From: Mike Rapoport <rppt@xxxxxxxxxxxxx> Subject: 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(). Link: http://lkml.kernel.org/r/20200412194859.12663-21-rppt@xxxxxxxxxx Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx> Tested-by: Hoan Tran <hoan@xxxxxxxxxxxxxxxxxxxxxx> [arm64] Cc: Baoquan He <bhe@xxxxxxxxxx> Cc: Brian Cain <bcain@xxxxxxxxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: "David S. Miller" <davem@xxxxxxxxxxxxx> Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> Cc: Greentime Hu <green.hu@xxxxxxxxx> Cc: Greg Ungerer <gerg@xxxxxxxxxxxxxx> Cc: Guan Xuetao <gxt@xxxxxxxxxx> Cc: Guo Ren <guoren@xxxxxxxxxx> Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx> Cc: Helge Deller <deller@xxxxxx> Cc: "James E.J. Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> Cc: Jonathan Corbet <corbet@xxxxxxx> Cc: Ley Foon Tan <ley.foon.tan@xxxxxxxxx> Cc: Mark Salter <msalter@xxxxxxxxxx> Cc: Matt Turner <mattst88@xxxxxxxxx> Cc: Max Filippov <jcmvbkbc@xxxxxxxxx> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Cc: Michal Simek <monstr@xxxxxxxxx> Cc: Nick Hu <nickhu@xxxxxxxxxxxxx> Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx> Cc: Richard Weinberger <richard@xxxxxx> Cc: Rich Felker <dalias@xxxxxxxx> Cc: Russell King <linux@xxxxxxxxxxxxxxx> Cc: Stafford Horne <shorne@xxxxxxxxx> Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx> Cc: Tony Luck <tony.luck@xxxxxxxxx> Cc: Vineet Gupta <vgupta@xxxxxxxxxxxx> Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/page_alloc.c | 20 +------------------- 1 file changed, 1 insertion(+), 19 deletions(-) --- a/mm/page_alloc.c~mm-simplify-find_min_pfn_with_active_regions +++ a/mm/page_alloc.c @@ -7066,24 +7066,6 @@ unsigned long __init node_map_pfn_alignm return ~accl_mask + 1; } -/* Find the lowest pfn for a node */ -static unsigned long __init find_min_pfn_for_node(int nid) -{ - unsigned long min_pfn = ULONG_MAX; - unsigned long start_pfn; - int i; - - for_each_mem_pfn_range(i, nid, &start_pfn, NULL, NULL) - min_pfn = min(min_pfn, start_pfn); - - if (min_pfn == ULONG_MAX) { - pr_warn("Could not find start_pfn for node %d\n", nid); - return 0; - } - - return min_pfn; -} - /** * find_min_pfn_with_active_regions - Find the minimum PFN registered * @@ -7092,7 +7074,7 @@ static unsigned long __init find_min_pfn */ unsigned long __init find_min_pfn_with_active_regions(void) { - return find_min_pfn_for_node(MAX_NUMNODES); + return PHYS_PFN(memblock_start_of_DRAM()); } /* _
