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ftrace: Remove redundant swap function 

To cover the common case of sorting an array of pointers, Daniel
Wagner recently modified the library sort() to use a specific swap
function for size==8, in addition to the size==4 case which was
already handled. Since sizeof(long) is either 4 or 8,
ftrace_swap_ips() is redundant and we can just let sort() pick an
appropriate and fast swap callback.

Link: http://lkml.kernel.org/r/1441834023-13130-1-git-send-email-linux@rasmusvillemoes.dk

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Rasmus Villemoes 2015-09-09 23:27:02 +02:00 committed by Steven Rostedt
parent 79ac6ef521
commit 6db0290322
1 changed files with 1 additions and 12 deletions
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13
kernel/trace/ftrace.c
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@ -4788,17 +4788,6 @@ static int ftrace_cmp_ips(const void *a, const void *b)
return 0;
}
static void ftrace_swap_ips(void *a, void *b, int size)
{
unsigned long *ipa = a;
unsigned long *ipb = b;
unsigned long t;
t = *ipa;
*ipa = *ipb;
*ipb = t;
}
static int ftrace_process_locs(struct module *mod,
unsigned long *start,
unsigned long *end)
@ -4818,7 +4807,7 @@ static int ftrace_process_locs(struct module *mod,
return 0;
sort(start, count, sizeof(*start),
ftrace_cmp_ips, ftrace_swap_ips);
ftrace_cmp_ips, NULL);
start_pg = ftrace_allocate_pages(count);
if (!start_pg)