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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
..
alpha KVM: export <linux/kvm_para.h> and <asm/kvm_para.h> iif KVM is supported 2019-03-28 17:27:42 +01:00
arc syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
arm syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
arm64 syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
c6x syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
csky syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
h8300 syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
hexagon syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
ia64 syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
m68k KVM: export <linux/kvm_para.h> and <asm/kvm_para.h> iif KVM is supported 2019-03-28 17:27:42 +01:00
microblaze syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
mips syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
nds32 syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
nios2 syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
openrisc syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
parisc syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
powerpc syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
riscv syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
s390 syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
sh syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
sparc syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
um syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
unicore32 KVM: export <linux/kvm_para.h> and <asm/kvm_para.h> iif KVM is supported 2019-03-28 17:27:42 +01:00
x86 syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
xtensa syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
.gitignore
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Kconfig Char/Misc driver patches for 5.1-rc1 2019-03-06 14:18:59 -08:00