[git pull] x86 fixes

H. Peter Anvin
2008-09-08T19:32:56Z

Linus,

Please pull the latest x86-fixes-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git x86-fixes-for-linus

Thanks,

-hpa

------------------>
H. Peter Anvin (1):
x86: prevent binutils from being "smart" and generating NOPLs for us

Jeremy Fitzhardinge (1):
xen: fix 2.6.27-rc5 xen balloon driver warnings

Linus Torvalds (1):
x86: disable static NOPLs on 32 bits

arch/x86/Kconfig.cpu | 13 ++++++++-----
arch/x86/Makefile_32.cpu | 5 +++++
drivers/xen/balloon.c | 2 +-
3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 2c518fb..b225219 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -382,14 +382,17 @@ config X86_OOSTORE
# P6_NOPs are a relatively minor optimization that require a family >=
# 6 processor, except that it is broken on certain VIA chips.
# Furthermore, AMD chips prefer a totally different sequence of NOPs
-# (which work on all CPUs). As a result, disallow these if we're
-# compiling X86_GENERIC but not X86_64 (these NOPs do work on all
-# x86-64 capable chips); the list of processors in the right-hand clause
-# are the cores that benefit from this optimization.
+# (which work on all CPUs). In addition, it looks like Virtual PC
+# does not understand them.
+#
+# As a result, disallow these if we're not compiling for X86_64 (these
+# NOPs do work on all x86-64 capable chips); the list of processors in
+# the right-hand clause are the cores that benefit from this optimization.
#
config X86_P6_NOP
def_bool y
- depends on (X86_64 || !X86_GENERIC) && (M686 || MPENTIUMII || MPENTIUMIII || MPENTIUMM || MCORE2 || MPENTIUM4 || MPSC)
+ depends on X86_64
+ depends on (MCORE2 || MPENTIUM4 || MPSC)

config X86_TSC
def_bool y
diff --git a/arch/x86/Makefile_32.cpu b/arch/x86/Makefile_32.cpu
index e372b58..b72b4f7 100644
--- a/arch/x86/Makefile_32.cpu
+++ b/arch/x86/Makefile_32.cpu
@@ -45,3 +45,8 @@ cflags-$(CONFIG_MGEODEGX1) += -march=pentium-mmx
# cpu entries
cflags-$(CONFIG_X86_GENERIC) += $(call tune,generic,$(call tune,i686))

+# Bug fix for binutils: this option is required in order to keep
+# binutils from generating NOPL instructions against our will.
+ifneq ($(CONFIG_X86_P6_NOP),y)
+cflags-y += $(call cc-option,-Wa$(comma)-mtune=generic32,)
+endif
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index d4427cb..2e15da5 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -60,7 +60,7 @@

#define PAGES2KB(_p) ((_p)<<(PAGE_SHIFT-10))

-#define BALLOON_CLASS_NAME "memory"
+#define BALLOON_CLASS_NAME "xen_memory"

struct balloon_stats {
/* We aim for 'current allocation' == 'target allocation'. */