Commit-ID: a586f98e9767fb0dfdb989002866b4024f00ce08 Gitweb: http://git.kernel.org/tip/a586f98e9767fb0dfdb989002866b4024f00ce08 Author: Andy Lutomirski <l...@kernel.org> AuthorDate: Fri, 3 Jul 2015 12:44:30 -0700 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Tue, 7 Jul 2015 10:59:08 +0200
x86/asm/entry/64: Simplify IRQ stack pt_regs handling There's no need for both RSI and RDI to point to the original stack. Signed-off-by: Andy Lutomirski <l...@kernel.org> Cc: Andy Lutomirski <l...@amacapital.net> Cc: Borislav Petkov <b...@alien8.de> Cc: Brian Gerst <brge...@gmail.com> Cc: Denys Vlasenko <dvlas...@redhat.com> Cc: Denys Vlasenko <vda.li...@googlemail.com> Cc: Frederic Weisbecker <fweis...@gmail.com> Cc: H. Peter Anvin <h...@zytor.com> Cc: Kees Cook <keesc...@chromium.org> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Oleg Nesterov <o...@redhat.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Rik van Riel <r...@redhat.com> Cc: Thomas Gleixner <t...@linutronix.de> Cc: paul...@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/3a0481f809dd340c7d3f54ce3fd6d66ef2a578cd.1435952415.git.l...@kernel.org Signed-off-by: Ingo Molnar <mi...@kernel.org> --- 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 65029f4..83eb63d 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -506,8 +506,6 @@ 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 @@ -519,14 +517,14 @@ 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 /* -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
