linux-kernel - [REVIEW][PATCH 1/9] signal/powerpc: Use force_sig

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Date:   Tue, 18 Sep 2018 19:58:42 +0200
From:   "Eric W. Biederman" <ebiederm@...ssion.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arch@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [REVIEW][PATCH 1/9] signal/powerpc: Use force_sig_mceerr as appropriate

In do_sigbus isolate the mceerr signaling code and call
force_sig_mceerr instead of falling through to the force_sig_info that
works for all of the other signals.

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 arch/powerpc/mm/fault.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index d51cf5f4e45e..22d7f8748cd7 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -158,7 +158,6 @@ static int do_sigbus(struct pt_regs *regs, unsigned long address,
 		     vm_fault_t fault)
 {
 	siginfo_t info;
-	unsigned int lsb = 0;
 
 	if (!user_mode(regs))
 		return SIGBUS;
@@ -171,17 +170,22 @@ static int do_sigbus(struct pt_regs *regs, unsigned long address,
 	info.si_addr = (void __user *)address;
 #ifdef CONFIG_MEMORY_FAILURE
 	if (fault & (VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LARGE)) {
+		unsigned int lsb = 0; /* shutup gcc */
+
 		pr_err("MCE: Killing %s:%d due to hardware memory corruption fault at %lx\n",
 			current->comm, current->pid, address);
-		info.si_code = BUS_MCEERR_AR;
+
+		if (fault & VM_FAULT_HWPOISON_LARGE)
+			lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault));
+		if (fault & VM_FAULT_HWPOISON)
+			lsb = PAGE_SHIFT;
+
+		force_sig_mceerr(BUS_MCEERR_AR, (void __user *)address, lsb,
+				 current);
+		return 0;
 	}
 
-	if (fault & VM_FAULT_HWPOISON_LARGE)
-		lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault));
-	if (fault & VM_FAULT_HWPOISON)
-		lsb = PAGE_SHIFT;
 #endif
-	info.si_addr_lsb = lsb;
 	force_sig_info(SIGBUS, &info, current);
 	return 0;
 }
-- 
2.17.1