linux-kernel - Re: [PATCH 0/2] [GIT PULL] tracing: various bug fixes

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Message-ID: <20090423172138.GR3036@sequoia.sous-sol.org>
Date:	Thu, 23 Apr 2009 10:21:38 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Glauber de Oliveira Costa <gcosta@...hat.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH 0/2] [GIT PULL] tracing: various bug fixes

* Jeremy Fitzhardinge (jeremy@...p.org) wrote:
> OK, the good news is that its not a callee-save calling convention  
> problem, which is what I feared.  But it does sound pretty awkward to  
> fix.  Does __native_flush_tlb_global() have to use  
> raw_local_irq_save/restore?

Vaguely related...makes sense to do native_(read/write)_cr4 since it's
the native tlb flushing implementation, no?

looks ok from inspection, not tested yet...

thanks,
-chris
--

Subject: [PATCH] x86: use native register access for native tlb flushing

currently these are paravirtulaized, doesn't appear any callers rely on
this (no pv_ops backends are using native_tlb and overriding cr3/4
access).

Signed-off-by: Chris Wright <chrisw@...s-sol.org>
---
 arch/x86/include/asm/tlbflush.h |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index 16a5c84..a5ecc9c 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -17,7 +17,7 @@
 
 static inline void __native_flush_tlb(void)
 {
-	write_cr3(read_cr3());
+	native_write_cr3(native_read_cr3());
 }
 
 static inline void __native_flush_tlb_global(void)
@@ -32,11 +32,11 @@ static inline void __native_flush_tlb_global(void)
 	 */
 	raw_local_irq_save(flags);
 
-	cr4 = read_cr4();
+	cr4 = native_read_cr4();
 	/* clear PGE */
-	write_cr4(cr4 & ~X86_CR4_PGE);
+	native_write_cr4(cr4 & ~X86_CR4_PGE);
 	/* write old PGE again and flush TLBs */
-	write_cr4(cr4);
+	native_write_cr4(cr4);
 
 	raw_local_irq_restore(flags);
 }
--
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