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authorLinus Torvalds <torvalds@linux-foundation.org>2014-10-07 08:51:59 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-07 08:51:59 -0400
commit74da38631a874b5a3ffc4ace6f813a975c55130b (patch)
tree5570e7df2288333c4285a9e0f97df928a7da7353 /arch
parentbfe01a5ba2490f299e1d2d5508cbbbadd897bbe9 (diff)
parent3cf6b0151ba584714f6eafb99bc66d7326efeed7 (diff)
downloadlinux-74da38631a874b5a3ffc4ace6f813a975c55130b.tar.gz
Merge tag 'tiny/for-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/josh/linux
Pull "tinification" patches from Josh Triplett. Work on making smaller kernels. * tag 'tiny/for-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/josh/linux: bloat-o-meter: Ignore syscall aliases SyS_ and compat_SyS_ mm: Support compiling out madvise and fadvise x86: Support compiling out human-friendly processor feature names x86: Drop support for /proc files when !CONFIG_PROC_FS x86, boot: Don't compile early_serial_console.c when !CONFIG_EARLY_PRINTK x86, boot: Don't compile aslr.c when !CONFIG_RANDOMIZE_BASE x86, boot: Use the usual -y -n mechanism for objects in vmlinux x86: Add "make tinyconfig" to configure the tiniest possible kernel x86, platform, kconfig: move kvmconfig functionality to a helper
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/Kconfig12
-rw-r--r--arch/x86/Makefile7
-rw-r--r--arch/x86/boot/Makefile7
-rw-r--r--arch/x86/boot/compressed/Makefile17
-rw-r--r--arch/x86/boot/compressed/aslr.c3
-rw-r--r--arch/x86/boot/compressed/early_serial_console.c4
-rw-r--r--arch/x86/boot/cpu.c68
-rw-r--r--arch/x86/configs/tiny.config1
-rw-r--r--arch/x86/include/asm/cpufeature.h7
-rw-r--r--arch/x86/kernel/cpu/Makefile7
-rw-r--r--arch/x86/kernel/cpu/common.c4
11 files changed, 83 insertions, 54 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 36327438caf0..e4b1f431c7ed 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -137,6 +137,7 @@ config X86
select HAVE_ACPI_APEI if ACPI
select HAVE_ACPI_APEI_NMI if ACPI
select ACPI_LEGACY_TABLES_LOOKUP if ACPI
+ select X86_FEATURE_NAMES if PROC_FS
config INSTRUCTION_DECODER
def_bool y
@@ -314,6 +315,17 @@ config SMP
If you don't know what to do here, say N.
+config X86_FEATURE_NAMES
+ bool "Processor feature human-readable names" if EMBEDDED
+ default y
+ ---help---
+ This option compiles in a table of x86 feature bits and corresponding
+ names. This is required to support /proc/cpuinfo and a few kernel
+ messages. You can disable this to save space, at the expense of
+ making those few kernel messages show numeric feature bits instead.
+
+ If in doubt, say Y.
+
config X86_X2APIC
bool "Support x2apic"
depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 60087ca37679..5692d6ac0f18 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -253,12 +253,6 @@ archclean:
$(Q)$(MAKE) $(clean)=arch/x86/tools
$(Q)$(MAKE) $(clean)=arch/x86/purgatory
-PHONY += kvmconfig
-kvmconfig:
- $(if $(wildcard $(objtree)/.config),, $(error You need an existing .config for this target))
- $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config $(srctree)/arch/x86/configs/kvm_guest.config
- $(Q)yes "" | $(MAKE) -f $(srctree)/Makefile oldconfig
-
define archhelp
echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
echo ' install - Install kernel using'
@@ -272,5 +266,4 @@ define archhelp
echo ' bzdisk/fdimage*/isoimage also accept:'
echo ' FDARGS="..." arguments for the booted kernel'
echo ' FDINITRD=file initrd for the booted kernel'
- echo ' kvmconfig - Enable additional options for guest kernel support'
endef
diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile
