> From: Johannes Berg
> Sent: 08 February 2017 12:24
...
> Btw, what's causing this to start with? Can't the compiler reuse the
> stack places?
Only if it realises they've gone out of scope - which probably
doesn't happen when the functions are inlined.
The address of the parameter can be saved by the calling function
and used in a later call.
Something like this is valid:
int foo(int *p, int v)
{
static int *sv;
int old = -1;
if (sv) {old = *sv; *sv = v;}
sv = v;
return old;
}
void bar(...) {
int a, b;
...
foo(&a, 0);
...
foo(&b, 1);
...
foo(NULL, 2);
...
If the compiler starts sharing stack it all goes wrong.
David
