From: Anup Patel <Anup.Patel@wdc.com>
To: Palmer Dabbelt <palmer@sifive.com>, Albert Ou <aou@eecs.berkeley.edu>
Cc: Anup Patel <Anup.Patel@wdc.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Mike Rapoport <rppt@linux.ibm.com>,
Christoph Hellwig <hch@infradead.org>,
Atish Patra <Atish.Patra@wdc.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
"linux-riscv@lists.infradead.org"
<linux-riscv@lists.infradead.org>
Subject: [PATCH v5 1/2] RISC-V: Fix memory reservation in setup_bootmem()
Date: Fri, 7 Jun 2019 06:01:29 +0000 [thread overview]
Message-ID: <20190607060049.29257-2-anup.patel@wdc.com> (raw)
In-Reply-To: <20190607060049.29257-1-anup.patel@wdc.com>
Currently, the setup_bootmem() reserves memory from RAM start to the
kernel end. This prevents us from exploring ways to use the RAM below
(or before) the kernel start hence this patch updates setup_bootmem()
to only reserve memory from the kernel start to the kernel end.
Suggested-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
arch/riscv/mm/init.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 8bf6f9c2d48c..1879501bd156 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -29,6 +29,8 @@ unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
__page_aligned_bss;
EXPORT_SYMBOL(empty_zero_page);
+extern char _start[];
+
static void __init zone_sizes_init(void)
{
unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
@@ -103,18 +105,14 @@ void __init setup_bootmem(void)
{
struct memblock_region *reg;
phys_addr_t mem_size = 0;
+ phys_addr_t vmlinux_end = __pa(&_end);
+ phys_addr_t vmlinux_start = __pa(&_start);
/* Find the memory region containing the kernel */
for_each_memblock(memory, reg) {
- phys_addr_t vmlinux_end = __pa(_end);
phys_addr_t end = reg->base + reg->size;
if (reg->base <= vmlinux_end && vmlinux_end <= end) {
- /*
- * Reserve from the start of the region to the end of
- * the kernel
- */
- memblock_reserve(reg->base, vmlinux_end - reg->base);
mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET);
/*
@@ -128,6 +126,9 @@ void __init setup_bootmem(void)
}
BUG_ON(mem_size == 0);
+ /* Reserve from the start of the kernel to the end of the kernel */
+ memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
+
set_max_mapnr(PFN_DOWN(mem_size));
max_low_pfn = PFN_DOWN(memblock_end_of_DRAM());
@@ -205,7 +206,6 @@ void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
asmlinkage void __init setup_vm(void)
{
- extern char _start;
uintptr_t i;
uintptr_t pa = (uintptr_t) &_start;
pgprot_t prot = __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_EXEC);
--
2.17.1
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next prev parent reply other threads:[~2019-06-07 6:01 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-07 6:01 [PATCH v5 0/2] Two-stagged initial page table setup Anup Patel
2019-06-07 6:01 ` Anup Patel [this message]
2019-06-28 20:59 ` [PATCH v5 1/2] RISC-V: Fix memory reservation in setup_bootmem() Paul Walmsley
2019-06-07 6:01 ` [PATCH v5 2/2] RISC-V: Setup initial page tables in two stages Anup Patel
2019-07-11 0:05 ` Paul Walmsley
2019-08-15 18:57 ` Alistair Francis
2019-08-15 19:07 ` David Abdurachmanov
2019-08-15 20:25 ` Alistair Francis
2019-08-15 20:29 ` Paul Walmsley
2019-08-15 21:32 ` Alistair Francis
2019-08-16 1:05 ` Anup Patel
2019-06-22 4:13 ` [PATCH v5 0/2] Two-stagged initial page table setup Anup Patel
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