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authorMike Rapoport2020-06-03 15:57:28 -0700
committerLinus Torvalds2020-06-03 20:09:43 -0700
commit8f4693f0e0f5e9f64d02a300afd12efda5b50f95 (patch)
treebcd80b5d142639f242e78e1b0791d62dece53f55 /arch/csky
parent584cb13dca27be144a54f9e0b0d71f3db61130a2 (diff)
csky: simplify detection of memory zone boundaries
The free_area_init() function only requires the definition of maximal PFN for each of the supported zone rater than calculation of actual zone sizes and the sizes of the holes between the zones. After removal of CONFIG_HAVE_MEMBLOCK_NODE_MAP the free_area_init() is available to all architectures. Using this function instead of free_area_init_node() simplifies the zone detection. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Tested-by: Hoan Tran <hoan@os.amperecomputing.com> [arm64] Cc: Baoquan He <bhe@redhat.com> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Hocko <mhocko@kernel.org> Cc: Michal Simek <monstr@monstr.eu> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200412194859.12663-10-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/csky')
-rw-r--r--arch/csky/kernel/setup.c26
1 files changed, 11 insertions, 15 deletions
diff --git a/arch/csky/kernel/setup.c b/arch/csky/kernel/setup.c
index 819a9a7bf786..0481f4e34538 100644
--- a/arch/csky/kernel/setup.c
+++ b/arch/csky/kernel/setup.c
@@ -26,7 +26,9 @@ struct screen_info screen_info = {
static void __init csky_memblock_init(void)
{
- unsigned long zone_size[MAX_NR_ZONES];
+ unsigned long lowmem_size = PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
+ unsigned long sseg_size = PFN_DOWN(SSEG_SIZE - PHYS_OFFSET_OFFSET);
+ unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
signed long size;
memblock_reserve(__pa(_stext), _end - _stext);
@@ -36,28 +38,22 @@ static void __init csky_memblock_init(void)
memblock_dump_all();
- memset(zone_size, 0, sizeof(zone_size));
-
min_low_pfn = PFN_UP(memblock_start_of_DRAM());
max_low_pfn = max_pfn = PFN_DOWN(memblock_end_of_DRAM());
size = max_pfn - min_low_pfn;
- if (size <= PFN_DOWN(SSEG_SIZE - PHYS_OFFSET_OFFSET))
- zone_size[ZONE_NORMAL] = size;
- else if (size < PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET)) {
- zone_size[ZONE_NORMAL] =
- PFN_DOWN(SSEG_SIZE - PHYS_OFFSET_OFFSET);
- max_low_pfn = min_low_pfn + zone_size[ZONE_NORMAL];
- } else {
- zone_size[ZONE_NORMAL] =
- PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
- max_low_pfn = min_low_pfn + zone_size[ZONE_NORMAL];
+ if (size >= lowmem_size) {
+ max_low_pfn = min_low_pfn + lowmem_size;
write_mmu_msa1(read_mmu_msa0() + SSEG_SIZE);
+ } else if (size > sseg_size) {
+ max_low_pfn = min_low_pfn + sseg_size;
}
+ max_zone_pfn[ZONE_NORMAL] = max_low_pfn;
+
#ifdef CONFIG_HIGHMEM
- zone_size[ZONE_HIGHMEM] = max_pfn - max_low_pfn;
+ max_zone_pfn[ZONE_HIGHMEM] = max_pfn;
highstart_pfn = max_low_pfn;
highend_pfn = max_pfn;
@@ -66,7 +62,7 @@ static void __init csky_memblock_init(void)
dma_contiguous_reserve(0);
- free_area_init_node(0, zone_size, min_low_pfn, NULL);
+ free_area_init(max_zone_pfn);
}
void __init setup_arch(char **cmdline_p)