linux-kernel - [PATCH] arm: mm: remove set_kernel_text

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Message-ID: <20210324175424.065b90bb@xhacker.debian>
Date:   Wed, 24 Mar 2021 17:54:24 +0800
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     Russell King <linux@...linux.org.uk>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] arm: mm: remove set_kernel_text_r[ow]()

After commit 5a735583b764 ("arm/ftrace: Use __patch_text()"), the last
and only user of these functions has gone, remove them.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
---
 arch/arm/include/asm/set_memory.h |  8 --------
 arch/arm/mm/init.c                | 21 ---------------------
 2 files changed, 29 deletions(-)

diff --git a/arch/arm/include/asm/set_memory.h b/arch/arm/include/asm/set_memory.h
index a1ceff4295d3..ec17fc0fda7a 100644
--- a/arch/arm/include/asm/set_memory.h
+++ b/arch/arm/include/asm/set_memory.h
@@ -18,12 +18,4 @@ static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
 static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
 #endif
 
-#ifdef CONFIG_STRICT_KERNEL_RWX
-void set_kernel_text_rw(void);
-void set_kernel_text_ro(void);
-#else
-static inline void set_kernel_text_rw(void) { }
-static inline void set_kernel_text_ro(void) { }
-#endif
-
 #endif
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 828a2561b229..039c19597c7a 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -487,33 +487,12 @@ static int __mark_rodata_ro(void *unused)
 	return 0;
 }
 
-static int kernel_set_to_readonly __read_mostly;
-
 void mark_rodata_ro(void)
 {
-	kernel_set_to_readonly = 1;
 	stop_machine(__mark_rodata_ro, NULL, NULL);
 	debug_checkwx();
 }
 
-void set_kernel_text_rw(void)
-{
-	if (!kernel_set_to_readonly)
-		return;
-
-	set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), false,
-				current->active_mm);
-}
-
-void set_kernel_text_ro(void)
-{
-	if (!kernel_set_to_readonly)
-		return;
-
-	set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), true,
-				current->active_mm);
-}
-
 #else
 static inline void fix_kernmem_perms(void) { }
 #endif /* CONFIG_STRICT_KERNEL_RWX */
-- 
2.31.0