linux-kernel - [REVIEW][PATCH 09/15] signal/arm64: Only call set_thread_esr once in do_page

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Date:   Mon, 24 Sep 2018 11:10:09 +0200
From:   "Eric W. Biederman" <ebiederm@...ssion.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arch@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        linux-arm-kernel@...ts.infradead.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [REVIEW][PATCH 09/15] signal/arm64: Only call set_thread_esr once in do_page_fault

This code is truly common between the signal sending cases so share it.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 arch/arm64/mm/fault.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index ab85533e2255..959c4a565c8e 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -564,6 +564,7 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
 	}
 
 	inf = esr_to_fault_info(esr);
+	set_thread_esr(addr, esr);
 	if (fault & VM_FAULT_SIGBUS) {
 		/*
 		 * We had some memory, but were unable to successfully fix up
@@ -573,7 +574,6 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
 		si.si_signo	= SIGBUS;
 		si.si_code	= BUS_ADRERR;
 		si.si_addr = (void __user *)addr;
-		set_thread_esr(addr, esr);
 		arm64_force_sig_info(&si, inf->name);
 	} else if (fault & (VM_FAULT_HWPOISON_LARGE | VM_FAULT_HWPOISON)) {
 		unsigned int lsb;
@@ -587,7 +587,6 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
 		si.si_code	= BUS_MCEERR_AR;
 		si.si_addr = (void __user *)addr;
 		si.si_addr_lsb	= lsb;
-		set_thread_esr(addr, esr);
 		arm64_force_sig_info(&si, inf->name);
 	} else {
 		/*
@@ -599,7 +598,6 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
 		si.si_code	= fault == VM_FAULT_BADACCESS ?
 				  SEGV_ACCERR : SEGV_MAPERR;
 		si.si_addr = (void __user *)addr;
-		set_thread_esr(addr, esr);
 		arm64_force_sig_info(&si, inf->name);
 	}
 
-- 
2.17.1