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a798f09111
linux/arch/x86/entry
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Andy Lutomirski a798f09111 x86/entry/32: Change INT80 to be an interrupt gate 
We want all of the syscall entries to run with interrupts off so that
we can efficiently run context tracking before enabling interrupts.

This will regress int $0x80 performance on 32-bit kernels by a
couple of cycles.  This shouldn't matter much -- int $0x80 is not a
fast path.

This effectively reverts:

  657c1eea00 ("x86/entry/32: Fix entry_INT80_32() to expect interrupts to be on")

... and fixes the same issue differently.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/59b4f90c9ebfccd8c937305dbbbca680bc74b905.1457558566.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-03-10 10:53:26 +01:00
..
syscalls x86/syscalls/64: Mark sys_iopl() as using ptregs 2016-02-01 08:53:25 +01:00
vdso x86/vdso: Use static_cpu_has() 2016-01-30 11:22:23 +01:00
vsyscall x86/vdso: Disallow vvar access to vclock IO for never-used vclocks 2016-01-12 11:59:35 +01:00
calling.h x86/asm/entry: Remove unused SAVE_ALL/RESTORE_ALL macros for !CONFIG_x86_64 2016-01-19 08:24:03 +01:00
common.c x86/entry/32: Change INT80 to be an interrupt gate 2016-03-10 10:53:26 +01:00
entry_32.S x86/entry/32: Change INT80 to be an interrupt gate 2016-03-10 10:53:26 +01:00
entry_64_compat.S x86/entry/32: Change INT80 to be an interrupt gate 2016-03-10 10:53:26 +01:00
entry_64.S x86/entry: Improve system call entry comments 2016-03-10 09:48:15 +01:00
Makefile x86/entry: Move C entry and exit code to arch/x86/entry/common.c 2015-07-07 10:59:05 +02:00
syscall_32.c x86/syscalls: Add syscall entry qualifiers 2016-01-29 09:46:38 +01:00
syscall_64.c x86/entry/64: Always run ptregs-using syscalls on the slow path 2016-01-29 09:46:38 +01:00
thunk_32.S
thunk_64.S