linux-kernel - [PATCH 11/13] vmcore: count holes generated by round-up operation for vmcore size

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Message-ID: <20130214101243.22466.82507.stgit@localhost6.localdomain6>
Date:	Thu, 14 Feb 2013 19:12:43 +0900
From:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
To:	ebiederm@...ssion.com, vgoyal@...hat.com, cpw@....com,
	kumagai-atsushi@....nes.nec.co.jp, lisa.mitchell@...com
Cc:	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 11/13] vmcore: count holes generated by round-up operation for
 vmcore size

The previous patch offsets of each vmcore objects by round-up
operation. vmcore size must count the holes.

Signed-off-by: HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
---

 fs/proc/vmcore.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index afedb5f..2968e5a 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -196,7 +196,7 @@ static struct vmcore* __init get_new_element(void)
 	return kzalloc(sizeof(struct vmcore), GFP_KERNEL);
 }
 
-static u64 __init get_vmcore_size_elf64(char *elfptr)
+static u64 __init get_vmcore_size_elf64(char *elfptr, size_t elfsz)
 {
 	int i;
 	u64 size;
@@ -205,9 +205,9 @@ static u64 __init get_vmcore_size_elf64(char *elfptr)
 
 	ehdr_ptr = (Elf64_Ehdr *)elfptr;
 	phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr));
-	size = sizeof(Elf64_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr));
+	size = elfsz;
 	for (i = 0; i < ehdr_ptr->e_phnum; i++) {
-		size += phdr_ptr->p_memsz;
+		size += roundup(phdr_ptr->p_memsz, PAGE_SIZE);
 		phdr_ptr++;
 	}
 	return size;
@@ -699,7 +699,7 @@ static int __init parse_crash_elf_headers(void)
 			return rc;
 
 		/* Determine vmcore size. */
-		vmcore_size = get_vmcore_size_elf64(elfcorebuf);
+		vmcore_size = get_vmcore_size_elf64(elfcorebuf, elfcorebuf_sz);
 	} else if (e_ident[EI_CLASS] == ELFCLASS32) {
 		rc = parse_crash_elf32_headers();
 		if (rc)

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