16 files changed, 72 insertions, 60 deletions

diff --git a/Makefile b/Makefile
index 546515cd07f3..8e4131bc352e 100644
--- a/Makefile
+++ b/Makefile
@@ -566,6 +566,16 @@ else
 KBUILD_CFLAGS   += -O2
 endif
 
+ifdef CONFIG_READABLE_ASM
+# Disable optimizations that make assembler listings hard to read.
+# reorder blocks reorders the control in the function
+# ipa clone creates specialized cloned functions
+# partial inlining inlines only parts of functions
+KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
+                 $(call cc-option,-fno-ipa-cp-clone,) \
+                 $(call cc-option,-fno-partial-inlining)
+endif
+
 include $(srctree)/arch/$(SRCARCH)/Makefile
 
 ifneq ($(CONFIG_FRAME_WARN),0)
diff --git a/arch/x86/ia32/sys_ia32.c b/arch/x86/ia32/sys_ia32.c
index aec2202a596c..edca9c0a79cc 100644
--- a/arch/x86/ia32/sys_ia32.c
+++ b/arch/x86/ia32/sys_ia32.c
@@ -287,11 +287,6 @@ asmlinkage long sys32_sigaction(int sig, struct old_sigaction32 __user *act,
         return ret;
 }
 
-asmlinkage long sys32_alarm(unsigned int seconds)
-{
-        return alarm_setitimer(seconds);
-}
-
 asmlinkage long sys32_waitpid(compat_pid_t pid, unsigned int *stat_addr,
                               int options)
 {
@@ -300,11 +295,6 @@ asmlinkage long sys32_waitpid(compat_pid_t pid, unsigned int *stat_addr,
 
 /* 32-bit timeval and related flotsam.  */
 
-asmlinkage long sys32_sysfs(int option, u32 arg1, u32 arg2)
-{
-        return sys_sysfs(option, arg1, arg2);
-}
-
 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
                                     struct compat_timespec __user *interval)
 {
@@ -375,19 +365,6 @@ asmlinkage long sys32_pwrite(unsigned int fd, const char __user *ubuf,
 }
 
 
-asmlinkage long sys32_personality(unsigned long personality)
-{
-        int ret;
-
-        if (personality(current->personality) == PER_LINUX32 &&
-                personality == PER_LINUX)
-                personality = PER_LINUX32;
-        ret = sys_personality(personality);
-        if (ret == PER_LINUX32)
-                ret = PER_LINUX;
-        return ret;
-}
-
 asmlinkage long sys32_sendfile(int out_fd, int in_fd,
                                compat_off_t __user *offset, s32 count)
 {
diff --git a/arch/x86/include/asm/kdebug.h b/arch/x86/include/asm/kdebug.h
index d73f1571bde7..2c37aadcbc35 100644
--- a/arch/x86/include/asm/kdebug.h
+++ b/arch/x86/include/asm/kdebug.h
@@ -24,7 +24,6 @@ enum die_val {
 extern void printk_address(unsigned long address, int reliable);
 extern void die(const char *, struct pt_regs *,long);
 extern int __must_check __die(const char *, struct pt_regs *, long);
-extern void show_registers(struct pt_regs *regs);
 extern void show_trace(struct task_struct *t, struct pt_regs *regs,
                        unsigned long *sp, unsigned long bp);
 extern void __show_regs(struct pt_regs *regs, int all);
diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm/spinlock.h
index 76bfa2cf301d..b315a33867f2 100644
--- a/arch/x86/include/asm/spinlock.h
+++ b/arch/x86/include/asm/spinlock.h
@@ -20,10 +20,8 @@
 
 #ifdef CONFIG_X86_32
 # define LOCK_PTR_REG "a"
-# define REG_PTR_MODE "k"
 #else
 # define LOCK_PTR_REG "D"
-# define REG_PTR_MODE "q"
 #endif
 
 #if defined(CONFIG_X86_32) && \
diff --git a/arch/x86/kernel/check.c b/arch/x86/kernel/check.c
index 5da1269e8ddc..e2dbcb7dabdd 100644
--- a/arch/x86/kernel/check.c
+++ b/arch/x86/kernel/check.c
@@ -27,21 +27,29 @@ static int num_scan_areas;
 
 static __init int set_corruption_check(char *arg)
 {
-        char *end;
+        ssize_t ret;
+        unsigned long val;
 
