Merge bk://linux-sam.bkbits.net/kconfig

into mars.ravnborg.org:/home/sam/bk/kconfig

Makefile

@@ -149,14 +149,13 @@ space      := $(nullstring) # end of line
 # careful not to include files twice if building in the source
 # directory. LOCALVERSION from the command line override all of this
 
-ifeq ($(objtree),$(srctree))
-localversion-files := $(wildcard $(srctree)/localversion*)
-else
-localversion-files := $(wildcard $(objtree)/localversion* $(srctree)/localversion*)
-endif
+localver := $(objtree)/localversion* $(srctree)/localversion*
+localver := $(sort $(wildcard $(localver)))
+# skip backup files (containing '~')
+localver := $(foreach f, $(localver), $(if $(findstring ~, $(f)),,$(f)))
 
 LOCALVERSION = $(subst $(space),, \
-	       $(shell cat /dev/null $(localversion-files:%~=)) \
+	       $(shell cat /dev/null $(localver)) \
 	       $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 
 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)$(LOCALVERSION)
@@ -291,7 +290,7 @@ check_gcc = $(warning check_gcc is deprecated - use cc-option) \
             $(call cc-option, $(1),$(2))
 
 # cc-option-yn
-# Usage: flag := $(call gcc-option-yn, -march=winchip-c6)
+# Usage: flag := $(call cc-option-yn, -march=winchip-c6)
 cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
                 > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
 
@@ -331,7 +330,10 @@ DEPMOD		= /sbin/depmod
 KALLSYMS	= scripts/kallsyms
 PERL		= perl
 CHECK		= sparse
+
+NOSTDINC_FLAGS := -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__
+CHECKFLAGS     += $(NOSTDINC_FLAGS)
 MODFLAGS	= -DMODULE
 CFLAGS_MODULE   = $(MODFLAGS)
 AFLAGS_MODULE   = $(MODFLAGS)
@@ -339,7 +341,6 @@ LDFLAGS_MODULE  = -r
 CFLAGS_KERNEL	=
 AFLAGS_KERNEL	=
 
-NOSTDINC_FLAGS  = -nostdinc -iwithprefix include
 
 # Use LINUXINCLUDE when you must reference the include/ directory.
 # Needed to be compatible with the O= option
@@ -389,7 +390,7 @@ scripts_basic:
 # using a seperate output directory. This allows convinient use
 # of make in output directory
 outputmakefile:
-	$(Q)if /usr/bin/env test ! $(srctree) -ef $(objtree); then \
+	$(Q)if test ! $(srctree) -ef $(objtree); then \
 	$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile              \
 	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)         \
 	    > $(objtree)/Makefile;                                 \
@@ -1210,6 +1211,9 @@ checkstack:
 	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
 	$(PERL) $(src)/scripts/checkstack.pl $(ARCH)
 
+kernelrelease:
+	@echo $(KERNELRELEASE)
+
 # FIXME Should go into a make.lib or something 
 # ===========================================================================
 

arch/x86_64/mm/init.c

@@ -614,3 +614,13 @@ int in_gate_area(struct task_struct *task, unsigned long addr)
 	struct vm_area_struct *vma = get_gate_vma(task);
 	return (addr >= vma->vm_start) && (addr < vma->vm_end);
 }
+
+/* Use this when you have no reliable task/vma, typically from interrupt
+ * context.  It is less reliable than using the task's vma and may give
+ * false positives.
+ */
+int in_gate_area_no_task(unsigned long addr)
+{
+	return ((addr >= VSYSCALL_START) && (addr < VSYSCALL_END) ||
+		(addr >= VSYSCALL32_BASE) && (addr < VSYSCALL32_END));
+}

include/asm-x86_64/page.h

@@ -134,13 +134,7 @@ extern __inline__ int get_order(unsigned long size)
 	(((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
 	 VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 
-#define CONFIG_ARCH_GATE_AREA 1	
-
-#ifndef __ASSEMBLY__
-struct task_struct;
-struct vm_area_struct *get_gate_vma(struct task_struct *tsk);
-int in_gate_area(struct task_struct *task, unsigned long addr);
-#endif
+#define __HAVE_ARCH_GATE_AREA 1	
 
 #endif /* __KERNEL__ */
 

include/linux/mm.h

@@ -813,10 +813,14 @@ kernel_map_pages(struct page *page, int numpages, int enable)
 }
 #endif
 
-#ifndef CONFIG_ARCH_GATE_AREA
 extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk);
+#ifdef	__HAVE_ARCH_GATE_AREA
+int in_gate_area_no_task(unsigned long addr);
 int in_gate_area(struct task_struct *task, unsigned long addr);
-#endif
+#else
+int in_gate_area_no_task(unsigned long addr);
+#define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);})
+#endif	/* __HAVE_ARCH_GATE_AREA */
 
