linux-kernel - [tip: x86/alternatives] x86/alternatives: Add documentation for smp_text_poke_batch

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <174436571165.31282.9373988080368433343.tip-bot2@tip-bot2>
Date: Fri, 11 Apr 2025 10:01:51 -0000
From: "tip-bot2 for Ingo Molnar" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Ingo Molnar <mingo@...nel.org>, Juergen Gross <jgross@...e.com>,
 "H . Peter Anvin" <hpa@...or.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>,
 Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: x86/alternatives] x86/alternatives: Add documentation for
 smp_text_poke_batch_add()

The following commit has been merged into the x86/alternatives branch of tip:

Commit-ID:     cca3473956be6ca5c7ad5d2ced5516eb509c1936
Gitweb:        https://git.kernel.org/tip/cca3473956be6ca5c7ad5d2ced5516eb509c1936
Author:        Ingo Molnar <mingo@...nel.org>
AuthorDate:    Fri, 11 Apr 2025 07:40:50 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Fri, 11 Apr 2025 11:01:34 +02:00

x86/alternatives: Add documentation for smp_text_poke_batch_add()

Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Juergen Gross <jgross@...e.com>
Cc: "H . Peter Anvin" <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: https://lore.kernel.org/r/20250411054105.2341982-39-mingo@kernel.org
---
 arch/x86/kernel/alternative.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index a9726cc..b47ad08 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -2873,6 +2873,19 @@ static void smp_text_poke_batch_flush(void *addr)
 	}
 }
 
+/**
+ * smp_text_poke_batch_add() -- update instruction on live kernel on SMP, batched
+ * @addr:	address to patch
+ * @opcode:	opcode of new instruction
+ * @len:	length to copy
+ * @emulate:	instruction to be emulated
+ *
+ * Add a new instruction to the current queue of to-be-patched instructions
+ * the kernel maintains. The patching request will not be executed immediately,
+ * but becomes part of an array of patching requests, optimized for batched
+ * execution. All pending patching requests will be executed on the next
+ * smp_text_poke_batch_finish() call.
+ */
 void __ref smp_text_poke_batch_add(void *addr, const void *opcode, size_t len, const void *emulate)
 {
 	smp_text_poke_batch_flush(addr);