Steven Rostedt (Red Hat) b35f549df1 syscalls: Remove start and number from syscall_get_arguments() args ...

At Linux Plumbers, Andy Lutomirski approached me and pointed out that the
function call syscall_get_arguments() implemented in x86 was horribly
written and not optimized for the standard case of passing in 0 and 6 for
the starting index and the number of system calls to get. When looking at
all the users of this function, I discovered that all instances pass in only
0 and 6 for these arguments. Instead of having this function handle
different cases that are never used, simply rewrite it to return the first 6
arguments of a system call.

This should help out the performance of tracing system calls by ptrace,
ftrace and perf.

Link: http://lkml.kernel.org/r/20161107213233.754809394@goodmis.org

Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Dave Martin <dave.martin@arm.com>
Cc: "Dmitry V. Levin" <ldv@altlinux.org>
Cc: x86@kernel.org
Cc: linux-snps-arc@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-c6x-dev@linux-c6x.org
Cc: uclinux-h8-devel@lists.sourceforge.jp
Cc: linux-hexagon@vger.kernel.org
Cc: linux-ia64@vger.kernel.org
Cc: linux-mips@vger.kernel.org
Cc: nios2-dev@lists.rocketboards.org
Cc: openrisc@lists.librecores.org
Cc: linux-parisc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-riscv@lists.infradead.org
Cc: linux-s390@vger.kernel.org
Cc: linux-sh@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Cc: linux-um@lists.infradead.org
Cc: linux-xtensa@linux-xtensa.org
Cc: linux-arch@vger.kernel.org
Acked-by: Paul Burton <paul.burton@mips.com> # MIPS parts
Acked-by: Max Filippov <jcmvbkbc@gmail.com> # For xtensa changes
Acked-by: Will Deacon <will.deacon@arm.com> # For the arm64 bits
Reviewed-by: Thomas Gleixner <tglx@linutronix.de> # for x86
Reviewed-by: Dmitry V. Levin <ldv@altlinux.org>
Reported-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

2019-04-05 09:26:43 -04:00

..

asm-offsets.h

Hexagon: Add processor and system headers

2011-11-01 07:34:18 -07:00

atomic.h

atomics/treewide: Make unconditional inc/dec ops optional

2018-06-21 14:25:24 +02:00

bitops.h

fls: change parameter to unsigned int

2019-01-04 13:13:46 -08:00

cache.h

Hexagon: set ARCH_DMA_MINALIGN

2014-12-16 13:27:30 -06:00

cacheflush.h

hexagon: Fix build failures in linux-next

2014-12-16 13:27:12 -06:00

checksum.h

ipv4: Update parameters for csum_tcpudp_magic to their original types

2016-03-13 23:55:13 -04:00

cmpxchg.h

arch: Remove __ARCH_HAVE_CMPXCHG

2015-05-13 10:55:42 +02:00

delay.h

arch: hexagon: kernel: add export symbol function __delay()

2014-04-04 18:19:59 -05:00

dma.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

elf.h

Hexagon: update CR year for elf.h

2014-04-04 18:20:02 -05:00

exec.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

fixmap.h

hexagon: use generic fixmap.h

2014-01-23 16:36:54 -08:00

fpu.h

…

futex.h

Remove 'type' argument from access_ok() function

2019-01-03 18:57:57 -08:00

hexagon_vm.h

hexagon: Fix misspellings in comments.

2016-04-18 12:45:54 +02:00

intrinsics.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

io.h

hexagon: add memset_io() helper

2018-05-01 15:49:46 -05:00

irq.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

irqflags.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

Kbuild

KVM: export <linux/kvm_para.h> and <asm/kvm_para.h> iif KVM is supported

2019-03-28 17:27:42 +01:00

kgdb.h

hexagon: include: asm: kgdb: extend DBG_MAX_REG_NUM for "cs0/1"

2014-04-04 18:19:59 -05:00

linkage.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

mem-layout.h

Hexagon: use correct translation for VMALLOC_START

2013-04-30 19:40:29 -05:00

mmu_context.h

sched/headers: Prepare to remove the <linux/mm_types.h> dependency from <linux/sched.h>

2017-03-02 08:42:37 +01:00

mmu.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

module.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

page.h

Hexagon: use correct translations for DMA mappings

2013-04-30 19:40:28 -05:00

perf_event.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

pgalloc.h

mm: treewide: remove unused address argument from pte_alloc functions

2019-01-04 13:13:47 -08:00

pgtable.h

hexagon: drop the unused variable zero_page_mask

2018-06-15 07:55:25 +09:00

processor.h

treewide: remove current_text_addr

2018-10-31 08:54:12 -07:00

smp.h

smp, hexagon: kill SMP single function call interrupt

2014-04-04 18:20:01 -05:00

spinlock_types.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

spinlock.h

locking/arch: Remove dummy arch_{read,spin,write}_lock_flags() implementations

2017-10-10 11:50:19 +02:00

string.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

suspend.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

switch_to.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

syscall.h

syscalls: Remove start and number from syscall_get_arguments() args

2019-04-05 09:26:43 -04:00

thread_info.h

Construct init thread stack in the linker script rather than by union

2018-01-09 23:21:02 +00:00

time.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

timer-regs.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

timex.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

tlb.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

tlbflush.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

traps.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

uaccess.h

Remove 'type' argument from access_ok() function

2019-01-03 18:57:57 -08:00

vdso.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

vm_fault.h

Hexagon: Copyright marking changes

2012-10-18 17:07:21 -05:00

vm_mmu.h

hexagon: Fix misspellings in comments.

2016-04-18 12:45:54 +02:00