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linux-next/arch/x86/entry
Andy Lutomirski 21d375b6b3 x86/entry/64: Remove the SYSCALL64 fast path
The SYCALLL64 fast path was a nice, if small, optimization back in the good
old days when syscalls were actually reasonably fast.  Now there is PTI to
slow everything down, and indirect branches are verboten, making everything
messier.  The retpoline code in the fast path is particularly nasty.

Just get rid of the fast path. The slow path is barely slower.

[ tglx: Split out the 'push all extra regs' part ]

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Kernel Hardening <kernel-hardening@lists.openwall.com>
Link: https://lkml.kernel.org/r/462dff8d4d64dfbfc851fbf3130641809d980ecd.1517164461.git.luto@kernel.org
2018-01-30 15:30:36 +01:00
..
syscalls Merge branch 'x86/build' into x86/asm, to fix up conflicts 2017-11-07 10:54:30 +01:00
vdso Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-12-06 17:47:29 -08:00
vsyscall x86/pti: Map the vsyscall page if needed 2017-12-23 21:13:00 +01:00
calling.h x86/pti: Fix !PCID and sanitize defines 2018-01-14 10:45:53 +01:00
common.c x86: Use lockdep to assert IRQs are disabled/enabled 2017-11-08 11:13:50 +01:00
entry_32.S x86/retpoline: Simplify vmexit_fill_RSB() 2018-01-27 19:10:45 +01:00
entry_64_compat.S x86/pti: Switch to kernel CR3 at early in entry_SYSCALL_compat() 2018-01-03 23:19:32 +01:00
entry_64.S x86/entry/64: Remove the SYSCALL64 fast path 2018-01-30 15:30:36 +01:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
syscall_32.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
syscall_64.c x86/entry/64: Remove the SYSCALL64 fast path 2018-01-30 15:30:36 +01:00
thunk_32.S x86: move exports to actual definitions 2016-08-07 23:47:15 -04:00
thunk_64.S x86: move exports to actual definitions 2016-08-07 23:47:15 -04:00