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

* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: Don't leak 64-bit kernel register values to 32-bit processes
  x86, SLUB: Remove unused CONFIG FAST_CMPXCHG_LOCAL
  x86: earlyprintk: Fix regression to handle serial,ttySn as 1 arg
  x86: Don't generate cmpxchg8b_emu if CONFIG_X86_CMPXCHG64=y
  x86: Fix csum_ipv6_magic asm memory clobber
  x86: Optimize cmpxchg64() at build-time some more

7 files changed, 36 insertions, 21 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 6fa7292947e5..9107b387e91f 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -671,6 +671,7 @@ and is between 256 and 4096 characters. It is defined in the file
         earlyprintk=    [X86,SH,BLACKFIN]
                         earlyprintk=vga
                         earlyprintk=serial[,ttySn[,baudrate]]
+                        earlyprintk=ttySn[,baudrate]
                         earlyprintk=dbgp[debugController#]
 
                         Append ",keep" to not disable it when the real console
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 8da93745c087..c876bace8fdc 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -86,10 +86,6 @@ config STACKTRACE_SUPPORT
 config HAVE_LATENCYTOP_SUPPORT
         def_bool y
 
-config FAST_CMPXCHG_LOCAL
-        bool
-        default y
-
 config MMU
         def_bool y
 
diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 527519b8a9f9..f2824fb8c79c 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -400,7 +400,7 @@ config X86_TSC
 
 config X86_CMPXCHG64
         def_bool y
-        depends on X86_PAE || X86_64
+        depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM
 
 # this should be set for all -march=.. options where the compiler
 # generates cmov.
@@ -412,6 +412,7 @@ config X86_MINIMUM_CPU_FAMILY
         int
         default "64" if X86_64
         default "6" if X86_32 && X86_P6_NOP
+        default "5" if X86_32 && X86_CMPXCHG64
         default "4" if X86_32 && (X86_XADD || X86_CMPXCHG || X86_BSWAP || X86_WP_WORKS_OK)
         default "3"
 
diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index 74619c4f9fda..1733f9f65e82 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -21,8 +21,8 @@
 #define __AUDIT_ARCH_LE    0x40000000
 
 #ifndef CONFIG_AUDITSYSCALL
-#define sysexit_audit int_ret_from_sys_call
-#define sysretl_audit int_ret_from_sys_call
+#define sysexit_audit ia32_ret_from_sys_call
+#define sysretl_audit ia32_ret_from_sys_call
 #endif
 
 #define IA32_NR_syscalls ((ia32_syscall_end - ia32_sys_call_table)/8)
@@ -39,12 +39,12 @@
         .endm 
 
         /* clobbers %eax */     
-        .macro  CLEAR_RREGS _r9=rax
+        .macro  CLEAR_RREGS offset=0, _r9=rax
         xorl    %eax,%eax
-        movq    %rax,R11(%rsp)
-        movq    %rax,R10(%rsp)
-        movq    %\_r9,R9(%rsp)
-        movq    %rax,R8(%rsp)
+        movq    %rax,\offset+R11(%rsp)
+        movq    %rax,\offset+R10(%rsp)
+        movq    %\_r9,\offset+R9(%rsp)
+        movq    %rax,\offset+R8(%rsp)
         .endm
 
         /*
@@ -172,6 +172,10 @@ sysexit_from_sys_call:
         movl    RIP-R11(%rsp),%edx              /* User %eip */
         CFI_REGISTER rip,rdx
         RESTORE_ARGS 1,24,1,1,1,1
+        xorq    %r8,%r8
+        xorq    %r9,%r9
+        xorq    %r10,%r10
+        xorq    %r11,%r11
         popfq
         CFI_ADJUST_CFA_OFFSET -8
         /*CFI_RESTORE rflags*/
@@ -202,7 +206,7 @@ sysexit_from_sys_call:
 
