linux-kernel - [PATCH v2 07/10] um: Remove unused ipi_pipe field from cpuinfo

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Message-Id: <20250810055136.897712-8-tiwei.bie@linux.dev>
Date: Sun, 10 Aug 2025 13:51:33 +0800
From: Tiwei Bie <tiwei.bie@...ux.dev>
To: richard@....at,
	anton.ivanov@...bridgegreys.com,
	johannes@...solutions.net
Cc: linux-um@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	benjamin@...solutions.net,
	arnd@...db.de,
	tiwei.btw@...group.com,
	tiwei.bie@...ux.dev
Subject: [PATCH v2 07/10] um: Remove unused ipi_pipe field from cpuinfo_um

From: Tiwei Bie <tiwei.btw@...group.com>

It's no longer used after the removal of the SMP implementation in
TT mode by commit 28fa468f5316 ("um: Remove broken SMP support").

While at it, remove the outdated comment.

Signed-off-by: Tiwei Bie <tiwei.btw@...group.com>
---
 arch/um/include/asm/processor-generic.h | 1 -
 arch/um/kernel/um_arch.c                | 3 ---
 2 files changed, 4 deletions(-)

diff --git a/arch/um/include/asm/processor-generic.h b/arch/um/include/asm/processor-generic.h
index 236fdfd7cdbe..7854d51b6639 100644
--- a/arch/um/include/asm/processor-generic.h
+++ b/arch/um/include/asm/processor-generic.h
@@ -71,7 +71,6 @@ extern void start_thread(struct pt_regs *regs, unsigned long entry,
 
 struct cpuinfo_um {
 	unsigned long loops_per_jiffy;
-	int ipi_pipe[2];
 	int cache_alignment;
 	union {
 		__u32		x86_capability[NCAPINTS + NBUGINTS];
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index 2f5ee045bc7a..e46718b3c711 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -54,12 +54,9 @@ static void __init add_arg(char *arg)
 
 /*
  * These fields are initialized at boot time and not changed.
- * XXX This structure is used only in the non-SMP case.  Maybe this
- * should be moved to smp.c.
  */
 struct cpuinfo_um boot_cpu_data = {
 	.loops_per_jiffy	= 0,
-	.ipi_pipe		= { -1, -1 },
 	.cache_alignment	= L1_CACHE_BYTES,
 	.x86_capability		= { 0 }
 };
-- 
2.34.1