.h.

```

Add the inline function "is_power_of_2()" to log2.h, where the value
zero is *not* considered to be a power of two.
Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>```
parent 7df2457d
 ... ... @@ -294,11 +294,8 @@ void __init mapin_ram(void) } } /* is x a power of 2? */ #define is_power_of_2(x) ((x) != 0 && (((x) & ((x) - 1)) == 0)) /* is x a power of 4? */ #define is_power_of_4(x) ((x) != 0 && (((x) & (x-1)) == 0) && (ffs(x) & 1)) #define is_power_of_4(x) is_power_of_2(x) && (ffs(x) & 1)) /* * Set up a mapping for a block of I/O. ... ...
 ... ... @@ -313,11 +313,8 @@ void __init mapin_ram(void) } } /* is x a power of 2? */ #define is_power_of_2(x) ((x) != 0 && (((x) & ((x) - 1)) == 0)) /* is x a power of 4? */ #define is_power_of_4(x) ((x) != 0 && (((x) & (x-1)) == 0) && (ffs(x) & 1)) #define is_power_of_4(x) is_power_of_2(x) && (ffs(x) & 1)) /* * Set up a mapping for a block of I/O. ... ...
 ... ... @@ -59,8 +59,6 @@ #define DBELL_TID(x) (*(u8 *)(x + DOORBELL_TID_OFFSET)) #define DBELL_INF(x) (*(u16 *)(x + DOORBELL_INFO_OFFSET)) #define is_power_of_2(x) (((x) & ((x) - 1)) == 0) struct rio_atmu_regs { u32 rowtar; u32 pad1; ... ...
 ... ... @@ -42,8 +42,6 @@ #include "gianfar.h" #define is_power_of_2(x) ((x) != 0 && (((x) & ((x) - 1)) == 0)) extern void gfar_start(struct net_device *dev); extern int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit); ... ...
 ... ... @@ -43,6 +43,17 @@ int __ilog2_u64(u64 n) } #endif /* * Determine whether some value is a power of two, where zero is * *not* considered a power of two. */ static inline __attribute__((const)) bool is_power_of_2(unsigned long n) { return (n != 0 && ((n & (n - 1)) == 0)); } /* * round up to nearest power of two */ ... ...
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