linux-kernel - [PATCH v2 1/8] execmem: drop unused execmem_update

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Message-ID: <20250709134933.3848895-2-rppt@kernel.org>
Date: Wed,  9 Jul 2025 16:49:26 +0300
From: Mike Rapoport <rppt@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Daniel Gomez <da.gomez@...sung.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mike Rapoport <rppt@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Petr Pavlu <petr.pavlu@...e.com>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yann Ylavic <ylavic.dev@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	linux-modules@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	x86@...nel.org
Subject: [PATCH v2 1/8] execmem: drop unused execmem_update_copy()

From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>

The execmem_update_copy() that used text poking was required when memory
allocated from ROX cache was always read-only. Since now its permissions
can be switched to read-write there is no need in a function that updates
memory with text poking.

Remove it.

Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
---
 include/linux/execmem.h | 13 -------------
 mm/execmem.c            |  5 -----
 2 files changed, 18 deletions(-)

diff --git a/include/linux/execmem.h b/include/linux/execmem.h
index 3be35680a54f..734fbe83d98e 100644
--- a/include/linux/execmem.h
+++ b/include/linux/execmem.h
@@ -185,19 +185,6 @@ DEFINE_FREE(execmem, void *, if (_T) execmem_free(_T));
 struct vm_struct *execmem_vmap(size_t size);
 #endif
 
-/**
- * execmem_update_copy - copy an update to executable memory
- * @dst:  destination address to update
- * @src:  source address containing the data
- * @size: how many bytes of memory shold be copied
- *
- * Copy @size bytes from @src to @dst using text poking if the memory at
- * @dst is read-only.
- *
- * Return: a pointer to @dst or NULL on error
- */
-void *execmem_update_copy(void *dst, const void *src, size_t size);
-
 /**
  * execmem_is_rox - check if execmem is read-only
  * @type - the execmem type to check
diff --git a/mm/execmem.c b/mm/execmem.c
index 2b683e7d864d..0712ebb4eb77 100644
--- a/mm/execmem.c
+++ b/mm/execmem.c
@@ -399,11 +399,6 @@ void execmem_free(void *ptr)
 		vfree(ptr);
 }
 
-void *execmem_update_copy(void *dst, const void *src, size_t size)
-{
-	return text_poke_copy(dst, src, size);
-}
-
 bool execmem_is_rox(enum execmem_type type)
 {
 	return !!(execmem_info->ranges[type].flags & EXECMEM_ROX_CACHE);
-- 
2.47.2