The entry_SYSCALL_64_fastpath was checking the value of __SYSCALL_MASK,
which in turn was being set in arch/x86/include/asm/unistd.h depending on
whether CONFIG_X86_X32_ABI was set or not. This made the intention a bit
cryptic.
Juggle the code around so that the conditional compilation depends on
the value of CONFIG_X86_X32_ABI
---
arch/x86/entry/entry_64.S | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 8cb3e43..b0177f9 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -175,11 +175,11 @@ GLOBAL(entry_SYSCALL_64_after_swapgs)
testl $_TIF_WORK_SYSCALL_ENTRY, ASM_THREAD_INFO(TI_flags, %rsp,
SIZEOF_PTREGS)
jnz tracesys
entry_SYSCALL_64_fastpath:
-#if __SYSCALL_MASK == ~0
- cmpq $__NR_syscall_max, %rax
-#else
+#ifdef CONFIG_X86_X32_ABI
andl $__SYSCALL_MASK, %eax
cmpl $__NR_syscall_max, %eax
+#else
+ cmpq $__NR_syscall_max, %rax
#endif
ja 1f /* return -ENOSYS (already in
pt_regs->ax) */
movq %r10, %rcx
--
2.1.4
--
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