arm64: entry: remove unused register aliases

In commit:

  3b7142752e4bee15 ("arm64: convert native/compat syscall entry to C")

... we moved the syscall invocation code from assembly to C, but left
behind a number of register aliases which are now unused.

Let's remove them before they confuse someone.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 763f03d..0ec0c46 100644 (file)
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -392,17 +392,7 @@ alternative_insn eret, nop, ARM64_UNMAP_KERNEL_AT_EL0
        mov     sp, x19
        .endm
 
-/*
- * These are the registers used in the syscall handler, and allow us to
- * have in theory up to 7 arguments to a function - x0 to x6.
- *
- * x7 is reserved for the system call number in 32-bit mode.
- */
-wsc_nr .req    w25             // number of system calls
-xsc_nr .req    x25             // number of system calls (zero-extended)
-wscno  .req    w26             // syscall number
-xscno  .req    x26             // syscall number (zero-extended)
-stbl   .req    x27             // syscall table pointer
+/* GPRs used by entry code */
 tsk    .req    x28             // current thread_info
 
 /*