-        memory_corruption_check = simple_strtol(arg, &end, 10);
+        ret = kstrtoul(arg, 10, &val);
+        if (ret)
+                return ret;
 
-        return (*end == 0) ? 0 : -EINVAL;
+        memory_corruption_check = val;
+        return 0;
 }
 early_param("memory_corruption_check", set_corruption_check);
 
 static __init int set_corruption_check_period(char *arg)
 {
-        char *end;
+        ssize_t ret;
+        unsigned long val;
 
-        corruption_check_period = simple_strtoul(arg, &end, 10);
+        ret = kstrtoul(arg, 10, &val);
+        if (ret)
+                return ret;
 
-        return (*end == 0) ? 0 : -EINVAL;
+        corruption_check_period = val;
+        return 0;
 }
 early_param("memory_corruption_check_period", set_corruption_check_period);
 
diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c
index b8f3653dddbc..9a7c90d80bc4 100644
--- a/arch/x86/kernel/cpu/intel_cacheinfo.c
+++ b/arch/x86/kernel/cpu/intel_cacheinfo.c
@@ -615,14 +615,14 @@ unsigned int __cpuinit init_intel_cacheinfo(struct cpuinfo_x86 *c)
                                         new_l2 = this_leaf.size/1024;
                                         num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
                                         index_msb = get_count_order(num_threads_sharing);
-                                        l2_id = c->apicid >> index_msb;
+                                        l2_id = c->apicid & ~((1 << index_msb) - 1);
                                         break;
                                 case 3:
                                         new_l3 = this_leaf.size/1024;
                                         num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
                                         index_msb = get_count_order(
                                                         num_threads_sharing);
-                                        l3_id = c->apicid >> index_msb;
+                                        l3_id = c->apicid & ~((1 << index_msb) - 1);
                                         break;
                                 default:
                                         break;
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 1b81839b6c88..571246d81edf 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -271,7 +271,7 @@ int __kprobes __die(const char *str, struct pt_regs *regs, long err)
                         current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP)
                 return 1;
 
-        show_registers(regs);
+        show_regs(regs);
 #ifdef CONFIG_X86_32
         if (user_mode_vm(regs)) {
                 sp = regs->sp;
@@ -311,16 +311,33 @@ void die(const char *str, struct pt_regs *regs, long err)
 
 static int __init kstack_setup(char *s)
 {
+        ssize_t ret;
+        unsigned long val;
+
         if (!s)
                 return -EINVAL;
-        kstack_depth_to_print = simple_strtoul(s, NULL, 0);
+
+        ret = kstrtoul(s, 0, &val);
+        if (ret)
+                return ret;
+        kstack_depth_to_print = val;
         return 0;
 }
 early_param("kstack", kstack_setup);
 
 static int __init code_bytes_setup(char *s)
 {
-        code_bytes = simple_strtoul(s, NULL, 0);
+        ssize_t ret;
+        unsigned long val;
+
+        if (!s)
+                return -EINVAL;
+
+        ret = kstrtoul(s, 0, &val);
+        if (ret)
+                return ret;
+
+        code_bytes = val;
         if (code_bytes > 8192)
                 code_bytes = 8192;
 
diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c
index 88ec9129271d..e0b1d783daab 100644
--- a/arch/x86/kernel/dumpstack_32.c
+++ b/arch/x86/kernel/dumpstack_32.c
@@ -82,7 +82,7 @@ show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
 }
 
 
-void show_registers(struct pt_regs *regs)
+void show_regs(struct pt_regs *regs)
 {
         int i;
 
diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index 17107bd6e1f0..791b76122aa8 100644
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -245,7 +245,7 @@ show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
         show_trace_log_lvl(task, regs, sp, bp, log_lvl);
 }
 
