linux-kernel - [PATCH 31/41] x86/alternatives: Simplify text_poke_int3

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Message-ID: <20250327205355.378659-32-mingo@kernel.org>
Date: Thu, 27 Mar 2025 21:53:44 +0100
From: Ingo Molnar <mingo@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Juergen Gross <jgross@...e.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 31/41] x86/alternatives: Simplify text_poke_int3_handler()

Remove the 'desc' local variable indirection and use
tp_array directly.

Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/alternative.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 244119066672..9402826e2903 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -2511,7 +2511,6 @@ static __always_inline int patch_cmp(const void *key, const void *elt)
 
 noinstr int text_poke_int3_handler(struct pt_regs *regs)
 {
-	struct text_poke_int3_array *desc;
 	struct text_poke_int3_loc *tp;
 	int ret = 0;
 	void *ip;
@@ -2531,9 +2530,6 @@ noinstr int text_poke_int3_handler(struct pt_regs *regs)
 
 	if (!try_get_tp_array())
 		return 0;
-	desc = &tp_array;
-
-	WARN_ON_ONCE(desc->vec != tp_array.vec);
 
 	/*
 	 * Discount the INT3. See text_poke_int3_batch().
@@ -2543,14 +2539,14 @@ noinstr int text_poke_int3_handler(struct pt_regs *regs)
 	/*
 	 * Skip the binary search if there is a single member in the vector.
 	 */
-	if (unlikely(desc->nr_entries > 1)) {
-		tp = __inline_bsearch(ip, desc->vec, desc->nr_entries,
+	if (unlikely(tp_array.nr_entries > 1)) {
+		tp = __inline_bsearch(ip, tp_array.vec, tp_array.nr_entries,
 				      sizeof(struct text_poke_int3_loc),
 				      patch_cmp);
 		if (!tp)
 			goto out_put;
 	} else {
-		tp = desc->vec;
+		tp = tp_array.vec;
 		if (text_poke_int3_addr(tp) != ip)
 			goto out_put;
 	}
-- 
2.45.2