mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
From: Dave Hansen <dave.hansen@linux.intel.com>
To: linux-kernel@vger.kernel.org
Cc: x86@kernel.org,tglx@linutronix.de,bp@alien8.de,rafael@kernel.org,lenb@kernel.org,dave.jiang@intel.com,irenic.rajneesh@gmail.com,david.e.box@intel.com,Dave
	Hansen <dave.hansen@linux.intel.com>
Subject: [PATCH 10/11] x86/fpu: Remove unnecessary CPUID level check
Date: Wed, 20 Nov 2024 11:53:40 -0800	[thread overview]
Message-ID: <20241120195340.047C9ABE@davehans-spike.ostc.intel.com> (raw)
In-Reply-To: <20241120195327.26E06A69@davehans-spike.ostc.intel.com>


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

The CPUID level dependency table will entirely zap X86_FEATURE_XSAVE
if the CPUID level is too low.  This code is unreachable.  Kill it.

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

 b/arch/x86/kernel/fpu/xstate.c |    5 -----
 1 file changed, 5 deletions(-)

diff -puN arch/x86/kernel/fpu/xstate.c~xsave-leaf-checks-2 arch/x86/kernel/fpu/xstate.c
--- a/arch/x86/kernel/fpu/xstate.c~xsave-leaf-checks-2	2024-11-20 11:44:20.369771244 -0800
+++ b/arch/x86/kernel/fpu/xstate.c	2024-11-20 11:44:20.373771397 -0800
@@ -764,11 +764,6 @@ void __init fpu__init_system_xstate(unsi
 		return;
 	}
 
-	if (boot_cpu_data.cpuid_level < XSTATE_CPUID) {
-		WARN_ON_FPU(1);
-		return;
-	}
-
 	/*
 	 * Find user xstates supported by the processor.
 	 */
_

  parent reply	other threads:[~2024-11-20 19:53 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-11-20 19:53 [PATCH 00/11] x86/cpu: Centralize and standardize CPUID leaf naming Dave Hansen
2024-11-20 19:53 ` [PATCH 01/11] x86/cpu: Move MWAIT leaf definition to common header Dave Hansen
2024-11-26  3:20   ` Zhao Liu
2024-11-20 19:53 ` [PATCH 02/11] x86/cpu: Use MWAIT leaf definition Dave Hansen
2024-11-26  3:24   ` Zhao Liu
2024-11-20 19:53 ` [PATCH 03/11] x86/cpu: Remove unnecessary MwAIT leaf checks Dave Hansen
2024-11-20 19:53 ` [PATCH 04/11] x86/acpi: Check MWAIT feature instead of CPUID level Dave Hansen
2024-11-21 15:33   ` Sean Christopherson
2024-11-21 21:46     ` Dave Hansen
2024-11-20 19:53 ` [PATCH 05/11] x86/cpu: Refresh DCA leaf reading code Dave Hansen
2024-11-26  4:11   ` Zhao Liu
2024-11-26  3:55     ` Dave Hansen
2024-11-20 19:53 ` [PATCH 06/11] x86/cpu: Move TSC CPUID leaf definition Dave Hansen
2024-11-26  4:23   ` Zhao Liu
2024-11-20 19:53 ` [PATCH 07/11] x86/tsc: Move away from TSC leaf magic numbers Dave Hansen
2024-11-20 19:53 ` [PATCH 08/11] x86/tsc: Remove CPUID "frequency" " Dave Hansen
2024-11-26  4:37   ` Zhao Liu
2024-11-20 19:53 ` [PATCH 09/11] x86/fpu: Move CPUID leaf definitions to common code Dave Hansen
2024-11-26  4:43   ` Zhao Liu
2024-11-20 19:53 ` Dave Hansen [this message]
2024-11-21 15:45   ` [PATCH 10/11] x86/fpu: Remove unnecessary CPUID level check Sean Christopherson
2024-11-22 17:46     ` Dave Hansen
2024-11-20 19:53 ` [PATCH 11/11] x86/cpu: Make all all CPUID leaf names consistent Dave Hansen
2024-11-20 20:23   ` Dave Jiang
  -- strict thread matches above, loose matches on Subject: below --
2024-10-30 21:33 [PATCH 00/11] x86/cpu: Centralize and standardize CPUID leaf naming Dave Hansen
2024-10-30 21:33 ` [PATCH 10/11] x86/fpu: Remove unnecessary CPUID level check Dave Hansen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20241120195340.047C9ABE@davehans-spike.ostc.intel.com \
    --to=dave.hansen@linux.intel.com \
    --cc=bp@alien8.de \
    --cc=dave.jiang@intel.com \
    --cc=david.e.box@intel.com \
    --cc=irenic.rajneesh@gmail.com \
    --cc=lenb@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=rafael@kernel.org \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox

all inboxes | Powered by JetHome®