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Message-Id: <20190815003941.18655-5-santosh@fossix.org>
Date: Thu, 15 Aug 2019 06:09:38 +0530
From: Santosh Sivaraj <santosh@...six.org>
To: linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
Linux Kernel <linux-kernel@...r.kernel.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
Mahesh Salgaonkar <mahesh@...ux.ibm.com>,
Reza Arbab <arbab@...ux.ibm.com>,
Balbir Singh <bsingharora@...il.com>,
Chandan Rajendra <chandan@...ux.ibm.com>,
Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
christophe leroy <christophe.leroy@....fr>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...nel.org>
Subject: [PATCH v10 4/7] extable: Add function to search only kernel exception table
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@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Nicholas Piggin <npiggin@...il.com>
Signed-off-by: Santosh Sivaraj <santosh@...six.org>
Reviewed-by: Nicholas Piggin <npiggin@...il.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
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