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new helper: sigsp()

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Normal logics for altstack handling in sigframe allocation

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-11-06 13:28:21 -05:00
parent 2ce5da1757
commit 5a1b98d309
1 changed files with 11 additions and 0 deletions
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11
include/linux/sched.h
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@ -2305,6 +2305,17 @@ static inline int sas_ss_flags(unsigned long sp)
: on_sig_stack(sp) ? SS_ONSTACK : 0);
}
static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)
{
if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))
#ifdef CONFIG_STACK_GROWSUP
return current->sas_ss_sp;
#else
return current->sas_ss_sp + current->sas_ss_size;
#endif
return sp;
}
/*
* Routines for handling mm_structs
*/