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introduce generic sys_sigaltstack(), switch x86 and um to it

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Conditional on CONFIG_GENERIC_SIGALTSTACK; architectures that do not
select it are completely unaffected

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2012-12-14 14:09:47 -05:00
commit 6bf9adfc90
14 changed files with 19 additions and 21 deletions
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6
kernel/signal.c
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@ -3102,6 +3102,12 @@ do_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, unsigned long s
out:
return error;
}
#ifdef CONFIG_GENERIC_SIGALTSTACK
SYSCALL_DEFINE2(sigaltstack,const stack_t __user *,uss, stack_t __user *,uoss)
{
return do_sigaltstack(uss, uoss, current_user_stack_pointer());
}
#endif
int restore_altstack(const stack_t __user *uss)
{