linux-kernel - [PATCH] ix86: don't waste fixmap entries

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Message-Id: <51A60F1F02000078000D997C@nat28.tlf.novell.com>
Date:	Wed, 29 May 2013 13:22:23 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	"Marcelo Tosatti" <mtosatti@...hat.com>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH] ix86: don't waste fixmap entries

The vsyscall related pvclock entries can only ever be used on x86-64,
and hence they shouldn't even get allocated for 32-bit kernels (the
more that it is there where address space is relatively precious).

Signed-off-by: Jan Beulich <jbeulich@...e.com>
Cc: Marcelo Tosatti <mtosatti@...hat.com>

---
 arch/x86/include/asm/fixmap.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 3.10-rc3/arch/x86/include/asm/fixmap.h
+++ 3.10-rc3-ix86-fixmap-no-pvclock/arch/x86/include/asm/fixmap.h
@@ -81,11 +81,11 @@ enum fixed_addresses {
 			    + ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1,
 	VVAR_PAGE,
 	VSYSCALL_HPET,
-#endif
 #ifdef CONFIG_PARAVIRT_CLOCK
 	PVCLOCK_FIXMAP_BEGIN,
 	PVCLOCK_FIXMAP_END = PVCLOCK_FIXMAP_BEGIN+PVCLOCK_VSYSCALL_NR_PAGES-1,
 #endif
+#endif
 	FIX_DBGP_BASE,
 	FIX_EARLYCON_MEM_BASE,
 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT



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