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34 lines
1.0 KiB
34 lines
1.0 KiB
From: Andrea Arcangeli <andrea@cpushare.com>
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Subject: [PATCH seccomp: make tsc disabling optional
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Patch-mainline: unknown
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References: 191123
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Make the TSC disable purely paranoid feature optional, so by default seccomp
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returns absolutely zerocost.
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Ported from 2.6.19 to 2.6.24-rc7 by Jeff Mahoney.
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Addition of x86-64 by Jan Beulich.
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Signed-off-by: Andrea Arcangeli <andrea@cpushare.com>
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Acked-by: Jeff Mahoney <jeffm@suse.com>
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Automatically created from "patches.fixes/seccomp-disable-tsc-option" by xen-port-patches.py
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--- head-2011-02-17.orig/arch/x86/kernel/process-xen.c 2011-03-03 16:13:18.000000000 +0100
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+++ head-2011-02-17/arch/x86/kernel/process-xen.c 2011-03-03 16:13:29.000000000 +0100
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@@ -142,6 +142,7 @@ static void hard_disable_TSC(void)
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void disable_TSC(void)
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{
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+#ifdef CONFIG_SECCOMP_DISABLE_TSC
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preempt_disable();
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if (!test_and_set_thread_flag(TIF_NOTSC))
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/*
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@@ -150,6 +151,7 @@ void disable_TSC(void)
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*/
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hard_disable_TSC();
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preempt_enable();
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+#endif
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}
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static void hard_enable_TSC(void)
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