mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
From: Andy Lutomirski <luto@kernel.org>
To: x86@kernel.org
Cc: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
	Borislav Petkov <bp@alien8.de>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Brian Gerst <brgerst@gmail.com>,
	Matthew Whitehead <tedheadster@gmail.com>,
	Andy Lutomirski <luto@kernel.org>
Subject: [RFC PATCH 6/6] x86/fpu: Fix the "Giving up, no FPU found" test
Date: Mon,  5 Dec 2016 17:01:15 -0800	[thread overview]
Message-ID: <9bb4f6c812ae632ae26676ed6862cc1b51d44657.1480985979.git.luto@kernel.org> (raw)
In-Reply-To: <cover.1480985979.git.luto@kernel.org>
In-Reply-To: <cover.1480985979.git.luto@kernel.org>

We would never print "Giving up, no FPU found" because
X86_FEATURE_FPU was in REQUIRED_MASK on non-FPU-emulating builds, so
the boot_cpu_has() test didn't do anything.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
 arch/x86/kernel/fpu/init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/fpu/init.c b/arch/x86/kernel/fpu/init.c
index 75e1bf3b0319..d41924a72576 100644
--- a/arch/x86/kernel/fpu/init.c
+++ b/arch/x86/kernel/fpu/init.c
@@ -80,7 +80,7 @@ static void fpu__init_system_early_generic(struct cpuinfo_x86 *c)
 	}
 
 #ifndef CONFIG_MATH_EMULATION
-	if (!boot_cpu_has(X86_FEATURE_FPU)) {
+	if (!test_cpu_cap(&boot_cpu_data, X86_FEATURE_FPU)) {
 		pr_emerg("x86/fpu: Giving up, no FPU found and no math emulation present\n");
 		for (;;)
 			asm volatile("hlt");
-- 
2.9.3

      parent reply	other threads:[~2016-12-06  1:02 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-06  1:01 [RFC PATCH 0/6] CPUID and FPU fixes Andy Lutomirski
2016-12-06  1:01 ` [RFC PATCH 1/6] x86/CPU: Add X86_FEATURE_CPUID Andy Lutomirski
2016-12-06  8:08   ` Borislav Petkov
2016-12-06  1:01 ` [RFC PATCH 2/6] x86/cpu: Factor out application of forced cpu caps Andy Lutomirski
2016-12-06  8:32   ` Borislav Petkov
2016-12-06  1:01 ` [RFC PATCH 3/6] x86/cpu: Re-apply forced caps every time cpu caps are re-read Andy Lutomirski
2016-12-06  8:57   ` Borislav Petkov
2016-12-06  1:01 ` [RFC PATCH 4/6] x86/fpu: Fix "x86/fpu: Legacy x87 FPU detected" message Andy Lutomirski
2016-12-06  9:24   ` Borislav Petkov
2016-12-06 17:59     ` Andy Lutomirski
2016-12-06 18:04       ` Borislav Petkov
2016-12-06  1:01 ` [RFC PATCH 5/6] x86/fpu: Fix CPUID-less FPU detection Andy Lutomirski
2016-12-06  9:40   ` Borislav Petkov
2016-12-06 17:52     ` Andy Lutomirski
2016-12-07  9:42       ` Borislav Petkov
2016-12-06  1:01 ` Andy Lutomirski [this message]

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=9bb4f6c812ae632ae26676ed6862cc1b51d44657.1480985979.git.luto@kernel.org \
    --to=luto@kernel.org \
    --cc=bp@alien8.de \
    --cc=brgerst@gmail.com \
    --cc=gnomes@lxorguk.ukuu.org.uk \
    --cc=linux-kernel@vger.kernel.org \
    --cc=tedheadster@gmail.com \
    --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®