From: Dave Young Date: Fri, 20 Apr 2018 21:56:10 +0000 (-0700) Subject: kexec_file: do not add extra alignment to efi memmap X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=a841aa83dff0af75c88aa846ba610a8af4c5ee21;p=openwrt%2Fstaging%2Fblogic.git kexec_file: do not add extra alignment to efi memmap Chun-Yi reported a kernel warning message below: WARNING: CPU: 0 PID: 0 at ../mm/early_ioremap.c:182 early_iounmap+0x4f/0x12c() early_iounmap(ffffffffff200180, 00000118) [0] size not consistent 00000120 The problem is x86 kexec_file_load adds extra alignment to the efi memmap: in bzImage64_load(): efi_map_sz = efi_get_runtime_map_size(); efi_map_sz = ALIGN(efi_map_sz, 16); And __efi_memmap_init maps with the size including the alignment bytes but efi_memmap_unmap use nr_maps * desc_size which does not include the extra bytes. The alignment in kexec code is only needed for the kexec buffer internal use Actually kexec should pass exact size of the efi memmap to 2nd kernel. Link: http://lkml.kernel.org/r/20180417083600.GA1972@dhcp-128-65.nay.redhat.com Signed-off-by: Dave Young Reported-by: joeyli Tested-by: Randy Wright Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c index 3182908b7e6c..7326078eaa7a 100644 --- a/arch/x86/kernel/kexec-bzimage64.c +++ b/arch/x86/kernel/kexec-bzimage64.c @@ -398,11 +398,10 @@ static void *bzImage64_load(struct kimage *image, char *kernel, * little bit simple */ efi_map_sz = efi_get_runtime_map_size(); - efi_map_sz = ALIGN(efi_map_sz, 16); params_cmdline_sz = sizeof(struct boot_params) + cmdline_len + MAX_ELFCOREHDR_STR_LEN; params_cmdline_sz = ALIGN(params_cmdline_sz, 16); - kbuf.bufsz = params_cmdline_sz + efi_map_sz + + kbuf.bufsz = params_cmdline_sz + ALIGN(efi_map_sz, 16) + sizeof(struct setup_data) + sizeof(struct efi_setup_data); @@ -410,7 +409,7 @@ static void *bzImage64_load(struct kimage *image, char *kernel, if (!params) return ERR_PTR(-ENOMEM); efi_map_offset = params_cmdline_sz; - efi_setup_data_offset = efi_map_offset + efi_map_sz; + efi_setup_data_offset = efi_map_offset + ALIGN(efi_map_sz, 16); /* Copy setup header onto bootparams. Documentation/x86/boot.txt */ setup_header_size = 0x0202 + kernel[0x0201] - setup_hdr_offset;