x86/asm/entry/64: Merge 32-bit execve stubs with x32 ones, as they are identical

Run-tested.

Suggested-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1429632194-13445-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 3c78a15a537d40af94261f4d6f48385d40dadd75..e952f6bf1d6d2d261fd5d0e569611f1e0dc64cbe 100644 (file)
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -525,40 +525,27 @@ GLOBAL(stub_execveat)
        CFI_ENDPROC
 END(stub_execveat)
 
-#ifdef CONFIG_X86_X32_ABI
+#if defined(CONFIG_X86_X32_ABI) || defined(CONFIG_IA32_EMULATION)
        .align  8
 GLOBAL(stub_x32_execve)
+GLOBAL(stub32_execve)
        CFI_STARTPROC
        DEFAULT_FRAME 0, 8
        call    compat_sys_execve
        jmp     return_from_execve
        CFI_ENDPROC
+END(stub32_execve)
 END(stub_x32_execve)
        .align  8
 GLOBAL(stub_x32_execveat)
-       CFI_STARTPROC
-       DEFAULT_FRAME 0, 8
-       call    compat_sys_execveat
-       jmp     return_from_execve
-       CFI_ENDPROC
-END(stub_x32_execveat)
-#endif
-
-#ifdef CONFIG_IA32_EMULATION
-       .align  8
-GLOBAL(stub32_execve)
-       CFI_STARTPROC
-       call    compat_sys_execve
-       jmp     return_from_execve
-       CFI_ENDPROC
-END(stub32_execve)
-       .align  8
 GLOBAL(stub32_execveat)
        CFI_STARTPROC
+       DEFAULT_FRAME 0, 8
        call    compat_sys_execveat
        jmp     return_from_execve
        CFI_ENDPROC
 END(stub32_execveat)
+END(stub_x32_execveat)
 #endif
 
 /*