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From: Santosh Sivaraj <santosh@fossix.org>
To: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	Linux Kernel <linux-kernel@vger.kernel.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
	Mahesh Salgaonkar <mahesh@linux.ibm.com>,
	Reza Arbab <arbab@linux.ibm.com>,
	Chandan Rajendra <chandan@linux.ibm.com>,
	Nicholas Piggin <npiggin@gmail.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@kernel.org>
Subject: [PATCH v11 4/7] extable: Add function to search only kernel exception table
Date: Tue, 20 Aug 2019 13:43:49 +0530	[thread overview]
Message-ID: <20190820081352.8641-5-santosh@fossix.org> (raw)
In-Reply-To: <20190820081352.8641-1-santosh@fossix.org>

Certain architecture specific operating modes (e.g., in powerpc machine
check handler that is unable to access vmalloc memory), the
search_exception_tables cannot be called because it also searches the
module exception tables if entry is not found in the kernel exception
table.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
---
 include/linux/extable.h |  2 ++
 kernel/extable.c        | 11 +++++++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/include/linux/extable.h b/include/linux/extable.h
index 41c5b3a25f67..81ecfaa83ad3 100644
--- a/include/linux/extable.h
+++ b/include/linux/extable.h
@@ -19,6 +19,8 @@ void trim_init_extable(struct module *m);
 
 /* Given an address, look for it in the exception tables */
 const struct exception_table_entry *search_exception_tables(unsigned long add);
+const struct exception_table_entry *
+search_kernel_exception_table(unsigned long addr);
 
 #ifdef CONFIG_MODULES
 /* For extable.c to search modules' exception tables. */
diff --git a/kernel/extable.c b/kernel/extable.c
index e23cce6e6092..f6c9406eec7d 100644
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -40,13 +40,20 @@ void __init sort_main_extable(void)
 	}
 }
 
+/* Given an address, look for it in the kernel exception table */
+const
+struct exception_table_entry *search_kernel_exception_table(unsigned long addr)
+{
+	return search_extable(__start___ex_table,
+			      __stop___ex_table - __start___ex_table, addr);
+}
+
 /* Given an address, look for it in the exception tables. */
 const struct exception_table_entry *search_exception_tables(unsigned long addr)
 {
 	const struct exception_table_entry *e;
 
-	e = search_extable(__start___ex_table,
-			   __stop___ex_table - __start___ex_table, addr);
+	e = search_kernel_exception_table(addr);
 	if (!e)
 		e = search_module_extables(addr);
 	return e;
-- 
2.21.0


  parent reply	other threads:[~2019-08-20  8:14 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-20  8:13 [PATCH v11 0/7] powerpc: implement machine check safe memcpy Santosh Sivaraj
2019-08-20  8:13 ` [PATCH v11 1/7] powerpc/mce: Schedule work from irq_work Santosh Sivaraj
2019-08-22 13:09   ` Michael Ellerman
2019-08-20  8:13 ` [PATCH v11 2/7] powerpc/mce: Fix MCE handling for huge pages Santosh Sivaraj
2019-08-20  8:13 ` [PATCH v11 3/7] powerpc/mce: Make machine_check_ue_event() static Santosh Sivaraj
2019-08-20  8:13 ` Santosh Sivaraj [this message]
2019-08-20  8:13 ` [PATCH v11 5/7] powerpc/mce: Handle UE event for memcpy_mcsafe Santosh Sivaraj
2019-08-20  8:13 ` [PATCH v11 6/7] powerpc/memcpy: Add memcpy_mcsafe for pmem Santosh Sivaraj
2019-08-20  8:13 ` [PATCH v11 7/7] powerpc: add machine check safe copy_to_user Santosh Sivaraj

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