The patch titled
Subject: sparc/compat: provide an accurate in_compat_syscall implementation
has been removed from the -mm tree. Its filename was
sparc-compat-provide-an-accurate-in_compat_syscall-implementation.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Andy Lutomirski <luto@xxxxxxxxxx>
Subject: sparc/compat: provide an accurate in_compat_syscall implementation
On sparc64 compat-enabled kernels, any task can make 32-bit and 64-bit
syscalls. is_compat_task returns true in 32-bit tasks, which does not
necessarily imply that the current syscall is 32-bit.
Provide an in_compat_syscall implementation that checks whether the
current syscall is compat.
As far as I know, sparc is the only architecture on which is_compat_task
checks the compat status of the task and on which the compat status of a
syscall can differ from the compat status of the task. On x86,
is_compat_task checks the syscall type, not the task type.
[akpm@xxxxxxxxxxxxxxxxxxxx: add comment, per Sam]
[akpm@xxxxxxxxxxxxxxxxxxxx: update comment, per Andy]
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/sparc/include/asm/compat.h | 7 +++++++
1 file changed, 7 insertions(+)
diff -puN arch/sparc/include/asm/compat.h~sparc-compat-provide-an-accurate-in_compat_syscall-implementation arch/sparc/include/asm/compat.h
--- a/arch/sparc/include/asm/compat.h~sparc-compat-provide-an-accurate-in_compat_syscall-implementation
+++ a/arch/sparc/include/asm/compat.h
@@ -307,4 +307,11 @@ static inline int is_compat_task(void)
return test_thread_flag(TIF_32BIT);
}
+static inline bool in_compat_syscall(void)
+{
+ /* Vector 0x110 is LINUX_32BIT_SYSCALL_TRAP */
+ return pt_regs_trap_type(current_pt_regs()) == 0x110;
+}
+#define in_compat_syscall in_compat_syscall
+
#endif /* _ASM_SPARC64_COMPAT_H */
_
Patches currently in -mm which might be from luto@xxxxxxxxxx are
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