Path: csiph.com!aioe.org!news.e-liance.net!news.e-liance.net!feeds.phibee-telecom.net!news.panservice.it!bofh.it!news.nic.it!robomod From: Andy Lutomirski Newsgroups: linux.kernel Subject: [PATCH v3 11/15] x86/asm/entry/64: Simplify irq stack pt_regs handling Date: Wed, 24 Jun 2015 04:50:02 +0200 Message-ID: References: X-Original-To: x86@kernel.org, linux-kernel@vger.kernel.org X-Mailer: git-send-email 2.4.3 Sender: robomod@news.nic.it List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Approved: robomod@news.nic.it Lines: 46 Organization: linux.* mail to news gateway X-Original-Cc: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Weisbecker?= , Rik van Riel , Oleg Nesterov , Denys Vlasenko , Borislav Petkov , Kees Cook , Brian Gerst , paulmck@linux.vnet.ibm.com, Andy Lutomirski X-Original-Date: Tue, 23 Jun 2015 19:46:14 -0700 X-Original-Message-ID: <79b6a6554e6befe737089f1a3ea6a99bda949516.1435113808.git.luto@kernel.org> X-Original-References: X-Original-Sender: linux-kernel-owner@vger.kernel.org Xref: aioe.org linux.kernel:1171046 There's no need for both rsi and rdi to point to the original stack. Signed-off-by: Andy Lutomirski --- arch/x86/entry/entry_64.S | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 3fdfd3e27918..ce2d10933c11 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -505,8 +505,6 @@ END(irq_entries_start) SAVE_C_REGS SAVE_EXTRA_REGS - movq %rsp,%rdi /* arg1 for \func (pointer to pt_regs) */ - testb $3, CS(%rsp) jz 1f SWAPGS @@ -518,14 +516,14 @@ END(irq_entries_start) * a little cheaper to use a separate counter in the PDA (short of * moving irq_enter into assembly, which would be too much work) */ - movq %rsp, %rsi + movq %rsp, %rdi incl PER_CPU_VAR(irq_count) cmovzq PER_CPU_VAR(irq_stack_ptr), %rsp - pushq %rsi + pushq %rdi /* We entered an interrupt context - irqs are off: */ TRACE_IRQS_OFF - call \func + call \func /* rdi points to pt_regs */ .endm /* -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/