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Message-ID: <20211105200143.GA1875983@roeck-us.net>
Date: Fri, 5 Nov 2021 13:01:43 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Florian Fainelli <f.fainelli@...il.com>
Cc: linux-mips@...r.kernel.org,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
"Maciej W. Rozycki" <macro@...am.me.uk>,
"maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE"
<bcm-kernel-feedback-list@...adcom.com>,
Mike Rapoport <rppt@...nel.org>,
Yanteng Si <siyanteng@...ngson.cn>,
Serge Semin <fancer.lancer@...il.com>,
David Hildenbrand <david@...hat.com>,
Liam Howlett <liam.howlett@...cle.com>,
Jens Axboe <axboe@...nel.dk>,
Johannes Thumshirn <johannes.thumshirn@....com>,
open list <linux-kernel@...r.kernel.org>,
"moderated list:BROADCOM BCM7XXX ARM ARCHITECTURE"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] MIPS: Allow modules to set board_be_handler
On Fri, Nov 05, 2021 at 10:30:47AM -0700, Florian Fainelli wrote:
> After making the brcmstb_gisb driver modular with 707a4cdf86e5 ("bus:
> brcmstb_gisb: Allow building as module") Guenter reported that mips
> allmodconfig failed to link because board_be_handler was referenced.
>
> Thomas indicated that if we were to continue making the brcmstb_gisb
> driver modular for MIPS we would need to introduce a function that
> allows setting the board_be_handler and export that function towards
> modules.
>
> This is what is being done here: board_be_handler is made static and is
> now settable with a mips_set_be_handler() function which is exported.
>
> Reported-by: Guenter Roeck <linux@...ck-us.net>
> Suggested-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Fixes: 707a4cdf86e5 ("bus: brcmstb_gisb: Allow building as module")
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Tested-by: Guenter Roeck <linux@...ck-us.net>
> ---
> arch/mips/dec/setup.c | 6 +++---
> arch/mips/include/asm/traps.h | 2 +-
> arch/mips/kernel/traps.c | 8 +++++++-
> arch/mips/sgi-ip22/ip22-berr.c | 2 +-
> arch/mips/sgi-ip22/ip28-berr.c | 2 +-
> arch/mips/sgi-ip27/ip27-berr.c | 2 +-
> arch/mips/sgi-ip32/ip32-berr.c | 2 +-
> arch/mips/sibyte/swarm/setup.c | 2 +-
> arch/mips/txx9/generic/setup_tx4927.c | 2 +-
> arch/mips/txx9/generic/setup_tx4938.c | 2 +-
> arch/mips/txx9/generic/setup_tx4939.c | 2 +-
> drivers/bus/brcmstb_gisb.c | 2 +-
> 12 files changed, 20 insertions(+), 14 deletions(-)
>
> diff --git a/arch/mips/dec/setup.c b/arch/mips/dec/setup.c
> index eaad0ed4b523..a8a30bb1dee8 100644
> --- a/arch/mips/dec/setup.c
> +++ b/arch/mips/dec/setup.c
> @@ -117,21 +117,21 @@ static void __init dec_be_init(void)
> {
> switch (mips_machtype) {
> case MACH_DS23100: /* DS2100/DS3100 Pmin/Pmax */
> - board_be_handler = dec_kn01_be_handler;
> + mips_set_be_handler(dec_kn01_be_handler);
> busirq_handler = dec_kn01_be_interrupt;
> busirq_flags |= IRQF_SHARED;
> dec_kn01_be_init();
> break;
> case MACH_DS5000_1XX: /* DS5000/1xx 3min */
> case MACH_DS5000_XX: /* DS5000/xx Maxine */
> - board_be_handler = dec_kn02xa_be_handler;
> + mips_set_be_handler(dec_kn02xa_be_handler);
