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authorRoland McGrath <roland@redhat.com>2008-01-30 13:30:43 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:30:43 +0100
commit36197c92a20c142fc2a068e0366053d770fa0096 (patch)
tree796f377cadc86bb9cad36090698f6bbaec0ca0f1 /include
parent0aa97fb22624f18e5925d702ab0364d3838cfd91 (diff)
x86 vDSO: ia32 sysenter_return
This changes the 64-bit kernel's support for the 32-bit sysenter instruction to use stored fields rather than constants for the user-mode return address, as the 32-bit kernel does. This adds a sysenter_return field to struct thread_info, as 32-bit has. There is no observable effect from this yet. It makes the assembly code independent of the 32-bit vDSO mapping address, paving the way for making the vDSO address vary as it does on the 32-bit kernel. [ akpm@linux-foundation.org: build fix on !CONFIG_IA32_EMULATION ] Signed-off-by: Roland McGrath <roland@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include')
-rw-r--r--include/asm-x86/thread_info_64.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/asm-x86/thread_info_64.h b/include/asm-x86/thread_info_64.h
index 1ac23c15723..c8e7736fc79 100644
--- a/include/asm-x86/thread_info_64.h
+++ b/include/asm-x86/thread_info_64.h
@@ -33,6 +33,9 @@ struct thread_info {
mm_segment_t addr_limit;
struct restart_block restart_block;
+#ifdef CONFIG_IA32_EMULATION
+ void __user *sysenter_return;
+#endif
};
#endif