* [PATCH] arm64: remove unneeded copy to init_utsname()->machine
@ 2017-09-14 11:40 Masahiro Yamada
2017-10-11 13:03 ` Masahiro Yamada
0 siblings, 1 reply; 3+ messages in thread
From: Masahiro Yamada @ 2017-09-14 11:40 UTC (permalink / raw)
To: linux-arm-kernel, Will Deacon, Catalin Marinas
Cc: Michal Marek, Masahiro Yamada, Alexander Popov, James Morse,
linux-kernel, AKASHI Takahiro, Laura Abbott, Ingo Molnar,
Ard Biesheuvel, Geert Uytterhoeven, Mark Rutland
As you see in init/version.c, init_uts_ns.name.machine is initially
set to UTS_MACHINE. There is no point to copy the same string.
I dug the git history to figure out why this line is here. My best
guess is like this:
- This line has been around here since the initial support of arm64
by commit 9703d9d7f77c ("arm64: Kernel booting and initialisation").
If ARCH (=arm64) and UTS_MACHINE (=aarch64) do not match,
arch/$(ARCH)/Makefile is supposed to override UTS_MACHINE, but the
initial version of arch/arm64/Makefile missed to do that. Instead,
the boot code copied "aarch64" to init_utsname()->machine.
- Commit 94ed1f2cb5d4 ("arm64: setup: report ELF_PLATFORM as the
machine for utsname") replaced "aarch64" with ELF_PLATFORM to
make "uname" to reflect the endianness.
- ELF_PLATFORM does not help to provide the UTS machine name to rpm
target, so commit cfa88c79462d ("arm64: Set UTS_MACHINE in the
Makefile") fixed it. The commit simply replaced ELF_PLATFORM with
UTS_MACHINE, but missed the fact the string copy itself is no longer
needed.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---
arch/arm64/kernel/Makefile | 2 --
arch/arm64/kernel/setup.c | 2 --
2 files changed, 4 deletions(-)
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index f2b4e81..29764d7 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -10,8 +10,6 @@ CFLAGS_REMOVE_ftrace.o = -pg
CFLAGS_REMOVE_insn.o = -pg
CFLAGS_REMOVE_return_address.o = -pg
-CFLAGS_setup.o = -DUTS_MACHINE='"$(UTS_MACHINE)"'
-
# Object file lists.
arm64-obj-y := debug-monitors.o entry.o irq.o fpsimd.o \
entry-fpsimd.o process.o ptrace.o setup.o signal.o \
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index d4b7405..b2fdb59 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -23,7 +23,6 @@
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/delay.h>
-#include <linux/utsname.h>
#include <linux/initrd.h>
#include <linux/console.h>
#include <linux/cache.h>
@@ -246,7 +245,6 @@ void __init setup_arch(char **cmdline_p)
{
pr_info("Boot CPU: AArch64 Processor [%08x]\n", read_cpuid_id());
- sprintf(init_utsname()->machine, UTS_MACHINE);
init_mm.start_code = (unsigned long) _text;
init_mm.end_code = (unsigned long) _etext;
init_mm.end_data = (unsigned long) _edata;
--
2.7.4
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] arm64: remove unneeded copy to init_utsname()->machine
2017-09-14 11:40 [PATCH] arm64: remove unneeded copy to init_utsname()->machine Masahiro Yamada
@ 2017-10-11 13:03 ` Masahiro Yamada
2017-10-11 13:13 ` Mark Rutland
0 siblings, 1 reply; 3+ messages in thread
From: Masahiro Yamada @ 2017-10-11 13:03 UTC (permalink / raw)
To: linux-arm-kernel, Will Deacon, Catalin Marinas
Cc: Michal Marek, Masahiro Yamada, Alexander Popov, James Morse,
Linux Kernel Mailing List, AKASHI Takahiro, Laura Abbott,
Ingo Molnar, Ard Biesheuvel, Geert Uytterhoeven, Mark Rutland
Hi arm64 maintainers,
Could you check this please?
