linux-kernel - [PATCH 1 of 6] x86, UV: smp_processor

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-next>] [day] [month] [year] [list]

Message-Id: <E1QWcgn-0004Mv-T6@eag09.americas.sgi.com>
Date:	Tue, 14 Jun 2011 18:06:29 -0500
From:	Cliff Wickman <cpw@....com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu
Subject: [PATCH 1 of 6] x86, UV: smp_processor_id in a preemptable region

From: Cliff Wickman <cpw@....com>

Calling smp_processor_id() from within a preemptable region will issue
a warning if DEBUG_PREEMPT is set.

Diffed against 3.0.0-rc3

Signed-off-by: Cliff Wickman <cpw@....com>
---
 arch/x86/platform/uv/tlb_uv.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux/arch/x86/platform/uv/tlb_uv.c
===================================================================
--- linux.orig/arch/x86/platform/uv/tlb_uv.c
+++ linux/arch/x86/platform/uv/tlb_uv.c
@@ -1334,7 +1334,9 @@ static ssize_t tunables_write(struct fil
 
 	instr[count] = '\0';
 
+	preempt_disable(); /* avoid DEBUG_PREEMPT warning */
 	bcp = &per_cpu(bau_control, smp_processor_id());
+	preempt_enable_no_resched();
 
 	ret = parse_tunables_write(bcp, instr, count);
 	if (ret)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/