From cbfef9297e3082c296f8d43ca41b1f7f608dbb92 Mon Sep 17 00:00:00 2001 From: Bhupesh Sharma Date: Wed, 6 Sep 2017 17:29:58 +0530 Subject: [Makedumpfile PATCH v2] book3s/ppc64: Lower the max real address to 53 bits for kernels >= v4.11 Kernel commit 2f18d533757da3899f4bedab0b2c051b080079dc lowered the max real address on ppc64 to 53 bits. Make similar changes in makedumpfile (on basis of the underlying kernel version), without which the makedumpfile will fail to create a dumpfile and instead throw a SEGV fault as shown below on kernels >= v4.11: # makedumpfile --split -d 31 -x vmlinux vmcore dumpfile_{1,2,3} 2>&1 The kernel version is not supported. The makedumpfile operation may be incomplete. [ 1196.252094] makedumpfile[2367]: unhandled signal 11 at 00000100f7011ca8 nip 000000001001eecc lr 000000001001f3c0 code 30001 Segmentation fault Signed-off-by: Bhupesh Sharma --- Changes since v1: - As per Atsushi's comments introduced macros for 4_11 directly in v2 and use them in arch/ppc64.c arch/ppc64.c | 8 +++++++- makedumpfile.h | 5 +++++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/makedumpfile-1.6.1/arch/ppc64.c b/makedumpfile-1.6.1/arch/ppc64.c index bacac778f73c..2f5a0daa16b2 100644 --- a/makedumpfile-1.6.1/arch/ppc64.c +++ b/makedumpfile-1.6.1/arch/ppc64.c @@ -307,11 +307,17 @@ ppc64_vmalloc_init(void) } info->pte_rpn_mask = PTE_RPN_MASK_DEFAULT; - if (info->kernel_version >= KERNEL_VERSION(4, 6, 0)) { + if ((info->kernel_version >= KERNEL_VERSION(4, 6, 0)) && + (info->kernel_version < KERNEL_VERSION(4, 11, 0))) { info->pte_rpn_mask = PTE_RPN_MASK_L4_4_6; info->pte_rpn_shift = PTE_RPN_SHIFT_L4_4_6; } + if (info->kernel_version >= KERNEL_VERSION(4, 11, 0)) { + info->pte_rpn_mask = PTE_RPN_MASK_L4_4_11; + info->pte_rpn_shift = PTE_RPN_SHIFT_L4_4_11; + } + /* * Compute ptrs per each level */ diff --git a/makedumpfile-1.6.1/makedumpfile.h b/makedumpfile-1.6.1/makedumpfile.h index 7d81bbcf2234..f4ba02d11f09 100644 --- a/makedumpfile-1.6.1/makedumpfile.h +++ b/makedumpfile-1.6.1/makedumpfile.h @@ -692,6 +692,11 @@ unsigned long get_kvbase_arm64(void); #define PUD_MASKED_BITS_4_7 0xc0000000000000ffUL #define PMD_MASKED_BITS_4_7 0xc0000000000000ffUL +#define PTE_RPN_SIZE_L4_4_11 53 +#define PTE_RPN_MASK_L4_4_11 \ + (((1UL << PTE_RPN_SIZE_L4_4_11) - 1) & ~((1UL << info->page_shift) - 1)) +#define PTE_RPN_SHIFT_L4_4_11 info->page_shift + /* * Supported MMU types */ -- 2.7.4