mm: simplify find_min_pfn_with_active_regions()
find_min_pfn_with_active_regions() calls find_min_pfn_for_node() with nid parameter set to MAX_NUMNODES. This makes the find_min_pfn_for_node() traverse all memblock memory regions although the first PFN in the system can be easily found with memblock_start_of_DRAM(). Use memblock_start_of_DRAM() in find_min_pfn_with_active_regions() and drop now unused find_min_pfn_for_node(). 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/20200412194859.12663-21-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -7066,24 +7066,6 @@ unsigned long __init node_map_pfn_alignment(void)
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return ~accl_mask + 1;
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}
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/* Find the lowest pfn for a node */
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static unsigned long __init find_min_pfn_for_node(int nid)
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{
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unsigned long min_pfn = ULONG_MAX;
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unsigned long start_pfn;
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int i;
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for_each_mem_pfn_range(i, nid, &start_pfn, NULL, NULL)
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min_pfn = min(min_pfn, start_pfn);
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if (min_pfn == ULONG_MAX) {
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pr_warn("Could not find start_pfn for node %d\n", nid);
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return 0;
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}
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return min_pfn;
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}
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/**
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* find_min_pfn_with_active_regions - Find the minimum PFN registered
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*
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@ -7092,7 +7074,7 @@ static unsigned long __init find_min_pfn_for_node(int nid)
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*/
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unsigned long __init find_min_pfn_with_active_regions(void)
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{
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return find_min_pfn_for_node(MAX_NUMNODES);
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return PHYS_PFN(memblock_start_of_DRAM());
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}
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/*
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