From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Jisheng Zhang <Jisheng.Zhang@synaptics.com>,
Vineet Gupta <vgupta@synopsys.com>,
Russell King <linux@armlinux.org.uk>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
Brian Cain <bcain@codeaurora.org>, Nick Hu <nickhu@andestech.com>,
Greentime Hu <green.hu@gmail.com>,
Vincent Chen <deanbo422@gmail.com>,
Ley Foon Tan <ley.foon.tan@intel.com>,
Jonas Bonn <jonas@southpole.se>,
Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
Stafford Horne <shorne@gmail.com>,
"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
Helge Deller <deller@gmx.de>,
Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>, Jeff Dike <jdike@addtoit.com>,
Richard Weinberger <richard@nod.at>,
Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: uclinux-h8-devel@lists.sourceforge.jp,
linux-parisc@vger.kernel.org, linux-hexagon@vger.kernel.org,
linux-um@lists.infradead.org, linux-kernel@vger.kernel.org,
openrisc@lists.librecores.org, Anup Patel <anup@brainfault.org>,
linux-riscv@lists.infradead.org,
linux-snps-arc@lists.infradead.org,
linuxppc-dev@lists.ozlabs.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] init: consolidate trap_init()
Date: Wed, 14 Apr 2021 11:10:42 +0200 [thread overview]
Message-ID: <44bdf1f1-117d-0f10-fc59-9edd32d1ad61@csgroup.eu> (raw)
In-Reply-To: <20210414165808.458a3d11@xhacker.debian>
Le 14/04/2021 à 10:58, Jisheng Zhang a écrit :
> Many architectures implement the trap_init() as NOP, since there is
> no such default for trap_init(), this empty stub is duplicated among
> these architectures. Provide a generic but weak NOP implementation
> to drop the empty stubs of trap_init() in these architectures.
You define the weak function in the __init section.
Most but not all architectures had it in __init section.
And the remaining ones may not be defined in __init section. For instance look at the one in alpha
architecture.
Have you checked that it is not a problem ? It would be good to say something about it in the commit
description.
>
> Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
> ---
> arch/arc/kernel/traps.c | 5 -----
> arch/arm/kernel/traps.c | 5 -----
> arch/h8300/kernel/traps.c | 13 -------------
> arch/hexagon/kernel/traps.c | 4 ----
> arch/nds32/kernel/traps.c | 5 -----
> arch/nios2/kernel/traps.c | 5 -----
> arch/openrisc/kernel/traps.c | 5 -----
> arch/parisc/kernel/traps.c | 4 ----
> arch/powerpc/kernel/traps.c | 5 -----
> arch/riscv/kernel/traps.c | 5 -----
> arch/um/kernel/trap.c | 4 ----
> init/main.c | 2 ++
> 12 files changed, 2 insertions(+), 60 deletions(-)
>
> diff --git a/init/main.c b/init/main.c
> index 53b278845b88..4bdbe2928530 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -790,6 +790,8 @@ static inline void initcall_debug_enable(void)
> }
> #endif
>
> +void __init __weak trap_init(void) { }
> +
I think in a C file we don't try to save space as much as in a header file.
I would prefer something like:
void __init __weak trap_init(void)
{
}
> /* Report memory auto-initialization states for this boot. */
> static void __init report_meminit(void)
> {
>
next prev parent reply other threads:[~2021-04-14 9:10 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-14 8:58 [PATCH] init: consolidate trap_init() Jisheng Zhang
2021-04-14 9:10 ` Christophe Leroy [this message]
2021-04-14 9:27 ` Jisheng Zhang
2021-04-14 9:38 ` Jisheng Zhang
2021-04-14 10:00 ` [PATCH v2] " Jisheng Zhang
2021-08-22 19:48 ` Helge Deller
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