linux-kernel - [PATCH] x86/cpu: Use TLS_SIZE instead of open coding it

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20240719032437.35258-1-yuntao.wang@linux.dev>
Date: Fri, 19 Jul 2024 11:24:37 +0800
From: Yuntao Wang <yuntao.wang@...ux.dev>
To: linux-kernel@...r.kernel.org,
	x86@...nel.org
Cc: 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>,
	Xin Li <xin3.li@...el.com>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Vegard Nossum <vegard.nossum@...cle.com>,
	Tony Luck <tony.luck@...el.com>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
	Rick Edgecombe <rick.p.edgecombe@...el.com>,
	Yuntao Wang <yuntao.wang@...ux.dev>
Subject: [PATCH] x86/cpu: Use TLS_SIZE instead of open coding it

Currently, there is already a macro named TLS_SIZE defined in segment.h,
which is equivalent to 'GDT_ENTRY_TLS_ENTRIES * 8'. Therefore, we can use
this macro directly in cpu_init() instead of open coding it.

Signed-off-by: Yuntao Wang <yuntao.wang@...ux.dev>
---
 arch/x86/include/asm/segment.h | 2 +-
 arch/x86/kernel/cpu/common.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/segment.h b/arch/x86/include/asm/segment.h
index 9d6411c65920..c6d710340c02 100644
--- a/arch/x86/include/asm/segment.h
+++ b/arch/x86/include/asm/segment.h
@@ -227,7 +227,7 @@
 
 #define GDT_SIZE			(GDT_ENTRIES*8)
 #define GDT_ENTRY_TLS_ENTRIES		3
-#define TLS_SIZE			(GDT_ENTRY_TLS_ENTRIES* 8)
+#define TLS_SIZE			(GDT_ENTRY_TLS_ENTRIES*8)
 
 /* Bit size and mask of CPU number stored in the per CPU data (and TSC_AUX) */
 #define VDSO_CPUNODE_BITS		12
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index d4e539d4e158..08b58de86c45 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -2220,7 +2220,7 @@ void cpu_init(void)
 
 	if (IS_ENABLED(CONFIG_X86_64)) {
 		loadsegment(fs, 0);
-		memset(cur->thread.tls_array, 0, GDT_ENTRY_TLS_ENTRIES * 8);
+		memset(cur->thread.tls_array, 0, TLS_SIZE);
 		syscall_init();
 
 		wrmsrl(MSR_FS_BASE, 0);
-- 
2.45.2