Messages in this thread Patch in this message | | | From | Andy Lutomirski <> | Subject | [RFC 01/17] x86/asm/64: Remove the restore_c_regs_and_iret label | Date | Wed, 6 Sep 2017 14:36:46 -0700 |
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The only user was the 64-bit opportunistic SYSRET failure path, and that path didn't really need it. This change makes the opportunistic SYSRET code a bit more straightforward and gets rid of the label.
Signed-off-by: Andy Lutomirski <luto@kernel.org> --- arch/x86/entry/entry_64.S | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index e995ea828789..a0ebeeb9d12f 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -240,7 +240,6 @@ entry_SYSCALL64_slow_path: call do_syscall_64 /* returns with IRQs disabled */ return_from_SYSCALL_64: - RESTORE_EXTRA_REGS TRACE_IRQS_IRETQ /* we're about to change IF */ /* @@ -309,13 +308,14 @@ return_from_SYSCALL_64: */ syscall_return_via_sysret: /* rcx and r11 are already restored (see code above) */ + RESTORE_EXTRA_REGS RESTORE_C_REGS_EXCEPT_RCX_R11 movq RSP(%rsp), %rsp USERGS_SYSRET64 opportunistic_sysret_failed: SWAPGS - jmp restore_c_regs_and_iret + jmp restore_regs_and_iret END(entry_SYSCALL_64) ENTRY(stub_ptregs_64) @@ -550,7 +550,6 @@ retint_kernel: */ GLOBAL(restore_regs_and_iret) RESTORE_EXTRA_REGS -restore_c_regs_and_iret: RESTORE_C_REGS REMOVE_PT_GPREGS_FROM_STACK 8 INTERRUPT_RETURN -- 2.13.5
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