linux-kernel - Re: [RFC PATCH 03/29] mm: remove CONFIG_HAVE

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Message-Id: <20180919103457.GA20545@rapoport-lnx>
Date:   Wed, 19 Sep 2018 13:34:57 +0300
From:   Mike Rapoport <rppt@...ux.vnet.ibm.com>
To:     Jonathan Cameron <jonathan.cameron@...wei.com>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...hat.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Hocko <mhocko@...e.com>,
        Paul Burton <paul.burton@...s.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tony Luck <tony.luck@...el.com>, linux-ia64@...r.kernel.org,
        linux-mips@...ux-mips.org, linuxppc-dev@...ts.ozlabs.org,
        sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxarm@...wei.com
Subject: Re: [RFC PATCH 03/29] mm: remove CONFIG_HAVE_MEMBLOCK

Hi Jonathan,

On Wed, Sep 19, 2018 at 10:04:49AM +0100, Jonathan Cameron wrote:
> On Wed, 5 Sep 2018 18:59:18 +0300
> Mike Rapoport <rppt@...ux.vnet.ibm.com> wrote:
> 
> > All architecures use memblock for early memory management. There is no need
> > for the CONFIG_HAVE_MEMBLOCK configuration option.
> > 
> > Signed-off-by: Mike Rapoport <rppt@...ux.vnet.ibm.com>
> 
> Hi Mike,
> 
> A minor editing issue in here that is stopping boot on arm64 platforms with latest
> version of the mm tree.

Can you please try the following patch:


>From 079bd5d24a01df3df9500d0a33d89cb9f7da4588 Mon Sep 17 00:00:00 2001
From: Mike Rapoport <rppt@...ux.vnet.ibm.com>
Date: Wed, 19 Sep 2018 13:29:27 +0300
Subject: [PATCH] of/fdt: fixup #ifdefs after removal of HAVE_MEMBLOCK config
 option

The removal of HAVE_MEMBLOCK configuration option, mistakenly dropped the
wrong #endif. This patch restores that #endif and removes the part that
should have been actually removed, starting from #else and up to the
correct #endif

Reported-by: Jonathan Cameron <jonathan.cameron@...wei.com>
Signed-off-by: Mike Rapoport <rppt@...ux.vnet.ibm.com>
---
 drivers/of/fdt.c | 21 +--------------------
 1 file changed, 1 insertion(+), 20 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 48314e9..bb532aa 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -1119,6 +1119,7 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
 #endif
 #ifndef MAX_MEMBLOCK_ADDR
 #define MAX_MEMBLOCK_ADDR	((phys_addr_t)~0)
+#endif
 
 void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
 {
@@ -1175,26 +1176,6 @@ int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
 	return memblock_reserve(base, size);
 }
 
-#else
-void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
-{
-	WARN_ON(1);
-}
-
-int __init __weak early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size)
-{
-	return -ENOSYS;
-}
-
-int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
-					phys_addr_t size, bool nomap)
-{
-	pr_err("Reserved memory not supported, ignoring range %pa - %pa%s\n",
-		  &base, &size, nomap ? " (nomap)" : "");
-	return -ENOSYS;
-}
-#endif
-
 static void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
 {
 	return memblock_alloc(size, align);
-- 
2.7.4

 
> > diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> > index 76c83c1..bd841bb 100644
> > --- a/drivers/of/fdt.c
> > +++ b/drivers/of/fdt.c
> > @@ -1115,13 +1115,11 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
> >  	return 1;
> >  }
> >  
> > -#ifdef CONFIG_HAVE_MEMBLOCK
> >  #ifndef MIN_MEMBLOCK_ADDR
> >  #define MIN_MEMBLOCK_ADDR	__pa(PAGE_OFFSET)
> >  #endif
> >  #ifndef MAX_MEMBLOCK_ADDR
> >  #define MAX_MEMBLOCK_ADDR	((phys_addr_t)~0)
> > -#endif
> 
> This isn't the right #endif. It is matching with the #ifndef MAX_MEMBLOCK_ADDR
> not the intented #ifdef CONFIG_HAVE_MEMBLOCK.
> 
> Now I haven't chased through the exact reason this is causing my acpi
> arm64 system not to boot on the basis it is obviously miss-matched anyway
> and I'm inherently lazy.  It's resulting in stubs replacing the following weak
> functions.
> 
> early_init_dt_add_memory_arch
> (this is defined elsewhere for some architectures but not arm)
> 
> early_init_dt_mark_hotplug_memory_arch
> (there is only one definition of this in the kernel so it doesn't
>  need to be weak or in the header etc).
> 
> early_init_dt_reserve_memory_arch
> (defined on mips but nothing else)
> 
> Taking out the right endif also lets you drop an #else removing some stub
> functions further down in here.
> 
> Nice cleanup in general btw.
> 
> Thanks,
> 
> Jonathan
> >  
> >  void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
> >  {
> 

-- 
Sincerely yours,
Mike.