From: Pratyush Anand To: ats-kumagai@wm.jp.nec.com Subject: [PATCH Makedumpfile 1/4] x86_64: Calculate page_offset from pt_load Date: Mon, 24 Oct 2016 22:18:43 +0530 Cc: Pratyush Anand , dyoung@redhat.com, kexec@lists.infradead.org, bhe@redhat.com MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=utf-8 page_offset can always be calculated as 'virtual - physical' for a direct mapping area on x86. Therefore, remove the version dependent calculation and use this method. Signed-off-by: Pratyush Anand --- arch/x86_64.c | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-) diff --git a/arch/x86_64.c b/arch/x86_64.c index ddf7be6bc57b..a96fd8ae00a1 100644 --- a/makedumpfile-1.6.0/arch/x86_64.c +++ b/makedumpfile-1.6.0/arch/x86_64.c @@ -44,6 +44,24 @@ get_xen_p2m_mfn(void) return NOT_FOUND_LONG_VALUE; } +static int +get_page_offset_x86_64(void) +{ + int i; + unsigned long long phys_start; + unsigned long long virt_start; + + for (i = 0; get_pt_load(i, &phys_start, NULL, &virt_start, NULL); i++) { + if (virt_start >= __START_KERNEL_map) { + info->page_offset = virt_start - phys_start; + return TRUE; + } + } + + ERRMSG("Can't get any pt_load to calculate page offset.\n"); + return FALSE; +} + int get_phys_base_x86_64(void) { @@ -159,10 +177,8 @@ get_versiondep_info_x86_64(void) else info->max_physmem_bits = _MAX_PHYSMEM_BITS_2_6_31; - if (info->kernel_version < KERNEL_VERSION(2, 6, 27)) - info->page_offset = __PAGE_OFFSET_ORIG; - else - info->page_offset = __PAGE_OFFSET_2_6_27; + if (!get_page_offset_x86_64()) + return FALSE; if (info->kernel_version < KERNEL_VERSION(2, 6, 31)) { info->vmalloc_start = VMALLOC_START_ORIG; -- 2.7.4 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec