linux-kernel - [PATCH 3/7] arch: Replace get_task

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Message-Id: <20241213054610.55843-4-laoar.shao@gmail.com>
Date: Fri, 13 Dec 2024 13:46:06 +0800
From: Yafang Shao <laoar.shao@...il.com>
To: torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	x86@...nel.org,
	linux-snps-arc@...ts.infradead.org,
	linux-wireless@...r.kernel.org,
	intel-gfx@...ts.freedesktop.org,
	intel-xe@...ts.freedesktop.org,
	nouveau@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	ocfs2-devel@...ts.linux.dev,
	Yafang Shao <laoar.shao@...il.com>,
	Vineet Gupta <vgupta@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH 3/7] arch: Replace get_task_comm() with %pTN

Since task->comm is guaranteed to be NUL-terminated, we can print it
directly without the need to copy it into a separate buffer. This
simplifies the code and avoids unnecessary operations.

Signed-off-by: Yafang Shao <laoar.shao@...il.com>
Cc: Vineet Gupta <vgupta@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
---
 arch/arc/kernel/unaligned.c | 9 ++++-----
 arch/x86/kernel/vm86_32.c   | 5 ++---
 2 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/arch/arc/kernel/unaligned.c b/arch/arc/kernel/unaligned.c
index d2f5ceaaed1b..fb8e995823e3 100644
--- a/arch/arc/kernel/unaligned.c
+++ b/arch/arc/kernel/unaligned.c
@@ -200,23 +200,22 @@ int misaligned_fixup(unsigned long address, struct pt_regs *regs,
 		     struct callee_regs *cregs)
 {
 	struct disasm_state state;
-	char buf[TASK_COMM_LEN];
 
 	/* handle user mode only and only if enabled by sysadmin */
 	if (!user_mode(regs) || !unaligned_enabled)
 		return 1;
 
 	if (no_unaligned_warning) {
-		pr_warn_once("%s(%d) made unaligned access which was emulated"
+		pr_warn_once("%pTN(%d) made unaligned access which was emulated"
 			     " by kernel assist\n. This can degrade application"
 			     " performance significantly\n. To enable further"
 			     " logging of such instances, please \n"
 			     " echo 0 > /proc/sys/kernel/ignore-unaligned-usertrap\n",
-			     get_task_comm(buf, current), task_pid_nr(current));
+			     current, task_pid_nr(current));
 	} else {
 		/* Add rate limiting if it gets down to it */
-		pr_warn("%s(%d): unaligned access to/from 0x%lx by PC: 0x%lx\n",
-			get_task_comm(buf, current), task_pid_nr(current),
+		pr_warn("%pTN(%d): unaligned access to/from 0x%lx by PC: 0x%lx\n",
+			current, task_pid_nr(current),
 			address, regs->ret);
 
 	}
diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c
index e9e803a4d44c..1f55d5c2628d 100644
--- a/arch/x86/kernel/vm86_32.c
+++ b/arch/x86/kernel/vm86_32.c
@@ -246,9 +246,8 @@ static long do_sys_vm86(struct vm86plus_struct __user *user_vm86, bool plus)
 
 	/* VM86_SCREEN_BITMAP had numerous bugs and appears to have no users. */
 	if (v.flags & VM86_SCREEN_BITMAP) {
-		char comm[TASK_COMM_LEN];
-
-		pr_info_once("vm86: '%s' uses VM86_SCREEN_BITMAP, which is no longer supported\n", get_task_comm(comm, current));
+		pr_info_once("vm86: '%pTN' uses VM86_SCREEN_BITMAP, which is no longer supported\n",
+			     current);
 		return -EINVAL;
 	}
 
-- 
2.43.5