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SubjectRe: [PATCH 2/2] x86/boot/KASLR: Restrict kernel to be randomized in mirror regions if existed
Hi Baoquan,

[auto build test WARNING on tip/auto-latest]
[also build test WARNING on next-20170615]
[cannot apply to tip/x86/core v4.12-rc5]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Baoquan-He/x86-boot-KASLR-Restrict-kernel-to-be-randomized-in-mirror-regions-if-existed/20170615-204125
config: i386-defconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

All warnings (new ones prefixed by >>):

arch/x86/boot/compressed/kaslr.c: In function 'process_efi_entry':
>> arch/x86/boot/compressed/kaslr.c:604:24: warning: 'return' with a value, in function returning void
return -EINVAL;
^
arch/x86/boot/compressed/kaslr.c:566:13: note: declared here
static void process_efi_entry(unsigned long minimum, unsigned long image_size)
^~~~~~~~~~~~~~~~~

vim +/return +604 arch/x86/boot/compressed/kaslr.c

588
589 /*
590 * Mirrored regions are meaningful only if "kernelcore=mirror"
591 * specified.
592 */
593 str = strstr(cmdline, "kernelcore=");
594 if (!str)
595 return;
596 str += strlen("kernelcore=");
597 if (strncmp(str, "mirror", 6))
598 return;
599
600 #ifdef CONFIG_X86_32
601 /* Can't handle data above 4GB at this time */
602 if (e->efi_memmap_hi) {
603 warn("Memory map is above 4GB, disabling EFI.\n");
> 604 return -EINVAL;
605 }
606 pmap = e->efi_memmap;
607 #else
608 pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32));
609 #endif
610
611 nr_desc = e->efi_memmap_size / e->efi_memdesc_size;
612 for (i = 0; i < nr_desc; i++) {

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[unhandled content-type:application/gzip]
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