12 files changed, 222 insertions, 29 deletions

diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c
index c9b69167632a..233526ba3abe 100644
--- a/arch/sparc64/kernel/irq.c
+++ b/arch/sparc64/kernel/irq.c
@@ -27,6 +27,7 @@
 #include <asm/atomic.h>
 #include <asm/system.h>
 #include <asm/irq.h>
+#include <asm/io.h>
 #include <asm/sbus.h>
 #include <asm/iommu.h>
 #include <asm/upa.h>
diff --git a/arch/um/Makefile b/arch/um/Makefile
index 7af37e342e33..e1ffad224605 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -152,7 +152,7 @@ archclean:
 $(SYMLINK_HEADERS):
         @echo '  SYMLINK $@'
 ifneq ($(KBUILD_SRC),)
-        ln -fsn $(srctree)/include/asm-um/$(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $@
+        $(Q)ln -fsn $(srctree)/include/asm-um/$(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $@
 else
         $(Q)cd $(TOPDIR)/$(dir $@) ; \
         ln -sf $(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $(notdir $@)
diff --git a/arch/um/drivers/cow.h b/arch/um/drivers/cow.h
index 4fcf3a8d13f4..dc36b222100b 100644
--- a/arch/um/drivers/cow.h
+++ b/arch/um/drivers/cow.h
@@ -3,15 +3,40 @@
 
 #include <asm/types.h>
 
-#if defined(__BIG_ENDIAN)
-# define ntohll(x) (x)
-# define htonll(x) (x)
-#elif defined(__LITTLE_ENDIAN)
-# define ntohll(x)  bswap_64(x)
-# define htonll(x)  bswap_64(x)
+#if defined(__KERNEL__)
+
+# include <asm/byteorder.h>
+
+# if defined(__BIG_ENDIAN)
+#       define ntohll(x) (x)
+#       define htonll(x) (x)
+# elif defined(__LITTLE_ENDIAN)
+#       define ntohll(x)  be64_to_cpu(x)
+#       define htonll(x)  cpu_to_be64(x)
+# else
+#       error "Could not determine byte order"
+# endif
+
 #else
-#error "__BYTE_ORDER not defined"
+/* For the definition of ntohl, htonl and __BYTE_ORDER */
+#include <endian.h>
+#include <netinet/in.h>
+#if defined(__BYTE_ORDER)
+
+#  if __BYTE_ORDER == __BIG_ENDIAN
+#       define ntohll(x) (x)
+#       define htonll(x) (x)
+#  elif __BYTE_ORDER == __LITTLE_ENDIAN
+#       define ntohll(x)  bswap_64(x)
+#       define htonll(x)  bswap_64(x)
+#  else
+#       error "Could not determine byte order: __BYTE_ORDER uncorrectly defined"
+#  endif
+
+#else  /* ! defined(__BYTE_ORDER) */
+#       error "Could not determine byte order: __BYTE_ORDER not defined"
 #endif
+#endif /* ! defined(__KERNEL__) */
 
 extern int init_cow_file(int fd, char *cow_file, char *backing_file,
                          int sectorsize, int alignment, int *bitmap_offset_out,
diff --git a/arch/um/drivers/cow_user.c b/arch/um/drivers/cow_user.c
index a8ce6fc3ef26..fbe2217db5dd 100644
--- a/arch/um/drivers/cow_user.c
+++ b/arch/um/drivers/cow_user.c
@@ -9,7 +9,6 @@
 #include <sys/time.h>
 #include <sys/param.h>
 #include <sys/user.h>
-#include <netinet/in.h>
 
 #include "os.h"
 
diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index 6af83171ca4e..b99ab414542f 100644
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c
@@ -143,11 +143,22 @@ static int __init skas0_cmd_param(char *str, int* add)
         return 0;
 }
 
+/* The two __uml_setup would conflict, without this stupid alias. */
+
+static int __init mode_skas0_cmd_param(char *str, int* add)
+        __attribute__((alias("skas0_cmd_param")));
+
 __uml_setup("skas0", skas0_cmd_param,
                 "skas0\n"
                 "    Disables SKAS3 usage, so that SKAS0 is used, unless \n"
                 "    you specify mode=tt.\n\n");
 
