[PATCH] lockdep: irqtrace subsystem, x86_64 support

Add irqflags-tracing support to x86_64.

[akpm@osdl.org: build fix]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 18 insertions, 1 deletions

diff --git a/arch/x86_64/ia32/ia32entry.S b/arch/x86_64/ia32/ia32entry.S
index c536fa98ea37..9b5bb413a6e9 100644
--- a/arch/x86_64/ia32/ia32entry.S
+++ b/arch/x86_64/ia32/ia32entry.S
@@ -13,6 +13,7 @@
 #include <asm/thread_info.h>    
 #include <asm/segment.h>
 #include <asm/vsyscall32.h>
+#include <asm/irqflags.h>
 #include <linux/linkage.h>
 
 #define IA32_NR_syscalls ((ia32_syscall_end - ia32_sys_call_table)/8)
@@ -75,6 +76,10 @@ ENTRY(ia32_sysenter_target)
         swapgs
         movq    %gs:pda_kernelstack, %rsp
         addq    $(PDA_STACKOFFSET),%rsp 
+        /*
+         * No need to follow this irqs on/off section: the syscall
+         * disabled irqs, here we enable it straight after entry:
+         */
         sti     
         movl    %ebp,%ebp               /* zero extension */
         pushq   $__USER32_DS
@@ -118,6 +123,7 @@ sysenter_do_call:
         movq    %rax,RAX-ARGOFFSET(%rsp)
         GET_THREAD_INFO(%r10)
         cli
+        TRACE_IRQS_OFF
         testl   $_TIF_ALLWORK_MASK,threadinfo_flags(%r10)
         jnz     int_ret_from_sys_call
         andl    $~TS_COMPAT,threadinfo_status(%r10)
@@ -132,6 +138,7 @@ sysenter_do_call:
         CFI_REGISTER rsp,rcx
         movl    $VSYSCALL32_SYSEXIT,%edx        /* User %eip */
         CFI_REGISTER rip,rdx
+        TRACE_IRQS_ON
         swapgs
         sti             /* sti only takes effect after the next instruction */
         /* sysexit */
@@ -186,6 +193,10 @@ ENTRY(ia32_cstar_target)
         movl    %esp,%r8d
         CFI_REGISTER    rsp,r8
         movq    %gs:pda_kernelstack,%rsp
+        /*
+         * No need to follow this irqs on/off section: the syscall
+         * disabled irqs and here we enable it straight after entry:
+         */
         sti
         SAVE_ARGS 8,1,1
         movl    %eax,%eax       /* zero extension */
@@ -220,6 +231,7 @@ cstar_do_call:
         movq %rax,RAX-ARGOFFSET(%rsp)
         GET_THREAD_INFO(%r10)
         cli
+        TRACE_IRQS_OFF
         testl $_TIF_ALLWORK_MASK,threadinfo_flags(%r10)
         jnz  int_ret_from_sys_call
         andl $~TS_COMPAT,threadinfo_status(%r10)
@@ -228,6 +240,7 @@ cstar_do_call:
         CFI_REGISTER rip,rcx
         movl EFLAGS-ARGOFFSET(%rsp),%r11d       
         /*CFI_REGISTER rflags,r11*/
+        TRACE_IRQS_ON
         movl RSP-ARGOFFSET(%rsp),%esp
         CFI_RESTORE rsp
         swapgs
@@ -286,7 +299,11 @@ ENTRY(ia32_syscall)
         /*CFI_REL_OFFSET        rflags,EFLAGS-RIP*/
         /*CFI_REL_OFFSET        cs,CS-RIP*/
         CFI_REL_OFFSET  rip,RIP-RIP
-        swapgs  
+        swapgs
+        /*
+         * No need to follow this irqs on/off section: the syscall
+         * disabled irqs and here we enable it straight after entry:
+         */
         sti
         movl %eax,%eax
         pushq %rax