linux-kernel - [RFC][PATCH 20/34] x86/cpu: Remove superfluous cache alignment assignments

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

Message-Id: <20240222183953.97E25EC4@davehans-spike.ostc.intel.com>
Date: Thu, 22 Feb 2024 10:39:53 -0800
From: Dave Hansen <dave.hansen@...ux.intel.com>
To: linux-kernel@...r.kernel.org
Cc: kirill.shutemov@...ux.intel.com,pbonzini@...hat.com,tglx@...utronix.de,x86@...nel.org,bp@...en8.de,Dave Hansen <dave.hansen@...ux.intel.com>
Subject: [RFC][PATCH 20/34] x86/cpu: Remove superfluous cache alignment assignments


From: Dave Hansen <dave.hansen@...ux.intel.com>

Now that the boot CPU's ->x86_cache_alignment is authoritative
and is is consistently established, these other copies only
serve to clobber it needlessly.  Remove them.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
---

 b/arch/x86/kernel/cpu/common.c |    2 --
 1 file changed, 2 deletions(-)

diff -puN arch/x86/kernel/cpu/common.c~dup-cache-alignment arch/x86/kernel/cpu/common.c
--- a/arch/x86/kernel/cpu/common.c~dup-cache-alignment	2024-02-22 10:08:58.260838084 -0800
+++ b/arch/x86/kernel/cpu/common.c	2024-02-22 10:08:58.260838084 -0800
@@ -956,7 +956,6 @@ void cpu_detect(struct cpuinfo_x86 *c)
 		if (cap0 & (1<<19)) {
 			if (c == &boot_cpu_data)
 				c->x86_clflush_size = ((misc >> 8) & 0xff) * 8;
-			c->x86_cache_alignment = x86_clflush_size();
 		}
 	}
 }
@@ -1834,7 +1833,6 @@ static void identify_cpu(struct cpuinfo_
 	c->cpuid_level = -1;	/* CPUID not detected */
 	c->x86_clflush_size = 32;
 #endif
-	c->x86_cache_alignment = x86_clflush_size();
 	memset(&c->x86_capability, 0, sizeof(c->x86_capability));
 #ifdef CONFIG_X86_VMX_FEATURE_NAMES
 	memset(&c->vmx_capability, 0, sizeof(c->vmx_capability));
_