+__uml_setup("mode=skas0", mode_skas0_cmd_param,
+                "mode=skas0\n"
+                "    Disables SKAS3 usage, so that SKAS0 is used, unless you \n"
+                "    specify mode=tt. Note that this was recently added - on \n"
+                "    older kernels you must use simply \"skas0\".\n\n");
+
 static int force_sysemu_disabled = 0;
 
 static int __init nosysemu_cmd_param(char *str, int* add)
diff --git a/arch/um/scripts/Makefile.rules b/arch/um/scripts/Makefile.rules
index 59a1291f477e..651d9d88b656 100644
--- a/arch/um/scripts/Makefile.rules
+++ b/arch/um/scripts/Makefile.rules
@@ -7,8 +7,8 @@ USER_SINGLE_OBJS := \
 USER_OBJS += $(filter %_user.o,$(obj-y) $(obj-m)  $(USER_SINGLE_OBJS))
 USER_OBJS := $(foreach file,$(USER_OBJS),$(obj)/$(file))
 
-$(USER_OBJS) : c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) \
-        $(CFLAGS_$(notdir $@))
+$(USER_OBJS) $(USER_OBJS:.o=.i) $(USER_OBJS:.o=.s) $(USER_OBJS:.o=.lst): \
+        c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) $(CFLAGS_$(notdir $@))
 $(USER_OBJS): cmd_checksrc =
 $(USER_OBJS): quiet_cmd_checksrc =
 $(USER_OBJS): cmd_force_checksrc =
diff --git a/arch/um/sys-x86_64/stub_segv.c b/arch/um/sys-x86_64/stub_segv.c
index 65a131b362b6..d1e53bdf2e85 100644
--- a/arch/um/sys-x86_64/stub_segv.c
+++ b/arch/um/sys-x86_64/stub_segv.c
@@ -10,6 +10,22 @@
 #include "uml-config.h"
 #include "sysdep/sigcontext.h"
 #include "sysdep/faultinfo.h"
+#include <stddef.h>
+
+/* Copied from sys-x86_64/signal.c - Can't find an equivalent definition
+ * in the libc headers anywhere.
+ */
+struct rt_sigframe
+{
+        char *pretcode;
+        struct ucontext uc;
+        struct siginfo info;
+};
+
+/* Copied here from <linux/kernel.h> - we're userspace. */
+#define container_of(ptr, type, member) ({                   \
+        const typeof( ((type *)0)->member ) *__mptr = (ptr); \
+        (type *)( (char *)__mptr - offsetof(type,member) );})
 
 void __attribute__ ((__section__ (".__syscall_stub")))
 stub_segv_handler(int sig)
@@ -17,16 +33,19 @@ stub_segv_handler(int sig)
         struct ucontext *uc;
 
         __asm__("movq %%rdx, %0" : "=g" (uc) :);
-        GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA),
-                              &uc->uc_mcontext);
+        GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA),
+                              &uc->uc_mcontext);
 
-        __asm__("movq %0, %%rax ; syscall": : "g" (__NR_getpid));
+        __asm__("movq %0, %%rax ; syscall": : "g" (__NR_getpid));       
         __asm__("movq %%rax, %%rdi ; movq %0, %%rax ; movq %1, %%rsi ;"
-                "syscall": : "g" (__NR_kill), "g" (SIGUSR1));
-        /* Two popqs to restore the stack to the state just before entering
-         * the handler, one pops the return address, the other pops the frame
-         * pointer.
+                "syscall": : "g" (__NR_kill), "g" (SIGUSR1) : 
+                "%rdi", "%rax", "%rsi");
+        /* sys_sigreturn expects that the stack pointer will be 8 bytes into
+         * the signal frame.  So, we use the ucontext pointer, which we know
+         * already, to get the signal frame pointer, and add 8 to that.
          */
-        __asm__("popq %%rax ; popq %%rax ; movq %0, %%rax ; syscall" : : "g"
-                (__NR_rt_sigreturn));
+        __asm__("movq %0, %%rsp": : 
+                "g" ((unsigned long) container_of(uc, struct rt_sigframe, 
+                                                  uc) + 8));
+        __asm__("movq %0, %%rax ; syscall" : : "g" (__NR_rt_sigreturn));
 }
diff --git a/arch/x86_64/kernel/suspend.c b/arch/x86_64/kernel/suspend.c
index ebb9abf3ce6d..f066c6ab3618 100644
--- a/arch/x86_64/kernel/suspend.c
+++ b/arch/x86_64/kernel/suspend.c
@@ -11,6 +11,8 @@
 #include <linux/smp.h>
 #include <linux/suspend.h>
 #include <asm/proto.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
 
