linux-kernel - [tip: x86/core] x86/percpu: Fix __per_cpu_hot

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Message-ID: <174111683652.14745.17782690579153562758.tip-bot2@tip-bot2>
Date: Tue, 04 Mar 2025 19:33:56 -0000
From: "tip-bot2 for Uros Bizjak" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Ingo Molnar <mingo@...nel.org>, Uros Bizjak <ubizjak@...il.com>,
 Brian Gerst <brgerst@...il.com>, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: x86/core] x86/percpu: Fix __per_cpu_hot_end marker

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

Commit-ID:     d99d0dea2fabf3f7538dd3a19b43b9aea4468037
Gitweb:        https://git.kernel.org/tip/d99d0dea2fabf3f7538dd3a19b43b9aea4468037
Author:        Uros Bizjak <ubizjak@...il.com>
AuthorDate:    Tue, 04 Mar 2025 18:34:36 +01:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 04 Mar 2025 20:18:02 +01:00

x86/percpu: Fix __per_cpu_hot_end marker

Make __per_cpu_hot_end marker point to the end of the percpu cache
hot data, not to the end of the percpu cache hot section.

This fixes CONFIG_MPENTIUM4 case where X86_L1_CACHE_SHIFT
is set to 7 (128 bytes).

Also update assert message accordingly.

Reported-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Brian Gerst <brgerst@...il.com>
Link: https://lore.kernel.org/r/20250304173455.89361-1-ubizjak@gmail.com

Closes: https://lore.kernel.org/lkml/Z8a-NVJs-pm5W-mG@gmail.com/
---
 arch/x86/kernel/vmlinux.lds.S     | 2 +-
 include/asm-generic/vmlinux.lds.h | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 31f9102..ccdc45e 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -331,7 +331,7 @@ SECTIONS
 	}
 
 	PERCPU_SECTION(L1_CACHE_BYTES)
-	ASSERT(__per_cpu_hot_end - __per_cpu_hot_start <= 64, "percpu cache hot section too large")
+	ASSERT(__per_cpu_hot_end - __per_cpu_hot_start <= 64, "percpu cache hot data too large")
 
 	RUNTIME_CONST_VARIABLES
 	RUNTIME_CONST(ptr, USER_PTR_MAX)
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index c4e8fac..4925441 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -1072,9 +1072,8 @@ defined(CONFIG_AUTOFDO_CLANG) || defined(CONFIG_PROPELLER_CLANG)
 	. = ALIGN(cacheline);						\
 	__per_cpu_hot_start = .;					\
 	*(SORT_BY_ALIGNMENT(.data..percpu..hot.*))			\
-	__per_cpu_hot_pad = .;						\
-	. = ALIGN(cacheline);						\
 	__per_cpu_hot_end = .;						\
+	. = ALIGN(cacheline);						\
 	*(.data..percpu..read_mostly)					\
 	. = ALIGN(cacheline);						\
 	*(.data..percpu)						\