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Groups > linux.kernel > #1727763
| From | Andy Lutomirski <luto@kernel.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [RFC 07/17] x86/asm/64: Merge the fast and slow SYSRET paths |
| Date | 2017-09-06 23:40 +0200 |
| Message-ID | <umQdd-7qi-31@gated-at.bofh.it> (permalink) |
| References | <umQdc-7qi-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Signed-off-by: Andy Lutomirski <luto@kernel.org> --- arch/x86/entry/entry_64.S | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 45d4cb8fd81b..a9e318f7cc9b 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -216,9 +216,8 @@ entry_SYSCALL_64_fastpath: TRACE_IRQS_ON /* user mode is traced as IRQs on */ movq RIP(%rsp), %rcx movq EFLAGS(%rsp), %r11 - RESTORE_C_REGS_EXCEPT_RCX_R11 - movq RSP(%rsp), %rsp - USERGS_SYSRET64 + addq $6*8, %rsp + jmp .Lpop_c_regs_and_sysret 1: /* @@ -309,6 +308,7 @@ return_from_SYSCALL_64: syscall_return_via_sysret: /* rcx and r11 are already restored (see code above) */ POP_EXTRA_REGS +.Lpop_c_regs_and_sysret: popq %rsi /* skip r11 */ popq %r10 popq %r9 -- 2.13.5
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[RFC 07/17] x86/asm/64: Merge the fast and slow SYSRET paths Andy Lutomirski <luto@kernel.org> - 2017-09-06 23:40 +0200
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