> busirq_handler = dec_kn02xa_be_interrupt;
> dec_kn02xa_be_init();
> break;
> case MACH_DS5000_200: /* DS5000/200 3max */
> case MACH_DS5000_2X0: /* DS5000/240 3max+ */
> case MACH_DS5900: /* DS5900 bigmax */
> - board_be_handler = dec_ecc_be_handler;
> + mips_set_be_handler(dec_ecc_be_handler);
> busirq_handler = dec_ecc_be_interrupt;
> dec_ecc_be_init();
> break;
> diff --git a/arch/mips/include/asm/traps.h b/arch/mips/include/asm/traps.h
> index b710e76c9c65..15cde638b407 100644
> --- a/arch/mips/include/asm/traps.h
> +++ b/arch/mips/include/asm/traps.h
> @@ -15,7 +15,7 @@
> #define MIPS_BE_FATAL 2 /* treat as an unrecoverable error */
>
> extern void (*board_be_init)(void);
> -extern int (*board_be_handler)(struct pt_regs *regs, int is_fixup);
> +void mips_set_be_handler(int (*handler)(struct pt_regs *reg, int is_fixup));
>
> extern void (*board_nmi_handler_setup)(void);
> extern void (*board_ejtag_handler_setup)(void);
> diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
> index 6f07362de5ce..d26b0fb8ea06 100644
> --- a/arch/mips/kernel/traps.c
> +++ b/arch/mips/kernel/traps.c
> @@ -103,13 +103,19 @@ extern asmlinkage void handle_reserved(void);
> extern void tlb_do_page_fault_0(void);
>
> void (*board_be_init)(void);
> -int (*board_be_handler)(struct pt_regs *regs, int is_fixup);
> +static int (*board_be_handler)(struct pt_regs *regs, int is_fixup);
> void (*board_nmi_handler_setup)(void);
> void (*board_ejtag_handler_setup)(void);
> void (*board_bind_eic_interrupt)(int irq, int regset);
> void (*board_ebase_setup)(void);
> void(*board_cache_error_setup)(void);
>
> +void mips_set_be_handler(int (*handler)(struct pt_regs *regs, int is_fixup))
> +{
> + board_be_handler = handler;
> +}
> +EXPORT_SYMBOL_GPL(mips_set_be_handler);
> +
> static void show_raw_backtrace(unsigned long reg29, const char *loglvl,
> bool user)
> {
> diff --git a/arch/mips/sgi-ip22/ip22-berr.c b/arch/mips/sgi-ip22/ip22-berr.c
> index dc0110a607a5..afe8a61078e4 100644
> --- a/arch/mips/sgi-ip22/ip22-berr.c
> +++ b/arch/mips/sgi-ip22/ip22-berr.c
> @@ -112,5 +112,5 @@ static int ip22_be_handler(struct pt_regs *regs, int is_fixup)
>
> void __init ip22_be_init(void)
> {
> - board_be_handler = ip22_be_handler;
> + mips_set_be_handler(ip22_be_handler);
> }
> diff --git a/arch/mips/sgi-ip22/ip28-berr.c b/arch/mips/sgi-ip22/ip28-berr.c
> index c61362d9ea95..16ca470deb80 100644
> --- a/arch/mips/sgi-ip22/ip28-berr.c
> +++ b/arch/mips/sgi-ip22/ip28-berr.c
> @@ -468,7 +468,7 @@ static int ip28_be_handler(struct pt_regs *regs, int is_fixup)
>
> void __init ip22_be_init(void)
> {
> - board_be_handler = ip28_be_handler;
> + mips_set_be_handler(ip28_be_handler);
> }
>
> int ip28_show_be_info(struct seq_file *m)
> diff --git a/arch/mips/sgi-ip27/ip27-berr.c b/arch/mips/sgi-ip27/ip27-berr.c
> index 5a38ae6bdfa9..923a63a51cda 100644
> --- a/arch/mips/sgi-ip27/ip27-berr.c
> +++ b/arch/mips/sgi-ip27/ip27-berr.c
> @@ -85,7 +85,7 @@ void __init ip27_be_init(void)
> int cpu = LOCAL_HUB_L(PI_CPU_NUM);
> int cpuoff = cpu << 8;
>
> - board_be_handler = ip27_be_handler;
