From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Minfei Huang Subject: [PATCH v3] kexec: Make a pair of map and unmap reserved pages when kdump fails to start Date: Thu, 2 Jul 2015 09:45:52 +0800 Message-Id: <1435801552-1230-1-git-send-email-mnfhuang@gmail.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: 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 --- v2: - replace the "failure" label with "fail_unmap_pages" v1: - reconstruct the patch code --- kernel/kexec.c | 26 ++++++++++++++------------ 1 file changed, 14 insertions(+), 12 deletions(-) diff --git a/kernel/kexec.c b/kernel/kexec.c index 4589899..9cb09d9 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -1291,35 +1291,37 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments, */ kimage_free(xchg(&kexec_crash_image, NULL)); - result = kimage_alloc_init(&image, entry, nr_segments, - segments, flags); - crash_map_reserved_pages(); - } else { - /* Loading another kernel to reboot into. */ - - result = kimage_alloc_init(&image, entry, nr_segments, - segments, flags); } + + result = kimage_alloc_init(&image, entry, nr_segments, + segments, flags); if (result) goto out; + if (flags & KEXEC_ON_CRASH) + crash_map_reserved_pages(); + if (flags & KEXEC_PRESERVE_CONTEXT) image->preserve_context = 1; result = machine_kexec_prepare(image); if (result) - goto out; + goto fail_unmap_pages; for (i = 0; i < nr_segments; i++) { result = kimage_load_segment(image, &image->segment[i]); if (result) - goto out; + goto fail_unmap_pages; } kimage_terminate(image); + +fail_unmap_pages: 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