 struct saved_context saved_context;
 
@@ -140,4 +142,129 @@ void fix_processor_context(void)
 
 }
 
+#ifdef CONFIG_SOFTWARE_SUSPEND
+/* Defined in arch/x86_64/kernel/suspend_asm.S */
+extern int restore_image(void);
 
+pgd_t *temp_level4_pgt;
+
+static void **pages;
+
+static inline void *__add_page(void)
+{
+        void **c;
+
+        c = (void **)get_usable_page(GFP_ATOMIC);
+        if (c) {
+                *c = pages;
+                pages = c;
+        }
+        return c;
+}
+
+static inline void *__next_page(void)
+{
+        void **c;
+
+        c = pages;
+        if (c) {
+                pages = *c;
+                *c = NULL;
+        }
+        return c;
+}
+
+/*
+ * Try to allocate as many usable pages as needed and daisy chain them.
+ * If one allocation fails, free the pages allocated so far
+ */
+static int alloc_usable_pages(unsigned long n)
+{
+        void *p;
+
+        pages = NULL;
+        do
+                if (!__add_page())
+                        break;
+        while (--n);
+        if (n) {
+                p = __next_page();
+                while (p) {
+                        free_page((unsigned long)p);
+                        p = __next_page();
+                }
+                return -ENOMEM;
+        }
+        return 0;
+}
+
+static void res_phys_pud_init(pud_t *pud, unsigned long address, unsigned long end)
+{
+        long i, j;
+
+        i = pud_index(address);
+        pud = pud + i;
+        for (; i < PTRS_PER_PUD; pud++, i++) {
+                unsigned long paddr;
+                pmd_t *pmd;
+
+                paddr = address + i*PUD_SIZE;
+                if (paddr >= end)
+                        break;
+
+                pmd = (pmd_t *)__next_page();
+                set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
+                for (j = 0; j < PTRS_PER_PMD; pmd++, j++, paddr += PMD_SIZE) {
+                        unsigned long pe;
+
+                        if (paddr >= end)
+                                break;
+                        pe = _PAGE_NX | _PAGE_PSE | _KERNPG_TABLE | paddr;
+                        pe &= __supported_pte_mask;
+                        set_pmd(pmd, __pmd(pe));
+                }
+        }
+}
+
+static void set_up_temporary_mappings(void)
+{
+        unsigned long start, end, next;
+
+        temp_level4_pgt = (pgd_t *)__next_page();
+
+        /* It is safe to reuse the original kernel mapping */
+        set_pgd(temp_level4_pgt + pgd_index(__START_KERNEL_map),
+                init_level4_pgt[pgd_index(__START_KERNEL_map)]);
+
+        /* Set up the direct mapping from scratch */
+        start = (unsigned long)pfn_to_kaddr(0);
+        end = (unsigned long)pfn_to_kaddr(end_pfn);
+
+        for (; start < end; start = next) {
+                pud_t *pud = (pud_t *)__next_page();
+                next = start + PGDIR_SIZE;
+                if (next > end)
+                        next = end;
+                res_phys_pud_init(pud, __pa(start), __pa(next));
+                set_pgd(temp_level4_pgt + pgd_index(start),
+                        mk_kernel_pgd(__pa(pud)));
+        }
+}
+
+int swsusp_arch_resume(void)
+{
+        unsigned long n;
+
+        n = ((end_pfn << PAGE_SHIFT) + PUD_SIZE - 1) >> PUD_SHIFT;
+        n += (n + PTRS_PER_PUD - 1) / PTRS_PER_PUD + 1;
+        pr_debug("swsusp_arch_resume(): pages needed = %lu\n", n);
+        if (alloc_usable_pages(n)) {
+                free_eaten_memory();
+                return -ENOMEM;
+        }
+        /* We have got enough memory and from now on we cannot recover */
+        set_up_temporary_mappings();
+        restore_image();
+        return 0;
+}
+#endif /* CONFIG_SOFTWARE_SUSPEND */
diff --git a/arch/x86_64/kernel/suspend_asm.S b/arch/x86_64/kernel/suspend_asm.S
index 4d659e97df10..320b6fb00cca 100644
--- a/arch/x86_64/kernel/suspend_asm.S
+++ b/arch/x86_64/kernel/suspend_asm.S
@@ -39,12 +39,13 @@ ENTRY(swsusp_arch_suspend)
         call swsusp_save
         ret
 
