From: Brian Gerst Date: Fri, 21 Jul 2023 16:10:16 +0000 (-0400) Subject: x86/entry/32: Remove SEP test for SYSEXIT X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=bab9fa6dc5e4483749838877deebe038de3ce97e;p=linux.git x86/entry/32: Remove SEP test for SYSEXIT SEP must be already be present in order for do_fast_syscall_32() to be called on native 32-bit, so checking it again is unnecessary. Signed-off-by: Brian Gerst Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20230721161018.50214-6-brgerst@gmail.com --- diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c index f1f3bf150b57f..0551bcb197fb1 100644 --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -238,8 +238,7 @@ __visible noinstr bool do_fast_syscall_32(struct pt_regs *regs) * We don't allow syscalls at all from VM86 mode, but we still * need to check VM, because we might be returning from sys_vm86. */ - return static_cpu_has(X86_FEATURE_SEP) && - regs->cs == __USER_CS && regs->ss == __USER_DS && + return regs->cs == __USER_CS && regs->ss == __USER_DS && regs->ip == landing_pad && (regs->flags & (X86_EFLAGS_RF | X86_EFLAGS_TF | X86_EFLAGS_VM)) == 0; #endif