add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/sparc/kernel/signal32.c
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@@ -24,7 +24,6 @@
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 #include <linux/uaccess.h>
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 #include <asm/ptrace.h>
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-#include <asm/pgtable.h>
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 #include <asm/psrcompat.h>
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 #include <asm/fpumacro.h>
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 #include <asm/visasm.h>
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@@ -170,7 +169,7 @@
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 	return;
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 segv:
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-	force_sig(SIGSEGV, current);
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+	force_sig(SIGSEGV);
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 }
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 asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
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@@ -256,7 +255,7 @@
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 	set_current_blocked(&set);
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 	return;
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 segv:
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-	force_sig(SIGSEGV, current);
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+	force_sig(SIGSEGV);
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 }
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 static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
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@@ -299,6 +298,7 @@
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 	unsigned long pstate, paddr;
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 	pte_t *ptep, pte;
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 	pgd_t *pgdp;
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+	p4d_t *p4dp;
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 	pud_t *pudp;
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 	pmd_t *pmdp;
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@@ -318,7 +318,10 @@
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 	pgdp = pgd_offset(current->mm, address);
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 	if (pgd_none(*pgdp))
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 		goto out_irqs_on;
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-	pudp = pud_offset(pgdp, address);
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+	p4dp = p4d_offset(pgdp, address);
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+	if (p4d_none(*p4dp))
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+		goto out_irqs_on;
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+	pudp = pud_offset(p4dp, address);
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 	if (pud_none(*pudp))
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 		goto out_irqs_on;
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 	pmdp = pmd_offset(pudp, address);
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@@ -375,7 +378,7 @@
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 			pr_info("%s[%d] bad frame in setup_frame32: %08lx TPC %08lx O7 %08lx\n",
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 				current->comm, current->pid, (unsigned long)sf,
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 				regs->tpc, regs->u_regs[UREG_I7]);
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-		force_sigsegv(ksig->sig, current);
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+		force_sigsegv(ksig->sig);
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 		return -EINVAL;
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 	}
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@@ -509,7 +512,7 @@
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 			pr_info("%s[%d] bad frame in setup_rt_frame32: %08lx TPC %08lx O7 %08lx\n",
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 				current->comm, current->pid, (unsigned long)sf,
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 				regs->tpc, regs->u_regs[UREG_I7]);
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-		force_sigsegv(ksig->sig, current);
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+		force_sigsegv(ksig->sig);
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 		return -EINVAL;
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 	}
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@@ -643,7 +646,7 @@
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 	case ERESTARTSYS:
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 		if (!(sa->sa_flags & SA_RESTART))
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 			goto no_system_call_restart;
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-		/* fallthrough */
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+		fallthrough;
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 	case ERESTARTNOINTR:
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 		regs->u_regs[UREG_I0] = orig_i0;
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 		regs->tpc -= 4;
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@@ -683,6 +686,7 @@
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 				regs->tpc -= 4;
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 				regs->tnpc -= 4;
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 				pt_regs_clear_syscall(regs);
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+				fallthrough;
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 			case ERESTART_RESTARTBLOCK:
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 				regs->u_regs[UREG_G1] = __NR_restart_syscall;
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 				regs->tpc -= 4;