From: Richard Weinberger Date: Sun, 12 Jun 2016 19:56:42 +0000 (+0200) Subject: um: Setup physical memory in setup_arch() X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b63236972e1344b247750451e2be0a06cd125f21;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git um: Setup physical memory in setup_arch() Currently UML sets up physical memory very early, long before setup_arch() was called by the kernel main function. This can cause problems when code paths in UML's memory setup code assume that the kernel is already running. i.e. when kmemleak is enabled it will evaluate current() in free_bootmem(). That early current() is undefined and UML explodes. Solve the problem by setting up physical memory in setup_arch(), at this stage the kernel has materialized and basic infrastructure such as current() works. Signed-off-by: Richard Weinberger --- diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c index 16630e75f056..e8175a8aa22c 100644 --- a/arch/um/kernel/um_arch.c +++ b/arch/um/kernel/um_arch.c @@ -319,9 +319,6 @@ int __init linux_main(int argc, char **argv) start_vm = VMALLOC_START; - setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); - mem_total_pages(physmem_size, iomem_size, highmem); - virtmem_size = physmem_size; stack = (unsigned long) argv; stack &= ~(1024 * 1024 - 1); @@ -334,7 +331,6 @@ int __init linux_main(int argc, char **argv) printf("Kernel virtual memory size shrunk to %lu bytes\n", virtmem_size); - stack_protections((unsigned long) &init_thread_info); os_flush_stdout(); return start_uml(); @@ -342,6 +338,10 @@ int __init linux_main(int argc, char **argv) void __init setup_arch(char **cmdline_p) { + stack_protections((unsigned long) &init_thread_info); + setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); + mem_total_pages(physmem_size, iomem_size, highmem); + paging_init(); strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); *cmdline_p = command_line;