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Subject[PATCH 3.16 115/202] ia64: Use get_signal() signal_setup_done()
3.16.66-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Weinberger <richard@nod.at>

commit 98c20309b97fc30001adf643cf876125f334fd8a upstream.

Use the more generic functions get_signal() signal_setup_done()
for signal delivery.
This inverts also the return codes of force_sigsegv_info()
and setup_frame() to follow the kernel convention.

Signed-off-by: Richard Weinberger <richard@nod.at>
[bwh: Backported to 3.16 as dependency of commit 35634ffa1751
"signal: Always notice exiting tasks"]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
arch/ia64/kernel/signal.c | 46 ++++++++++++++++++---------------------
1 file changed, 21 insertions(+), 25 deletions(-)

--- a/arch/ia64/kernel/signal.c
+++ b/arch/ia64/kernel/signal.c
@@ -309,12 +309,11 @@ force_sigsegv_info (int sig, void __user
si.si_uid = from_kuid_munged(current_user_ns(), current_uid());
si.si_addr = addr;
force_sig_info(SIGSEGV, &si, current);
- return 0;
+ return 1;
}

static long
-setup_frame (int sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *set,
- struct sigscratch *scr)
+setup_frame(struct ksignal *ksig, sigset_t *set, struct sigscratch *scr)
{
extern char __kernel_sigtramp[];
unsigned long tramp_addr, new_rbs = 0, new_sp;
@@ -323,7 +322,7 @@ setup_frame (int sig, struct k_sigaction

new_sp = scr->pt.r12;
tramp_addr = (unsigned long) __kernel_sigtramp;
- if (ka->sa.sa_flags & SA_ONSTACK) {
+ if (ksig->ka.sa.sa_flags & SA_ONSTACK) {
int onstack = sas_ss_flags(new_sp);

if (onstack == 0) {
@@ -347,29 +346,29 @@ setup_frame (int sig, struct k_sigaction
*/
check_sp = (new_sp - sizeof(*frame)) & -STACK_ALIGN;
if (!likely(on_sig_stack(check_sp)))
- return force_sigsegv_info(sig, (void __user *)
+ return force_sigsegv_info(ksig->sig, (void __user *)
check_sp);
}
}
frame = (void __user *) ((new_sp - sizeof(*frame)) & -STACK_ALIGN);

if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- return force_sigsegv_info(sig, frame);
+ return force_sigsegv_info(ksig->sig, frame);

- err = __put_user(sig, &frame->arg0);
+ err = __put_user(ksig->sig, &frame->arg0);
err |= __put_user(&frame->info, &frame->arg1);
err |= __put_user(&frame->sc, &frame->arg2);
err |= __put_user(new_rbs, &frame->sc.sc_rbs_base);
err |= __put_user(0, &frame->sc.sc_loadrs); /* initialize to zero */
- err |= __put_user(ka->sa.sa_handler, &frame->handler);
+ err |= __put_user(ksig->ka.sa.sa_handler, &frame->handler);

- err |= copy_siginfo_to_user(&frame->info, info);
+ err |= copy_siginfo_to_user(&frame->info, &ksig->info);

err |= __save_altstack(&frame->sc.sc_stack, scr->pt.r12);
err |= setup_sigcontext(&frame->sc, set, scr);

if (unlikely(err))
- return force_sigsegv_info(sig, frame);
+ return force_sigsegv_info(ksig->sig, frame);

scr->pt.r12 = (unsigned long) frame - 16; /* new stack pointer */
scr->pt.ar_fpsr = FPSR_DEFAULT; /* reset fpsr for signal handler */
@@ -394,22 +393,20 @@ setup_frame (int sig, struct k_sigaction

#if DEBUG_SIG
printk("SIG deliver (%s:%d): sig=%d sp=%lx ip=%lx handler=%p\n",
- current->comm, current->pid, sig, scr->pt.r12, frame->sc.sc_ip, frame->handler);
+ current->comm, current->pid, ksig->sig, scr->pt.r12, frame->sc.sc_ip, frame->handler);
#endif
- return 1;
+ return 0;
}

static long
-handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
- struct sigscratch *scr)
+handle_signal (struct ksignal *ksig, struct sigscratch *scr)
{
- if (!setup_frame(sig, ka, info, sigmask_to_save(), scr))
- return 0;
+ int ret = setup_frame(ksig, sigmask_to_save(), scr);

- signal_delivered(sig, info, ka, &scr->pt,
- test_thread_flag(TIF_SINGLESTEP));
+ if (!ret)
+ signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));

- return 1;
+ return ret;
}

/*
@@ -419,17 +416,16 @@ handle_signal (unsigned long sig, struct
void
ia64_do_signal (struct sigscratch *scr, long in_syscall)
{
- struct k_sigaction ka;
- siginfo_t info;
long restart = in_syscall;
long errno = scr->pt.r8;
+ struct ksignal ksig;

/*
* This only loops in the rare cases of handle_signal() failing, in which case we
* need to push through a forced SIGSEGV.
*/
while (1) {
- int signr = get_signal_to_deliver(&info, &ka, &scr->pt, NULL);
+ get_signal(&ksig);

/*
* get_signal_to_deliver() may have run a debugger (via notify_parent())
@@ -446,7 +442,7 @@ ia64_do_signal (struct sigscratch *scr,
*/
restart = 0;

- if (signr <= 0)
+ if (ksig.sig <= 0)
break;

if (unlikely(restart)) {
@@ -458,7 +454,7 @@ ia64_do_signal (struct sigscratch *scr,
break;

case ERESTARTSYS:
- if ((ka.sa.sa_flags & SA_RESTART) == 0) {
+ if ((ksig.ka.sa.sa_flags & SA_RESTART) == 0) {
scr->pt.r8 = EINTR;
/* note: scr->pt.r10 is already -1 */
break;
@@ -473,7 +469,7 @@ ia64_do_signal (struct sigscratch *scr,
* Whee! Actually deliver the signal. If the delivery failed, we need to
* continue to iterate in this loop so we can deliver the SIGSEGV...
*/
- if (handle_signal(signr, &ka, &info, scr))
+ if (handle_signal(&ksig, scr))
return;
}

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