index dbe8dd2fe247..5b016e2498f3 100644
--- a/arch/x86/boot/Makefile
+++ b/arch/x86/boot/Makefile
@@ -35,19 +35,22 @@ setup-y += video-vesa.o
setup-y += video-bios.o
targets += $(setup-y)
-hostprogs-y := mkcpustr tools/build
+hostprogs-y := tools/build
+hostprogs-$(CONFIG_X86_FEATURE_NAMES) += mkcpustr
HOST_EXTRACFLAGS += -I$(srctree)/tools/include \
-include include/generated/autoconf.h \
-D__EXPORTED_HEADERS__
+ifdef CONFIG_X86_FEATURE_NAMES
$(obj)/cpu.o: $(obj)/cpustr.h
quiet_cmd_cpustr = CPUSTR $@
cmd_cpustr = $(obj)/mkcpustr > $@
-targets += cpustr.h
+targets += cpustr.h
$(obj)/cpustr.h: $(obj)/mkcpustr FORCE
$(call if_changed,cpustr)
+endif
# ---------------------------------------------------------------------------
diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index 0fcd9133790c..704f58aa79cd 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -26,17 +26,18 @@ LDFLAGS_vmlinux := -T
hostprogs-y := mkpiggy
HOST_EXTRACFLAGS += -I$(srctree)/tools/include
-VMLINUX_OBJS = $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o \
- $(obj)/string.o $(obj)/cmdline.o $(obj)/early_serial_console.o \
- $(obj)/piggy.o $(obj)/cpuflags.o $(obj)/aslr.o
+vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o \
+ $(obj)/string.o $(obj)/cmdline.o \
+ $(obj)/piggy.o $(obj)/cpuflags.o
+
+vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o
+vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/aslr.o
$(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone
-ifeq ($(CONFIG_EFI_STUB), y)
- VMLINUX_OBJS += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o
-endif
+vmlinux-objs-$(CONFIG_EFI_STUB) += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o
-$(obj)/vmlinux: $(VMLINUX_OBJS) FORCE
+$(obj)/vmlinux: $(vmlinux-objs-y) FORCE
$(call if_changed,ld)
@:
@@ -44,7 +45,7 @@ OBJCOPYFLAGS_vmlinux.bin := -R .comment -S
$(obj)/vmlinux.bin: vmlinux FORCE
$(call if_changed,objcopy)
-targets += $(patsubst $(obj)/%,%,$(VMLINUX_OBJS)) vmlinux.bin.all vmlinux.relocs
+targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs
CMD_RELOCS = arch/x86/tools/relocs
quiet_cmd_relocs = RELOCS $@
diff --git a/arch/x86/boot/compressed/aslr.c b/arch/x86/boot/compressed/aslr.c
index d39189ba7f8e..7c68808edeb7 100644
--- a/arch/x86/boot/compressed/aslr.c
+++ b/arch/x86/boot/compressed/aslr.c
@@ -1,6 +1,5 @@
#include "misc.h"
-#ifdef CONFIG_RANDOMIZE_BASE
#include <asm/msr.h>
#include <asm/archrandom.h>
#include <asm/e820.h>
@@ -335,5 +334,3 @@ unsigned char *choose_kernel_location(unsigned char *input,
out:
return (unsigned char *)choice;
}
-
-#endif /* CONFIG_RANDOMIZE_BASE */
diff --git a/arch/x86/boot/compressed/early_serial_console.c b/arch/x86/boot/compressed/early_serial_console.c
index d3d003cb5481..261e81fb9582 100644
--- a/arch/x86/boot/compressed/early_serial_console.c
+++ b/arch/x86/boot/compressed/early_serial_console.c
@@ -1,9 +1,5 @@
#include "misc.h"
-#ifdef CONFIG_EARLY_PRINTK
-
int early_serial_base;
#include "../early_serial_console.c"
-
-#endif
diff --git a/arch/x86/boot/cpu.c b/arch/x86/boot/cpu.c
index 6ec6bb6e9957..29207f69ae8c 100644
--- a/arch/x86/boot/cpu.c
+++ b/arch/x86/boot/cpu.c
@@ -16,7 +16,9 @@
*/
#include "boot.h"
+#ifdef CONFIG_X86_FEATURE_NAMES
#include "cpustr.h"
+#endif
static char *cpu_name(int level)
{
@@ -32,11 +34,48 @@ static char *cpu_name(int level)
}
}
+static void show_cap_strs(u32 *err_flags)
+{
+ int i, j;
+#ifdef CONFIG_X86_FEATURE_NAMES
+ const unsigned char *msg_strs = (const unsigned char *)x86_cap_strs;
+ for (i = 0; i < NCAPINTS; i++) {
+ u32 e = err_flags[i];
