linux-kernel - [PATCH 1/4] extable: add __sort_main

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Date:   Wed, 22 Nov 2023 17:28:52 +0800
From:   Huang Shijie <shijie@...amperecomputing.com>
To:     catalin.marinas@....com
Cc:     will@...nel.org, mark.rutland@....com, suzuki.poulose@....com,
        broonie@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, anshuman.khandual@....com,
        robh@...nel.org, oliver.upton@...ux.dev, maz@...nel.org,
        patches@...erecomputing.com,
        Huang Shijie <shijie@...amperecomputing.com>
Subject: [PATCH 1/4] extable: add __sort_main_extable

The AmpereOne chip(arm64) may change the kernel exception table at
boot time, so it needs to sort the kernel extable table during
the kernel boot.

Introduce __sort_main_extable which is used to sort the kernel
exception table.

Signed-off-by: Huang Shijie <shijie@...amperecomputing.com>
---
 include/linux/extable.h | 2 ++
 kernel/extable.c        | 8 +++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/linux/extable.h b/include/linux/extable.h
index 4ab9e78f313b..ef70ec3633b0 100644
--- a/include/linux/extable.h
+++ b/include/linux/extable.h
@@ -15,6 +15,8 @@ search_extable(const struct exception_table_entry *base,
 void sort_extable(struct exception_table_entry *start,
 		  struct exception_table_entry *finish);
 void sort_main_extable(void);
+void __sort_main_extable(void);
+
 void trim_init_extable(struct module *m);
 
 /* Given an address, look for it in the exception tables */
diff --git a/kernel/extable.c b/kernel/extable.c
index 71f482581cab..0fbe0ccb1c3a 100644
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -32,13 +32,19 @@ extern struct exception_table_entry __stop___ex_table[];
 /* Cleared by build time tools if the table is already sorted. */
 u32 __initdata __visible main_extable_sort_needed = 1;
 
+void __sort_main_extable(void)
+{
+	if (&__stop___ex_table > &__start___ex_table)
+		sort_extable(__start___ex_table, __stop___ex_table);
+}
+
 /* Sort the kernel's built-in exception table */
 void __init sort_main_extable(void)
 {
 	if (main_extable_sort_needed &&
 	    &__stop___ex_table > &__start___ex_table) {
 		pr_notice("Sorting __ex_table...\n");
-		sort_extable(__start___ex_table, __stop___ex_table);
+		__sort_main_extable();
 	}
 }
 
-- 
2.40.1