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>, Balbir Singh <bsingharora@gmail.com>, Chandan Rajendra <chandan@linux.vnet.ibm.com>, Michael Ellerman <mpe@ellerman.id.au>, Nicholas Piggin <npiggin@gmail.com>, christophe leroy <christophe.leroy@c-s.fr>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@kernel.org> Subject: [PATCH v8 4/7] extable: Add function to search only kernel exception table Date: Wed, 7 Aug 2019 20:26:57 +0530 [thread overview] Message-ID: <20190807145700.25599-5-santosh@fossix.org> (raw) In-Reply-To: <20190807145700.25599-1-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; -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
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>, Nicholas Piggin <npiggin@gmail.com>, Chandan Rajendra <chandan@linux.vnet.ibm.com>, Thomas Gleixner <tglx@linutronix.de>, Reza Arbab <arbab@linux.ibm.com>, Ingo Molnar <mingo@kernel.org> Subject: [PATCH v8 4/7] extable: Add function to search only kernel exception table Date: Wed, 7 Aug 2019 20:26:57 +0530 [thread overview] Message-ID: <20190807145700.25599-5-santosh@fossix.org> (raw) In-Reply-To: <20190807145700.25599-1-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; -- 2.20.1
next prev parent reply other threads:[~2019-08-07 14:57 UTC|newest] Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-08-07 14:56 [PATCH v8 0/7] powerpc: implement machine check safe memcpy Santosh Sivaraj 2019-08-07 14:56 ` Santosh Sivaraj 2019-08-07 14:56 ` [PATCH v8 1/7] powerpc/mce: Schedule work from irq_work Santosh Sivaraj 2019-08-07 14:56 ` Santosh Sivaraj 2019-08-09 18:55 ` Mahesh Jagannath Salgaonkar 2019-08-09 18:55 ` Mahesh Jagannath Salgaonkar 2019-08-07 14:56 ` [PATCH v8 2/7] powerpc/mce: Make machine_check_ue_event() static Santosh Sivaraj 2019-08-07 14:56 ` Santosh Sivaraj 2019-08-07 14:56 ` [PATCH v8 3/7] powerpc/mce: Fix MCE handling for huge pages Santosh Sivaraj 2019-08-07 14:56 ` Santosh Sivaraj 2019-08-09 19:06 ` Mahesh Jagannath Salgaonkar 2019-08-09 19:06 ` Mahesh Jagannath Salgaonkar 2019-08-11 1:32 ` Santosh Sivaraj 2019-08-11 1:32 ` Santosh Sivaraj 2019-08-07 14:56 ` Santosh Sivaraj [this message] 2019-08-07 14:56 ` [PATCH v8 4/7] extable: Add function to search only kernel exception table Santosh Sivaraj 2019-08-07 14:56 ` [PATCH v8 5/7] powerpc/memcpy: Add memcpy_mcsafe for pmem Santosh Sivaraj 2019-08-07 14:56 ` Santosh Sivaraj 2019-08-07 14:56 ` [PATCH v8 6/7] powerpc/mce: Handle UE event for memcpy_mcsafe Santosh Sivaraj 2019-08-07 14:56 ` Santosh Sivaraj 2019-08-07 14:57 ` [PATCH v8 7/7] powerpc: add machine check safe copy_to_user Santosh Sivaraj 2019-08-07 14:57 ` Santosh Sivaraj 2019-08-10 9:33 ` Michael Ellerman 2019-08-10 9:33 ` Michael Ellerman 2019-08-11 1:35 ` Santosh Sivaraj 2019-08-11 1:35 ` Santosh Sivaraj
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