linux-kernel - [PATCH RFC v3 5/8] rseq: add __always_inline for rseq_kernel

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Message-Id: <20250429-noautoinline-v3-5-4c49f28ea5b5@uniontech.com>
Date: Tue, 29 Apr 2025 12:06:09 +0800
From: Chen Linxuan via B4 Relay <devnull+chenlinxuan.uniontech.com@...nel.org>
To: Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...nel.dk>, 
 Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>, 
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Cc: linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-mm@...ck.org, kvm@...r.kernel.org, virtualization@...ts.linux.dev, 
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 Chen Linxuan <chenlinxuan@...ontech.com>, 
 Changbin Du <changbin.du@...el.com>
Subject: [PATCH RFC v3 5/8] rseq: add __always_inline for
 rseq_kernel_fields

From: Chen Linxuan <chenlinxuan@...ontech.com>

Presume that kernel is compiled for x86_64 with gcc version 13.3.0:

  make allmodconfig
  make KCFLAGS="-fno-inline-small-functions -fno-inline-functions-called-once"

This results some objtool warnings:

  vmlinux.o: warning: objtool: rseq_update_cpu_node_id+0x14c: call to rseq_kernel_fields() with UACCESS enabled
  vmlinux.o: warning: objtool: rseq_reset_rseq_cpu_node_id+0xef: call to rseq_kernel_fields() with UACCESS enabled

Signed-off-by: Chen Linxuan <chenlinxuan@...ontech.com>
---
 kernel/rseq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rseq.c b/kernel/rseq.c
index b7a1ec327e8117b47e353cab92d62111dd261520..7a4b6c211359714087a753047581bc8ff0c6c76b 100644
--- a/kernel/rseq.c
+++ b/kernel/rseq.c
@@ -27,7 +27,7 @@
 				  RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE)

 #ifdef CONFIG_DEBUG_RSEQ
-static struct rseq *rseq_kernel_fields(struct task_struct *t)
+static __always_inline struct rseq *rseq_kernel_fields(struct task_struct *t)
 {
 	return (struct rseq *) t->rseq_fields;
 }

-- 
2.43.0