> + mips_set_be_handler(ip27_be_handler);
>
> LOCAL_HUB_S(PI_ERR_INT_PEND,
> cpu ? PI_ERR_CLEAR_ALL_B : PI_ERR_CLEAR_ALL_A);
> diff --git a/arch/mips/sgi-ip32/ip32-berr.c b/arch/mips/sgi-ip32/ip32-berr.c
> index c860f95ab7ed..478b63b4c808 100644
> --- a/arch/mips/sgi-ip32/ip32-berr.c
> +++ b/arch/mips/sgi-ip32/ip32-berr.c
> @@ -34,5 +34,5 @@ static int ip32_be_handler(struct pt_regs *regs, int is_fixup)
>
> void __init ip32_be_init(void)
> {
> - board_be_handler = ip32_be_handler;
> + mips_set_be_handler(ip32_be_handler);
> }
> diff --git a/arch/mips/sibyte/swarm/setup.c b/arch/mips/sibyte/swarm/setup.c
> index f07b15dd1c1a..72a31eeeebba 100644
> --- a/arch/mips/sibyte/swarm/setup.c
> +++ b/arch/mips/sibyte/swarm/setup.c
> @@ -122,7 +122,7 @@ void __init plat_mem_setup(void)
> #error invalid SiByte board configuration
> #endif
>
> - board_be_handler = swarm_be_handler;
> + mips_set_be_handler(swarm_be_handler);
>
> if (xicor_probe())
> swarm_rtc_type = RTC_XICOR;
> diff --git a/arch/mips/txx9/generic/setup_tx4927.c b/arch/mips/txx9/generic/setup_tx4927.c
> index 46e9c4101386..63f9725b2eb0 100644
> --- a/arch/mips/txx9/generic/setup_tx4927.c
> +++ b/arch/mips/txx9/generic/setup_tx4927.c
> @@ -80,7 +80,7 @@ static int tx4927_be_handler(struct pt_regs *regs, int is_fixup)
> }
> static void __init tx4927_be_init(void)
> {
> - board_be_handler = tx4927_be_handler;
> + mips_set_be_handler(tx4927_be_handler);
> }
>
> static struct resource tx4927_sdram_resource[4];
> diff --git a/arch/mips/txx9/generic/setup_tx4938.c b/arch/mips/txx9/generic/setup_tx4938.c
> index 17395d5d15ca..ba646548c5f6 100644
> --- a/arch/mips/txx9/generic/setup_tx4938.c
> +++ b/arch/mips/txx9/generic/setup_tx4938.c
> @@ -82,7 +82,7 @@ static int tx4938_be_handler(struct pt_regs *regs, int is_fixup)
> }
> static void __init tx4938_be_init(void)
> {
> - board_be_handler = tx4938_be_handler;
> + mips_set_be_handler(tx4938_be_handler);
> }
>
> static struct resource tx4938_sdram_resource[4];
> diff --git a/arch/mips/txx9/generic/setup_tx4939.c b/arch/mips/txx9/generic/setup_tx4939.c
> index bf8a3cdababf..f5f59b7401a3 100644
> --- a/arch/mips/txx9/generic/setup_tx4939.c
> +++ b/arch/mips/txx9/generic/setup_tx4939.c
> @@ -86,7 +86,7 @@ static int tx4939_be_handler(struct pt_regs *regs, int is_fixup)
> }
> static void __init tx4939_be_init(void)
> {
> - board_be_handler = tx4939_be_handler;
> + mips_set_be_handler(tx4939_be_handler);
> }
>
> static struct resource tx4939_sdram_resource[4];
> diff --git a/drivers/bus/brcmstb_gisb.c b/drivers/bus/brcmstb_gisb.c
> index 4c2f7d61cb9b..183d5cc37d42 100644
> --- a/drivers/bus/brcmstb_gisb.c
> +++ b/drivers/bus/brcmstb_gisb.c
> @@ -485,7 +485,7 @@ static int __init brcmstb_gisb_arb_probe(struct platform_device *pdev)
> list_add_tail(&gdev->next, &brcmstb_gisb_arb_device_list);
>
> #ifdef CONFIG_MIPS
> - board_be_handler = brcmstb_bus_error_handler;
> + mips_set_be_handler(brcmstb_bus_error_handler);
> #endif
>
> if (list_is_singular(&brcmstb_gisb_arb_device_list)) {
> --
> 2.25.1
>
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