-void show_registers(struct pt_regs *regs)
+void show_regs(struct pt_regs *regs)
 {
         int i;
         unsigned long sp;
diff --git a/arch/x86/kernel/kprobes.c b/arch/x86/kernel/kprobes.c
index e213fc8408d2..e2f751efb7b1 100644
--- a/arch/x86/kernel/kprobes.c
+++ b/arch/x86/kernel/kprobes.c
@@ -1037,9 +1037,9 @@ int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
                                "current sp %p does not match saved sp %p\n",
                                stack_addr(regs), kcb->jprobe_saved_sp);
                         printk(KERN_ERR "Saved registers for jprobe %p\n", jp);
-                        show_registers(saved_regs);
+                        show_regs(saved_regs);
                         printk(KERN_ERR "Current registers\n");
-                        show_registers(regs);
+                        show_regs(regs);
                         BUG();
                 }
                 *regs = kcb->jprobe_saved_regs;
diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c
index c9bda6d6035c..fbdfc6917180 100644
--- a/arch/x86/kernel/microcode_core.c
+++ b/arch/x86/kernel/microcode_core.c
@@ -299,12 +299,11 @@ static ssize_t reload_store(struct device *dev,
 {
         unsigned long val;
         int cpu = dev->id;
-        int ret = 0;
-        char *end;
+        ssize_t ret = 0;
 
-        val = simple_strtoul(buf, &end, 0);
-        if (end == buf)
-                return -EINVAL;
+        ret = kstrtoul(buf, 0, &val);
+        if (ret)
+                return ret;
 
         if (val == 1) {
                 get_online_cpus();
diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c
index a1faed5ac6a2..bffdfd48c1f2 100644
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -209,7 +209,7 @@ io_check_error(unsigned char reason, struct pt_regs *regs)
         pr_emerg(
         "NMI: IOCK error (debug interrupt?) for reason %02x on CPU %d.\n",
                  reason, smp_processor_id());
-        show_registers(regs);
+        show_regs(regs);
 
         if (panic_on_io_nmi)
                 panic("NMI IOCK error: Not continuing");
diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index d0b2fb9ccbb1..b72838bae64a 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -1480,8 +1480,9 @@ cleanup:
 static int __init calgary_parse_options(char *p)
 {
         unsigned int bridge;
+        unsigned long val;
         size_t len;
-        char* endp;
+        ssize_t ret;
 
         while (*p) {
                 if (!strncmp(p, "64k", 3))
@@ -1512,10 +1513,11 @@ static int __init calgary_parse_options(char *p)
                                 ++p;
                         if (*p == '\0')
                                 break;
-                        bridge = simple_strtoul(p, &endp, 0);
-                        if (p == endp)
+                        ret = kstrtoul(p, 0, &val);
+                        if (ret)
                                 break;
 
+                        bridge = val;
                         if (bridge < MAX_PHB_BUS_NUM) {
                                 printk(KERN_INFO "Calgary: disabling "
                                        "translation for PHB %#x\n", bridge);
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 8040b752ee4f..f2e8c0f951d6 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -113,12 +113,6 @@ void exit_thread(void)
         }
 }
 
-void show_regs(struct pt_regs *regs)
-{
-        show_registers(regs);
-        show_trace(NULL, regs, (unsigned long *)kernel_stack_pointer(regs), 0);
-}
-
 void show_regs_common(void)
 {
         const char *vendor, *product, *board;
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 7e67c5a71061..9b4204e06665 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -393,10 +393,9 @@ static void __init reserve_initrd(void)
         initrd_start = 0;
 
         if (ramdisk_size >= (end_of_lowmem>>1)) {
-                memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
-                printk(KERN_ERR "initrd too large to handle, "
-                       "disabling initrd\n");
-                return;
+                panic("initrd too large to handle, "
+                       "disabling initrd (%lld needed, %lld available)\n",
+                       ramdisk_size, end_of_lowmem>>1);
         }
 
         printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index e11934177030..a42d3ae39648 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -74,6 +74,15 @@ config STRIP_ASM_SYMS
           that look like '.Lxxx') so they don't pollute the output of
           get_wchan() and suchlike.
 
+config READABLE_ASM
+        bool "Generate readable assembler code"
+        depends on DEBUG_KERNEL
+        help
+          Disable some compiler optimizations that tend to generate human unreadable
+          assembler output. This may make the kernel slightly slower, but it helps
+          to keep kernel developers who have to stare a lot at assembler listings
+          sane.
+
 config UNUSED_SYMBOLS
         bool "Enable unused/obsolete exported symbols"
         default y if X86