+ for (j = 0; j < 32; j++) {
+ if (msg_strs[0] < i ||
+ (msg_strs[0] == i && msg_strs[1] < j)) {
+ /* Skip to the next string */
+ msg_strs += 2;
+ while (*msg_strs++)
+ ;
+ }
+ if (e & 1) {
+ if (msg_strs[0] == i &&
+ msg_strs[1] == j &&
+ msg_strs[2])
+ printf("%s ", msg_strs+2);
+ else
+ printf("%d:%d ", i, j);
+ }
+ e >>= 1;
+ }
+ }
+#else
+ for (i = 0; i < NCAPINTS; i++) {
+ u32 e = err_flags[i];
+ for (j = 0; j < 32; j++) {
+ if (e & 1)
+ printf("%d:%d ", i, j);
+ e >>= 1;
+ }
+ }
+#endif
+}
+
int validate_cpu(void)
{
u32 *err_flags;
int cpu_level, req_level;
- const unsigned char *msg_strs;
check_cpu(&cpu_level, &req_level, &err_flags);
@@ -49,34 +88,9 @@ int validate_cpu(void)
}
if (err_flags) {
- int i, j;
puts("This kernel requires the following features "
"not present on the CPU:\n");
-
- msg_strs = (const unsigned char *)x86_cap_strs;
-
- for (i = 0; i < NCAPINTS; i++) {
- u32 e = err_flags[i];
-
- for (j = 0; j < 32; j++) {
- if (msg_strs[0] < i ||
- (msg_strs[0] == i && msg_strs[1] < j)) {
- /* Skip to the next string */
- msg_strs += 2;
- while (*msg_strs++)
- ;
- }
- if (e & 1) {
- if (msg_strs[0] == i &&
- msg_strs[1] == j &&
- msg_strs[2])
- printf("%s ", msg_strs+2);
- else
- printf("%d:%d ", i, j);
- }
- e >>= 1;
- }
- }
+ show_cap_strs(err_flags);
putchar('\n');
return -1;
} else {
diff --git a/arch/x86/configs/tiny.config b/arch/x86/configs/tiny.config
new file mode 100644
index 000000000000..4e2ecfa23c15
--- /dev/null
+++ b/arch/x86/configs/tiny.config
@@ -0,0 +1 @@
+CONFIG_NOHIGHMEM=y
diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index bb9b258d60e7..516903b98e06 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -250,8 +250,15 @@
#include <asm/asm.h>
#include <linux/bitops.h>
+#ifdef CONFIG_X86_FEATURE_NAMES
extern const char * const x86_cap_flags[NCAPINTS*32];
extern const char * const x86_power_flags[32];
+#define X86_CAP_FMT "%s"
+#define x86_cap_flag(flag) x86_cap_flags[flag]
+#else
+#define X86_CAP_FMT "%d:%d"
+#define x86_cap_flag(flag) ((flag) >> 5), ((flag) & 31)
+#endif
/*
* In order to save room, we index into this array by doing
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index 7fd54f09b011..77dcab277710 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -13,10 +13,13 @@ nostackp := $(call cc-option, -fno-stack-protector)
CFLAGS_common.o := $(nostackp)
obj-y := intel_cacheinfo.o scattered.o topology.o
-obj-y += proc.o capflags.o powerflags.o common.o
+obj-y += common.o
obj-y += rdrand.o
obj-y += match.o
+obj-$(CONFIG_PROC_FS) += proc.o
+obj-$(CONFIG_X86_FEATURE_NAMES) += capflags.o powerflags.o
+
obj-$(CONFIG_X86_32) += bugs.o
obj-$(CONFIG_X86_64) += bugs_64.o
@@ -48,6 +51,7 @@ obj-$(CONFIG_X86_LOCAL_APIC) += perfctr-watchdog.o perf_event_amd_ibs.o
obj-$(CONFIG_HYPERVISOR_GUEST) += vmware.o hypervisor.o mshyperv.o
+ifdef CONFIG_X86_FEATURE_NAMES
quiet_cmd_mkcapflags = MKCAP $@
cmd_mkcapflags = $(CONFIG_SHELL) $(srctree)/$(src)/mkcapflags.sh $< $@
@@ -56,3 +60,4 @@ cpufeature = $(src)/../../include/asm/cpufeature.h
targets += capflags.c
$(obj)/capflags.c: $(cpufeature) $(src)/mkcapflags.sh FORCE
$(call if_changed,mkcapflags)
+endif
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index e4ab2b42bd6f..c649f236e288 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -346,8 +346,8 @@ static void filter_cpuid_features(struct cpuinfo_x86 *c, bool warn)
continue;
printk(KERN_WARNING
- "CPU: CPU feature %s disabled, no CPUID level 0x%x\n",
- x86_cap_flags[df->feature], df->level);
+ "CPU: CPU feature " X86_CAP_FMT " disabled, no CPUID level 0x%x\n",
+ x86_cap_flag(df->feature), df->level);
}
}