linux-kernel - [PATCH 12/12] mips: Enable OF_RESERVED

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Date:   Wed, 24 Apr 2019 01:47:48 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Matt Redfearn <matt.redfearn@...s.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Bogendoerfer <tbogendoerfer@...e.de>,
        Huacai Chen <chenhc@...ote.com>,
        Stefan Agner <stefan@...er.ch>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Juergen Gross <jgross@...e.com>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Serge Semin <fancer.lancer@...il.com>
Subject: [PATCH 12/12] mips: Enable OF_RESERVED_MEM config

Since memblock-patchset was introduced the reserved-memory nodes are
supported being declared in dt-files. So these nodes are actually parsed
during the arch setup procedure when the early_init_fdt_scan_reserved_mem()
method is called. But some of the features like private reserved memory
pools aren't available at the moment, since OF_RESERVED_MEM isn't enabled
for the MIPS platform. Lets fix it by enabling the config.

But due to the arch-specific boot mem_map container utilization we need
to manually call the fdt_init_reserved_mem() method after all the available
and reserved memory has been moved to memblock. The function call performed
before bootmem_init() fails due to the lack of any memblock memory regions
to allocate from at that stage.

Signed-off-by: Serge Semin <fancer.lancer@...il.com>
---
 arch/mips/Kconfig        | 1 +
 arch/mips/kernel/setup.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 4a5f5b0ee9a9..0bf9e89e4023 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2988,6 +2988,7 @@ config USE_OF
 	bool
 	select OF
 	select OF_EARLY_FLATTREE
+	select OF_RESERVED_MEM
 	select IRQ_DOMAIN
 
 config UHI_BOOT
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index fbd216b4e929..ab349d2381c3 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -27,6 +27,7 @@
 #include <linux/dma-contiguous.h>
 #include <linux/decompress/generic.h>
 #include <linux/of_fdt.h>
+#include <linux/of_reserved_mem.h>
 
 #include <asm/addrspace.h>
 #include <asm/bootinfo.h>
@@ -825,6 +826,8 @@ static void __init arch_mem_init(char **cmdline_p)
 	memblock_reserve(__pa_symbol(&__nosave_begin),
 		__pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
 
+	fdt_init_reserved_mem();
+
 	memblock_dump_all();
 
 	early_memtest(PFN_PHYS(min_low_pfn), PFN_PHYS(max_low_pfn));
-- 
2.21.0