Hello,
the attached patch fixes the following compilation error with Xenomai's
head of trunk under Linux 2.4:
kernel/kernel.o(.text+0x135a4): In function `__rthal_generic_full_divmod64':
/temp/rtcan/devel/linuxppc_2_4_devel-xenomai/kernel/xenomai/arch/generic/hal.c:918:
undefined reference to `fls'
kernel/kernel.o(.text+0x135b4):/temp/rtcan/devel/linuxppc_2_4_devel-xenomai/kernel/xenomai/arch/generic/hal.c:918:
undefined reference to `fls'
Wolfgang.
Index: include/asm-generic/wrappers.h
===================================================================
--- include/asm-generic/wrappers.h (revision 2922)
+++ include/asm-generic/wrappers.h (working copy)
@@ -183,6 +183,18 @@ void show_stack(struct task_struct *task
#define __deprecated __attribute__((deprecated))
#endif
+/*
+ * fls: find last (most-significant) bit set.
+ * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
+ */
+static __inline__ int fls(unsigned int x)
+{
+ int lz;
+
+ asm ("cntlzw %0,%1" : "=r" (lz) : "r" (x));
+ return 32 - lz;
+}
+
#else /* LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) */
#define compat_module_param_array(name, type, count, perm) \
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