2017-09-14 20:40 GMT+09:00 Masahiro Yamada <yamada.masahiro@socionext.com>:
> As you see in init/version.c, init_uts_ns.name.machine is initially
> set to UTS_MACHINE. There is no point to copy the same string.
>
> I dug the git history to figure out why this line is here. My best
> guess is like this:
>
> - This line has been around here since the initial support of arm64
> by commit 9703d9d7f77c ("arm64: Kernel booting and initialisation").
> If ARCH (=arm64) and UTS_MACHINE (=aarch64) do not match,
> arch/$(ARCH)/Makefile is supposed to override UTS_MACHINE, but the
> initial version of arch/arm64/Makefile missed to do that. Instead,
> the boot code copied "aarch64" to init_utsname()->machine.
>
> - Commit 94ed1f2cb5d4 ("arm64: setup: report ELF_PLATFORM as the
> machine for utsname") replaced "aarch64" with ELF_PLATFORM to
> make "uname" to reflect the endianness.
>
> - ELF_PLATFORM does not help to provide the UTS machine name to rpm
> target, so commit cfa88c79462d ("arm64: Set UTS_MACHINE in the
> Makefile") fixed it. The commit simply replaced ELF_PLATFORM with
> UTS_MACHINE, but missed the fact the string copy itself is no longer
> needed.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> ---
>
> arch/arm64/kernel/Makefile | 2 --
> arch/arm64/kernel/setup.c | 2 --
> 2 files changed, 4 deletions(-)
>
> diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
> index f2b4e81..29764d7 100644
> --- a/arch/arm64/kernel/Makefile
> +++ b/arch/arm64/kernel/Makefile
> @@ -10,8 +10,6 @@ CFLAGS_REMOVE_ftrace.o = -pg
> CFLAGS_REMOVE_insn.o = -pg
> CFLAGS_REMOVE_return_address.o = -pg
>
> -CFLAGS_setup.o = -DUTS_MACHINE='"$(UTS_MACHINE)"'
> -
> # Object file lists.
> arm64-obj-y := debug-monitors.o entry.o irq.o fpsimd.o \
> entry-fpsimd.o process.o ptrace.o setup.o signal.o \
> diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
> index d4b7405..b2fdb59 100644
> --- a/arch/arm64/kernel/setup.c
> +++ b/arch/arm64/kernel/setup.c
> @@ -23,7 +23,6 @@
> #include <linux/stddef.h>
> #include <linux/ioport.h>
> #include <linux/delay.h>
> -#include <linux/utsname.h>
> #include <linux/initrd.h>
> #include <linux/console.h>
> #include <linux/cache.h>
> @@ -246,7 +245,6 @@ void __init setup_arch(char **cmdline_p)
> {
> pr_info("Boot CPU: AArch64 Processor [%08x]\n", read_cpuid_id());
>
> - sprintf(init_utsname()->machine, UTS_MACHINE);
> init_mm.start_code = (unsigned long) _text;
> init_mm.end_code = (unsigned long) _etext;
> init_mm.end_data = (unsigned long) _edata;
> --
> 2.7.4
>
--
Best Regards
Masahiro Yamada
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] arm64: remove unneeded copy to init_utsname()->machine
2017-10-11 13:03 ` Masahiro Yamada
@ 2017-10-11 13:13 ` Mark Rutland
0 siblings, 0 replies; 3+ messages in thread
From: Mark Rutland @ 2017-10-11 13:13 UTC (permalink / raw)
To: Masahiro Yamada
Cc: linux-arm-kernel, Will Deacon, Catalin Marinas, Michal Marek,
Alexander Popov, James Morse, Linux Kernel Mailing List,
AKASHI Takahiro, Laura Abbott, Ingo Molnar, Ard Biesheuvel,
Geert Uytterhoeven
Hi,
On Wed, Oct 11, 2017 at 10:03:28PM +0900, Masahiro Yamada wrote:
> Hi arm64 maintainers,
>
> Could you check this please?