 #endif /* __KERNEL__ */
 #endif /* _LINUX_MM_H */

kernel/kallsyms.c

@@ -18,6 +18,13 @@
 #include <linux/fs.h>
 #include <linux/err.h>
 #include <linux/proc_fs.h>
+#include <linux/mm.h>
+
+#ifdef CONFIG_KALLSYMS_ALL
+#define all_var 1
+#else
+#define all_var 0
+#endif
 
 /* These will be re-linked against their real values during the second link stage */
 extern unsigned long kallsyms_addresses[] __attribute__((weak));
@@ -30,7 +37,7 @@ extern u16 kallsyms_token_index[] __attribute__((weak));
 extern unsigned long kallsyms_markers[] __attribute__((weak));
 
 /* Defined by the linker script. */
-extern char _stext[], _etext[], _sinittext[], _einittext[];
+extern char _stext[], _etext[], _sinittext[], _einittext[], _end[];
 
 static inline int is_kernel_inittext(unsigned long addr)
 {
@@ -44,7 +51,7 @@ static inline int is_kernel_text(unsigned long addr)
 {
 	if (addr >= (unsigned long)_stext && addr <= (unsigned long)_etext)
 		return 1;
-	return 0;
+	return in_gate_area_no_task(addr);
 }
 
 /* expand a compressed symbol data into the resulting uncompressed string,
@@ -147,7 +154,7 @@ const char *kallsyms_lookup(unsigned long addr,
 	namebuf[KSYM_NAME_LEN] = 0;
 	namebuf[0] = 0;
 
-	if (is_kernel_text(addr) || is_kernel_inittext(addr)) {
+	if (all_var || is_kernel_text(addr) || is_kernel_inittext(addr)) {
 		unsigned long symbol_end=0;
 
 		/* do a binary search on the sorted kallsyms_addresses array */
@@ -181,7 +188,7 @@ const char *kallsyms_lookup(unsigned long addr,
 			if (is_kernel_inittext(addr))
 				symbol_end = (unsigned long)_einittext;
 			else
-				symbol_end = (unsigned long)_etext;
+				symbol_end = all_var ? (unsigned long)_end : (unsigned long)_etext;
 		}
 
 		*symbolsize = symbol_end - kallsyms_addresses[low];

mm/memory.c

@@ -2094,7 +2094,7 @@ unsigned long vmalloc_to_pfn(void * vmalloc_addr)
 
 EXPORT_SYMBOL(vmalloc_to_pfn);
 
-#if !defined(CONFIG_ARCH_GATE_AREA)
+#if !defined(__HAVE_ARCH_GATE_AREA)
 
 #if defined(AT_SYSINFO_EHDR)
 struct vm_area_struct gate_vma;
@@ -2120,7 +2120,7 @@ struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
 #endif
 }
 
-int in_gate_area(struct task_struct *task, unsigned long addr)
+int in_gate_area_no_task(unsigned long addr)
 {
 #ifdef AT_SYSINFO_EHDR
 	if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END))
@@ -2129,4 +2129,4 @@ int in_gate_area(struct task_struct *task, unsigned long addr)
 	return 0;
 }
 
-#endif
+#endif	/* __HAVE_ARCH_GATE_AREA */

scripts/Makefile.build

@@ -83,7 +83,6 @@ __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
 
 # Linus' kernel sanity checking tool
 ifneq ($(KBUILD_CHECKSRC),0)
-  CHECKFLAGS += -I$(shell $(CC) -print-file-name=include)
   ifeq ($(KBUILD_CHECKSRC),2)
     quiet_cmd_force_checksrc = CHECK   $<
           cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;

scripts/kallsyms.c

@@ -184,6 +184,15 @@ symbol_valid(struct sym_entry *s)
 		if ((s->addr < _stext || s->addr > _etext)
 		    && (s->addr < _sinittext || s->addr > _einittext))
 			return 0;
+		/* Corner case.  Discard any symbols with the same value as
+		 * _etext or _einittext, they can move between pass 1 and 2
+		 * when the kallsyms data is added.  If these symbols move then
+		 * they may get dropped in pass 2, which breaks the kallsyms
+		 * rules.
+		 */
+		if ((s->addr == _etext && strcmp(s->sym + 1, "_etext")) ||
+		    (s->addr == _einittext && strcmp(s->sym + 1, "_einittext")))
+			return 0;
 	}
 
 	/* Exclude symbols which vary between passes. */