From c5eac1f5326b0b67e50ad5d560d7e68e6c95ef14 Mon Sep 17 00:00:00 2001 From: Geert Uytterhoeven Date: Wed, 22 May 2019 10:15:35 +0200 Subject: [PATCH] MIPS: TXx9: Fix boot crash in free_initmem() On rbtx4927: BUG: Bad page state in process swapper pfn:00001 page:804b7820 refcount:0 mapcount:-128 mapping:00000000 index:0x1 flags: 0x0() raw: 00000000 00000100 00000200 00000000 00000001 00000000 ffffff7f 00000000 page dumped because: nonzero mapcount Modules linked in: CPU: 0 PID: 1 Comm: swapper Not tainted 5.2.0-rc1-rbtx4927-00468-g3c05ea3d4077b756 #141 Stack : 00000000 10008400 8040dc4c 87c1b974 8044af63 8040dc4c 00000001 804a3490 00000001 81000000 0030f231 80148558 00000003 10008400 87c1dd80 3d0f9a2c 00000000 00000000 804b0000 00000000 00000007 00000000 00000081 00000000 62722d31 00000080 804b0000 39347874 00000000 804b7820 8040ce18 81000010 00000001 00000007 00000001 81000000 00000018 8021de24 00000000 804a0000 ... Call Trace: [<8010adec>] show_stack+0x74/0x104 [<801a5e44>] bad_page+0x130/0x138 [<801a654c>] free_pcppages_bulk+0x17c/0x3b0 [<801a789c>] free_unref_page+0x40/0x68 [<801120f4>] free_init_pages+0xec/0x104 [<803bdde8>] free_initmem+0x10/0x58 [<803bdb8c>] kernel_init+0x20/0x100 [<801057c8>] ret_from_kernel_thread+0x14/0x1c As of commit b93ddc4f9156205e ("mips: Reserve memory for the kernel image resources"), bootmem_init() no longer reserves the memory below the kernel, while prom_free_prom_memory() still frees it. Fix this by reverting commit b6263ff2d6e58cc2 ("MIPS: TXx9: Implement prom_free_prom_memory"). Suggested-by: Serge Semin Fixes: b93ddc4f9156205e ("mips: Reserve memory for the kernel image resources") Signed-off-by: Geert Uytterhoeven Reviewed-by: Atsushi Nemoto Signed-off-by: Paul Burton Cc: Ralf Baechle Cc: James Hogan Cc: Mike Rapoport Cc: Maciej W . Rozycki Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org --- arch/mips/txx9/generic/setup.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/arch/mips/txx9/generic/setup.c b/arch/mips/txx9/generic/setup.c index 46537c2ca86a..6d0fd0e055b4 100644 --- a/arch/mips/txx9/generic/setup.c +++ b/arch/mips/txx9/generic/setup.c @@ -33,7 +33,6 @@ #include #include #include -#include #include #include #include @@ -343,11 +342,6 @@ void __init prom_init(void) void __init prom_free_prom_memory(void) { - unsigned long saddr = PAGE_SIZE; - unsigned long eaddr = __pa_symbol(&_text); - - if (saddr < eaddr) - free_init_pages("prom memory", saddr, eaddr); } const char *get_system_type(void)