This patch has been queued [1] in arm64's for-next/core branch [2], and
should be in v4.15.
Thanks,
Mark.
[1] https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/commit/?h=for-next/core&id=c2f0b54f10b12620c57f6e31233589b704a00ed5
[2] https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=for-next/core
> 2017-09-14 20:40 GMT+09:00 Masahiro Yamada <yamada.masahiro@socionext.com>:
> > As you see in init/version.c, init_uts_ns.name.machine is initially
> > set to UTS_MACHINE. There is no point to copy the same string.
> >
> > I dug the git history to figure out why this line is here. My best
> > guess is like this:
> >
> > - This line has been around here since the initial support of arm64
> > by commit 9703d9d7f77c ("arm64: Kernel booting and initialisation").
> > If ARCH (=arm64) and UTS_MACHINE (=aarch64) do not match,
> > arch/$(ARCH)/Makefile is supposed to override UTS_MACHINE, but the
> > initial version of arch/arm64/Makefile missed to do that. Instead,
> > the boot code copied "aarch64" to init_utsname()->machine.
> >
> > - Commit 94ed1f2cb5d4 ("arm64: setup: report ELF_PLATFORM as the
> > machine for utsname") replaced "aarch64" with ELF_PLATFORM to
> > make "uname" to reflect the endianness.
> >
> > - ELF_PLATFORM does not help to provide the UTS machine name to rpm
> > target, so commit cfa88c79462d ("arm64: Set UTS_MACHINE in the
> > Makefile") fixed it. The commit simply replaced ELF_PLATFORM with
> > UTS_MACHINE, but missed the fact the string copy itself is no longer
> > needed.
> >
> > Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> > ---
> >
> > arch/arm64/kernel/Makefile | 2 --
> > arch/arm64/kernel/setup.c | 2 --
> > 2 files changed, 4 deletions(-)
> >
> > diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
> > index f2b4e81..29764d7 100644
> > --- a/arch/arm64/kernel/Makefile
> > +++ b/arch/arm64/kernel/Makefile
> > @@ -10,8 +10,6 @@ CFLAGS_REMOVE_ftrace.o = -pg
> > CFLAGS_REMOVE_insn.o = -pg
> > CFLAGS_REMOVE_return_address.o = -pg
> >
> > -CFLAGS_setup.o = -DUTS_MACHINE='"$(UTS_MACHINE)"'
> > -
> > # Object file lists.
> > arm64-obj-y := debug-monitors.o entry.o irq.o fpsimd.o \
> > entry-fpsimd.o process.o ptrace.o setup.o signal.o \
> > diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
> > index d4b7405..b2fdb59 100644
> > --- a/arch/arm64/kernel/setup.c
> > +++ b/arch/arm64/kernel/setup.c
> > @@ -23,7 +23,6 @@
> > #include <linux/stddef.h>
> > #include <linux/ioport.h>
> > #include <linux/delay.h>
> > -#include <linux/utsname.h>
> > #include <linux/initrd.h>
> > #include <linux/console.h>
> > #include <linux/cache.h>
> > @@ -246,7 +245,6 @@ void __init setup_arch(char **cmdline_p)
> > {
> > pr_info("Boot CPU: AArch64 Processor [%08x]\n", read_cpuid_id());
> >
> > - sprintf(init_utsname()->machine, UTS_MACHINE);
> > init_mm.start_code = (unsigned long) _text;
> > init_mm.end_code = (unsigned long) _etext;
> > init_mm.end_data = (unsigned long) _edata;
> > --
> > 2.7.4
> >
>
>
>
> --
> Best Regards
> Masahiro Yamada
^ permalink raw reply [flat|nested] 3+ messages in thread
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2017-09-14 11:40 [PATCH] arm64: remove unneeded copy to init_utsname()->machine Masahiro Yamada
2017-10-11 13:03 ` Masahiro Yamada
2017-10-11 13:13 ` Mark Rutland
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