-ENTRY(swsusp_arch_resume)
-        /* set up cr3 */        
-        leaq    init_level4_pgt(%rip),%rax
-        subq    $__START_KERNEL_map,%rax
-        movq    %rax,%cr3
-
+ENTRY(restore_image)
+        /* switch to temporary page tables */
+        movq    $__PAGE_OFFSET, %rdx
+        movq    temp_level4_pgt(%rip), %rax
+        subq    %rdx, %rax
+        movq    %rax, %cr3
+        /* Flush TLB */
         movq    mmu_cr4_features(%rip), %rax
         movq    %rax, %rdx
         andq    $~(1<<7), %rdx  # PGE
@@ -69,6 +70,10 @@ loop:
         movq    pbe_next(%rdx), %rdx
         jmp     loop
 done:
+        /* go back to the original page tables */
+        leaq    init_level4_pgt(%rip), %rax
+        subq    $__START_KERNEL_map, %rax
+        movq    %rax, %cr3
         /* Flush TLB, including "global" things (vmalloc) */
         movq    mmu_cr4_features(%rip), %rax
         movq    %rax, %rdx
diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c
index fabd3529cebc..d5e76423a0ee 100644
--- a/drivers/pcmcia/cs.c
+++ b/drivers/pcmcia/cs.c
@@ -689,6 +689,9 @@ static int pccardd(void *__skt)
                 schedule();
                 try_to_freeze();
         }
+        /* make sure we are running before we exit */
+        set_current_state(TASK_RUNNING);
+
         remove_wait_queue(&skt->thread_wait, &wait);
 
         /* remove from the device core */
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index f2e96fdfaae0..ad15a54806d8 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -71,5 +71,7 @@ void restore_processor_state(void);
 struct saved_context;
 void __save_processor_state(struct saved_context *ctxt);
 void __restore_processor_state(struct saved_context *ctxt);
+extern unsigned long get_usable_page(unsigned gfp_mask);
+extern void free_eaten_memory(void);
 
 #endif /* _LINUX_SWSUSP_H */
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index acf79ac1cb6d..2d5c45676442 100644
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -1095,7 +1095,7 @@ static inline void eat_page(void *page)
         *eaten_memory = c;
 }
 
-static unsigned long get_usable_page(unsigned gfp_mask)
+unsigned long get_usable_page(unsigned gfp_mask)
 {
         unsigned long m;
 
@@ -1109,7 +1109,7 @@ static unsigned long get_usable_page(unsigned gfp_mask)
         return m;
 }
 
-static void free_eaten_memory(void)
+void free_eaten_memory(void)
 {
         unsigned long m;
         void **c;
@@ -1481,11 +1481,12 @@ static int read_suspend_image(void)
         /* Allocate memory for the image and read the data from swap */
 
         error = check_pagedir(pagedir_nosave);
-        free_eaten_memory();
+
         if (!error)
                 error = data_read(pagedir_nosave);
 
         if (error) { /* We fail cleanly */
+                free_eaten_memory();
                 for_each_pbe (p, pagedir_nosave)
                         if (p->address) {
                                 free_page(p->address);