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Date: Mon, 7 Oct 2013 10:43:57 +0100
From: James Hogan <james.hogan@...tec.com>
To: Guenter Roeck <linux@...ck-us.net>,
Rob Herring <rob.herring@...xeda.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
<linux-next@...r.kernel.org>, <linux-metag@...r.kernel.org>
Subject: Re: Commit f26150004 (metag: use common of_flat_dt_match_machine)
causes metag build failures in linux-next
On 06/10/13 19:26, Guenter Roeck wrote:
> arch/metag/kernel/devtree.c: In function 'setup_machine_fdt':
> arch/metag/kernel/devtree.c:52: error: 'arch_get_next_mach' undeclared
> (first use in this function)
> arch/metag/kernel/devtree.c:52: error: (Each undeclared identifier is
> reported only once
> arch/metag/kernel/devtree.c:52: error: for each function it appears in.)
> arch/metag/kernel/devtree.c:52: warning: assignment discards qualifiers
> from pointer target type
> make[1]: *** [arch/metag/kernel/devtree.o] Error 1
>
> Not surprising, since arch_get_next_mach() is not defined for metag.
>
> Guenter
Thanks for reporting Guenter (and taking the time to set up auto-building
of different arches - we have a metag buildbot but it hasn't been
tracking the temporary linux-next URL).
Rob, sorry I didn't get around to testing your revised patchset until
now. Please apply something like the patch below (preferably as a fixup)
for f261500 (metag: use common of_flat_dt_match_machine).
This will cause a rebase conflict in "metag: move setup_machine_fdt
declaration from prom.h" since I added const to setup_machine_fdt()'s
return pointer, so that const needs adding to setup.h too.
Does that sound okay?
Thanks
James
>From 821871cba80e00e8d42a38deb8ea2505481e9f1d Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@...tec.com>
Date: Mon, 7 Oct 2013 10:11:23 +0100
Subject: [PATCH FIXUP] metag: fix build error converting to
of_flat_dt_match_machine
Fix the following build error and warning due to commit f261500 (metag:
use common of_flat_dt_match_machine):
arch/metag/kernel/devtree.c: In function 'setup_machine_fdt':
arch/metag/kernel/devtree.c:52: error: 'arch_get_next_mach' undeclared (first use in this function)
arch/metag/kernel/devtree.c:52: error: (Each undeclared identifier is reported only once
arch/metag/kernel/devtree.c:52: error: for each function it appears in.)
arch/metag/kernel/devtree.c:52: warning: assignment discards qualifiers from pointer target type
make[1]: *** [arch/metag/kernel/devtree.o] Error 1
The arch_get_next_mach() function was missing, and there was a const
mismatch which I've pushed out to the global machine_desc pointer. Also
fix a little broken indentation (due presumably to the multiline
comment) and added back a pr_info of the name of the machine which the
kernel is using, as that's often useful to tell if it's using a more
generic machine than it should be.
Reported-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: James Hogan <james.hogan@...tec.com>
---
arch/metag/include/asm/mach/arch.h | 2 +-
arch/metag/include/asm/prom.h | 2 +-
arch/metag/kernel/devtree.c | 20 +++++++++++++++++---
arch/metag/kernel/setup.c | 2 +-
4 files changed, 20 insertions(+), 6 deletions(-)
diff --git a/arch/metag/include/asm/mach/arch.h b/arch/metag/include/asm/mach/arch.h
index 12c5664..433f946 100644
--- a/arch/metag/include/asm/mach/arch.h
+++ b/arch/metag/include/asm/mach/arch.h
@@ -53,7 +53,7 @@ struct machine_desc {
/*
* Current machine - only accessible during boot.
*/
-extern struct machine_desc *machine_desc;
+extern const struct machine_desc *machine_desc;
/*
* Machine type table - also only accessible during boot
diff --git a/arch/metag/include/asm/prom.h b/arch/metag/include/asm/prom.h
index d2aa35d..9f67cbf 100644
--- a/arch/metag/include/asm/prom.h
+++ b/arch/metag/include/asm/prom.h
@@ -17,7 +17,7 @@
#include <asm/setup.h>
#define HAVE_ARCH_DEVTREE_FIXUPS
-extern struct machine_desc *setup_machine_fdt(void *dt);
+extern const struct machine_desc *setup_machine_fdt(void *dt);
extern void copy_fdt(void);
#endif /* __ASM_METAG_PROM_H */
diff --git a/arch/metag/kernel/devtree.c b/arch/metag/kernel/devtree.c
index bf9df90..18dd7ae 100644
--- a/arch/metag/kernel/devtree.c
+++ b/arch/metag/kernel/devtree.c
@@ -34,6 +34,19 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
return alloc_bootmem_align(size, align);
}
+static const void * __init arch_get_next_mach(const char *const **match)
+{
+ static const struct machine_desc *mdesc = __arch_info_begin;
+ const struct machine_desc *m = mdesc;
+
+ if (m >= __arch_info_end)
+ return NULL;
+
+ mdesc++;
+ *match = m->dt_compat;
+ return m;
+}
+
/**
* setup_machine_fdt - Machine setup when an dtb was passed to the kernel
* @dt: virtual address pointer to dt blob
@@ -41,9 +54,9 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
* If a dtb was passed to the kernel, then use it to choose the correct
* machine_desc and to setup the system.
*/
- struct machine_desc * __init setup_machine_fdt(void *dt)
- {
- struct machine_desc *mdesc;
+const struct machine_desc * __init setup_machine_fdt(void *dt)
+{
+ const struct machine_desc *mdesc;
/* check device tree validity */
if (!early_init_dt_scan(dt))
@@ -52,6 +65,7 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
mdesc = of_flat_dt_match_machine(NULL, arch_get_next_mach);
if (!mdesc)
dump_machine_table(); /* does not return */
+ pr_info("Machine name: %s\n", mdesc->name);
return mdesc;
}
diff --git a/arch/metag/kernel/setup.c b/arch/metag/kernel/setup.c
index 2c697d3..92cc119 100644
--- a/arch/metag/kernel/setup.c
+++ b/arch/metag/kernel/setup.c
@@ -115,7 +115,7 @@ extern u32 __dtb_start[];
extern struct console dash_console;
#endif
-struct machine_desc *machine_desc __initdata;
+const struct machine_desc *machine_desc __initdata;
/*
* Map a Linux CPU number to a hardware thread ID
--
1.8.1.2
--
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