linux-kernel - [PATCH] x86/alternatives: Make smp_text_poke_batch_process subsume smp_text_poke_batch

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Message-ID: <20250403153956.1913607-1-nik.borisov@suse.com>
Date: Thu,  3 Apr 2025 18:39:56 +0300
From: Nikolay Borisov <nik.borisov@...e.com>
To: mingo@...nel.org
Cc: x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Nikolay Borisov <nik.borisov@...e.com>
Subject: [PATCH] x86/alternatives: Make smp_text_poke_batch_process subsume smp_text_poke_batch_finish

Simplify the alternatives interface some more by moving the
poke_batch_finish check into poke_batch_process and renaming the latter.
The net effect is one less function name to consider when reading the
code.

Signed-off-by: Nikolay Borisov <nik.borisov@...e.com>
---
 arch/x86/kernel/alternative.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 5b1a6252a4b9..a5ecaebe1ea9 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -2434,7 +2434,7 @@ struct smp_text_poke_loc {
 	u8 len;
 	u8 opcode;
 	const u8 text[TEXT_POKE_MAX_OPCODE_SIZE];
-	/* see smp_text_poke_batch_process() */
+	/* see smp_text_poke_batch_finish() */
 	u8 old;
 };
 
@@ -2507,7 +2507,7 @@ noinstr int smp_text_poke_int3_trap_handler(struct pt_regs *regs)
 		return 0;
 
 	/*
-	 * Discount the INT3. See smp_text_poke_batch_process().
+	 * Discount the INT3. See smp_text_poke_batch_finish().
 	 */
 	ip = (void *) regs->ip - INT3_INSN_SIZE;
 
@@ -2565,7 +2565,7 @@ noinstr int smp_text_poke_int3_trap_handler(struct pt_regs *regs)
 }
 
 /**
- * smp_text_poke_batch_process() -- update instructions on live kernel on SMP
+ * smp_text_poke_batch_finish() -- update instructions on live kernel on SMP
  *
  * Input state:
  *  text_poke_array.vec: vector of instructions to patch
@@ -2587,12 +2587,16 @@ noinstr int smp_text_poke_int3_trap_handler(struct pt_regs *regs)
  *		  replacing opcode
  *	- SMP sync all CPUs
  */
-static void smp_text_poke_batch_process(void)
+void smp_text_poke_batch_finish(void)
 {
 	unsigned char int3 = INT3_INSN_OPCODE;
 	unsigned int i;
 	int do_sync;
 
+
+	if (!text_poke_array.nr_entries)
+		return;
+
 	lockdep_assert_held(&text_mutex);
 
 	/*
@@ -2832,12 +2836,6 @@ static bool text_poke_addr_ordered(void *addr)
 	return true;
 }
 
-void smp_text_poke_batch_finish(void)
-{
-	if (text_poke_array.nr_entries)
-		smp_text_poke_batch_process();
-}
-
 /**
  * smp_text_poke_batch_add() -- update instruction on live kernel on SMP, batched
  * @addr:	address to patch
@@ -2854,7 +2852,7 @@ void smp_text_poke_batch_finish(void)
 void __ref smp_text_poke_batch_add(void *addr, const void *opcode, size_t len, const void *emulate)
 {
 	if (text_poke_array.nr_entries == TEXT_POKE_ARRAY_MAX || !text_poke_addr_ordered(addr))
-		smp_text_poke_batch_process();
+		smp_text_poke_batch_finish();
 	__smp_text_poke_batch_add(addr, opcode, len, emulate);
 }
 
-- 
2.43.0