From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Minfei Huang Subject: [PATCH] kexec: Make a pair of reserved pages when kdump fails to start Date: Thu, 25 Jun 2015 11:31:22 +0800 Message-Id: <1435203082-25338-1-git-send-email-mhuang@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-Archive: List-Post: To: ebiederm@xmission.com, vgoyal@redhat.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, linux390@de.ibm.com, holzheu@linux.vnet.ibm.com Cc: linux-s390@vger.kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, Minfei Huang List-ID: From: Minfei Huang For some arch, kexec shall map the reserved pages, then use them, when we try to start the kdump service. Now kexec will never unmap the reserved pages, once it fails to continue starting the kdump service. Make a pair of reserved pages in kdump starting path, whatever kexec fails or not. Signed-off-by: Minfei Huang --- kernel/kexec.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/kernel/kexec.c b/kernel/kexec.c index 7a36fdc..ab32d59 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -1308,19 +1308,23 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments, image->preserve_context = 1; result = machine_kexec_prepare(image); if (result) - goto out; + goto failure; for (i = 0; i < nr_segments; i++) { result = kimage_load_segment(image, &image->segment[i]); if (result) - goto out; + goto failure; } kimage_terminate(image); + +failure: if (flags & KEXEC_ON_CRASH) crash_unmap_reserved_pages(); } - /* Install the new kernel, and Uninstall the old */ - image = xchg(dest_image, image); + + if (result == 0) + /* Install the new kernel, and Uninstall the old */ + image = xchg(dest_image, image); out: mutex_unlock(&kexec_mutex); -- 2.2.2