         .macro auditsys_exit exit,ebpsave=RBP
         testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),TI_flags(%r10)
-        jnz int_ret_from_sys_call
+        jnz ia32_ret_from_sys_call
         TRACE_IRQS_ON
         sti
         movl %eax,%esi          /* second arg, syscall return value */
@@ -218,8 +222,9 @@ sysexit_from_sys_call:
         cli
         TRACE_IRQS_OFF
         testl %edi,TI_flags(%r10)
-        jnz int_with_check
-        jmp \exit
+        jz \exit
+        CLEAR_RREGS -ARGOFFSET
+        jmp int_with_check
         .endm
 
 sysenter_auditsys:
@@ -329,6 +334,9 @@ sysretl_from_sys_call:
         CFI_REGISTER rip,rcx
         movl EFLAGS-ARGOFFSET(%rsp),%r11d       
         /*CFI_REGISTER rflags,r11*/
+        xorq    %r10,%r10
+        xorq    %r9,%r9
+        xorq    %r8,%r8
         TRACE_IRQS_ON
         movl RSP-ARGOFFSET(%rsp),%esp
         CFI_RESTORE rsp
@@ -353,7 +361,7 @@ cstar_tracesys:
 #endif
         xchgl %r9d,%ebp
         SAVE_REST
-        CLEAR_RREGS r9
+        CLEAR_RREGS 0, r9
         movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */
         movq %rsp,%rdi        /* &pt_regs -> arg1 */
         call syscall_trace_enter
@@ -425,6 +433,8 @@ ia32_do_call:
         call *ia32_sys_call_table(,%rax,8) # xxx: rip relative
 ia32_sysret:
         movq %rax,RAX-ARGOFFSET(%rsp)
+ia32_ret_from_sys_call:
+        CLEAR_RREGS -ARGOFFSET
         jmp int_ret_from_sys_call 
 
 ia32_tracesys:                   
@@ -442,8 +452,8 @@ END(ia32_syscall)
 
 ia32_badsys:
         movq $0,ORIG_RAX-ARGOFFSET(%rsp)
-        movq $-ENOSYS,RAX-ARGOFFSET(%rsp)
-        jmp int_ret_from_sys_call
+        movq $-ENOSYS,%rax
+        jmp ia32_sysret
 
 quiet_ni_syscall:
         movq $-ENOSYS,%rax
diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c
index 41fd965c80c6..b9c830c12b4a 100644
--- a/arch/x86/kernel/early_printk.c
+++ b/arch/x86/kernel/early_printk.c
@@ -206,8 +206,11 @@ static int __init setup_early_printk(char *buf)
 
         while (*buf != '\0') {
                 if (!strncmp(buf, "serial", 6)) {
-                        early_serial_init(buf + 6);
+                        buf += 6;
+                        early_serial_init(buf);
                         early_console_register(&early_serial_console, keep);
+                        if (!strncmp(buf, ",ttyS", 5))
+                                buf += 5;
                 }
                 if (!strncmp(buf, "ttyS", 4)) {
                         early_serial_init(buf + 4);
diff --git a/arch/x86/kernel/i386_ksyms_32.c b/arch/x86/kernel/i386_ksyms_32.c
index 1736c5a725aa..9c3bd4a2050e 100644
--- a/arch/x86/kernel/i386_ksyms_32.c
+++ b/arch/x86/kernel/i386_ksyms_32.c
@@ -15,8 +15,10 @@ EXPORT_SYMBOL(mcount);
  * the export, but dont use it from C code, it is used
  * by assembly code and is not using C calling convention!
  */
+#ifndef CONFIG_X86_CMPXCHG64
 extern void cmpxchg8b_emu(void);
 EXPORT_SYMBOL(cmpxchg8b_emu);
+#endif
 
 /* Networking helper routines. */
 EXPORT_SYMBOL(csum_partial_copy_generic);
diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
index 3e549b8ec8c9..85f5db95c60f 100644
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -15,8 +15,10 @@ ifeq ($(CONFIG_X86_32),y)
         obj-y += atomic64_32.o
         lib-y += checksum_32.o
         lib-y += strstr_32.o
-        lib-y += semaphore_32.o string_32.o cmpxchg8b_emu.o
-
+        lib-y += semaphore_32.o string_32.o
+ifneq ($(CONFIG_X86_CMPXCHG64),y)
+        lib-y += cmpxchg8b_emu.o
+endif
         lib-$(CONFIG_X86_USE_3DNOW) += mmx_32.o
 else
         obj-y += io_64.o iomap_copy_64.o