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Commit c15787a7c3f702c4240708fb8e63abce1bfe1136

Authored by Martin Schwidefsky
1 parent a686425b31
Exists in smarc-l5.0.0_1.0.0-ga and in 5 other branches imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga

s390: remove dead code from signal handler 

The code in entry[64].S calls do_signal only on return to user space.
user_mode(regs) is true for every calls to do_signal, it is unnecessary
to recheck user_mode at the start of do_signal and the legacy signal
stack switching path in get_sigframe is never reached.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

Showing 2 changed files with 0 additions and 23 deletions Side-by-side Diff

arch/s390/kernel/compat_signal.c
Diff comments   View file @ c15787a
... ... @@ -437,13 +437,6 @@
437 437 sp = current->sas_ss_sp + current->sas_ss_size;
438 438 }
439 439  
440   - /* This is the legacy signal stack switching. */
441   - else if (!user_mode(regs) &&
442   - !(ka->sa.sa_flags & SA_RESTORER) &&
443   - ka->sa.sa_restorer) {
444   - sp = (unsigned long) ka->sa.sa_restorer;
445   - }
446   -
447 440 return (void __user *)((sp - frame_size) & -8ul);
448 441 }
449 442  
arch/s390/kernel/signal.c
Diff comments   View file @ c15787a
... ... @@ -235,13 +235,6 @@
235 235 sp = current->sas_ss_sp + current->sas_ss_size;
236 236 }
237 237  
238   - /* This is the legacy signal stack switching. */
239   - else if (!user_mode(regs) &&
240   - !(ka->sa.sa_flags & SA_RESTORER) &&
241   - ka->sa.sa_restorer) {
242   - sp = (unsigned long) ka->sa.sa_restorer;
243   - }
244   -
245 238 return (void __user *)((sp - frame_size) & -8ul);
246 239 }
247 240  
... ... @@ -413,15 +406,6 @@
413 406 int signr;
414 407 struct k_sigaction ka;
415 408 sigset_t *oldset;
416   -
417   - /*
418   - * We want the common case to go fast, which
419   - * is why we may in certain cases get here from
420   - * kernel mode. Just return without doing anything
421   - * if so.
422   - */
423   - if (!user_mode(regs))
424   - return;
425 409  
426 410 if (test_thread_flag(TIF_RESTORE_SIGMASK))
427 411 oldset = &current->saved_sigmask;