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nptl: fix set-but-unused warning w/_STACK_GROWS_UP

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On arches that set _STACK_GROWS_UP, the stacktop variable is declared
and set, but never actually used.  Refactor the code a bit so that the
variable is only declared/set under _STACK_GROWS_DOWN settings.
This commit is contained in:
Mike Frysinger
2015-07-29 22:53:28 -04:00
parent 1b15ff4810
commit 3fad53ec87
2 changed files with 16 additions and 7 deletions
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17
nptl/allocatestack.c
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@ -353,7 +353,6 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
struct pthread *pd;
size_t size;
size_t pagesize_m1 = __getpagesize () - 1;
void *stacktop;
assert (powerof2 (pagesize_m1 + 1));
assert (TCB_ALIGNMENT >= STACK_ALIGN);
@ -717,19 +716,23 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
/* We place the thread descriptor at the end of the stack. */
*pdp = pd;
#if TLS_TCB_AT_TP
#if _STACK_GROWS_DOWN
void *stacktop;
# if TLS_TCB_AT_TP
/* The stack begins before the TCB and the static TLS block. */
stacktop = ((char *) (pd + 1) - __static_tls_size);
#elif TLS_DTV_AT_TP
# elif TLS_DTV_AT_TP
stacktop = (char *) (pd - 1);
#endif
# endif
#ifdef NEED_SEPARATE_REGISTER_STACK
# ifdef NEED_SEPARATE_REGISTER_STACK
*stack = pd->stackblock;
*stacksize = stacktop - *stack;
#elif _STACK_GROWS_DOWN
# else
*stack = stacktop;
#elif _STACK_GROWS_UP
# endif
#else
*stack = pd->stackblock;
assert (*stack > 0);
#endif