From c4082f36fa3eeb5d4fadc50241b6e3a388561f80 Mon Sep 17 00:00:00 2001 From: WANG Chao Date: Mon, 7 Apr 2014 15:38:51 -0700 Subject: [PATCH] vmcore: continue vmcore initialization if PT_NOTE is found empty Currently when an empty PT_NOTE is detected, vmcore initialization fails. It sounds too harsh. Because PT_NOTE could be empty, for example, one offlined a cpu but never restarted kdump service, and after crash, PT_NOTE program header is there but no data contains. It's better to warn about the empty PT_NOTE and continue to initialise vmcore. And ultimately the multiple PT_NOTE are merged into a single one, all empty PT_NOTE are discarded naturally during the merge. So empty PT_NOTE is not visible to user space and vmcore is as good as expected. Signed-off-by: WANG Chao Cc: Vivek Goyal Cc: HATAYAMA Daisuke Cc: Greg Pearson Cc: Baoquan He Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/proc/vmcore.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c index ab852715916d..6a8e785b29da 100644 --- a/fs/proc/vmcore.c +++ b/fs/proc/vmcore.c @@ -484,7 +484,6 @@ static int __init update_note_header_size_elf64(const Elf64_Ehdr *ehdr_ptr) phdr_ptr->p_memsz = real_sz; if (real_sz == 0) { pr_warn("Warning: Zero PT_NOTE entries found\n"); - return -EINVAL; } } @@ -671,7 +670,6 @@ static int __init update_note_header_size_elf32(const Elf32_Ehdr *ehdr_ptr) phdr_ptr->p_memsz = real_sz; if (real_sz == 0) { pr_warn("Warning: Zero PT_NOTE entries found\n"); - return -EINVAL; } } -- 2.11.0