https://github.com/torvalds/linux
Pull ftrace fix from Steven Rostedt: "PeiyangX Qiu reported that if a module fails to load between calling ftrace_module_init() and do_init_module() that the allocations made in ftrace_module_init() will not be freed, resulting in a memory leak. The solution is to call ftrace_release_mod() on the failing module in the fail path befor do_init_module() is called. This will remove any allocations made for that module, and nothing if ftrace_module_init() wasn't called yet for that module. Note, once do_init_module() is called, the MODULE_GOING notifiers are called for the failed module, which calls into the ftrace code to do the proper clean up (basically calling ftrace_release_mod())" * tag 'trace-v4.4-rc4-4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: ftrace/module: Call clean up function when module init fails early
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Merge tag 'trace-v4.4-rc4-4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
#include <linux/kernel.h>
#include <asm/div64.h>
#include <linux/reciprocal_div.h>
#include <linux/export.h>
/*
* For a description of the algorithm please have a look at
* include/linux/reciprocal_div.h
*/
struct reciprocal_value reciprocal_value(u32 d)
{
struct reciprocal_value R;
u64 m;
int l;
l = fls(d - 1);
m = ((1ULL << 32) * ((1ULL << l) - d));
do_div(m, d);
++m;
R.m = (u32)m;
R.sh1 = min(l, 1);
R.sh2 = max(l - 1, 0);
return R;
}
EXPORT_SYMBOL(reciprocal_value);
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