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Commit 07ea815b authored by Michael Holzheu's avatar Michael Holzheu Committed by Martin Schwidefsky
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[S390] Remove error checking from copy_oldmem_page() 



Currently it can happen that the pre-allocated ELF header contains a wrong
memory map which would result in errors when copying /proc/vmcore.
In order to still get a valid vmcore, we (temporarily) disable the error
checking in copy_oldmem_page(). This will then produce zero pages for those
memory regions.

Signed-off-by: default avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 5f4026f8

arch/s390/kernel/crash_dump.c

+4 −5
Original line number Original line Diff line number Diff line
@@ -31,7 +31,6 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, 
			 size_t csize, unsigned long offset, int userbuf)

			 size_t csize, unsigned long offset, int userbuf)

{

{

	unsigned long src;

	unsigned long src;

	int rc;





	if (!csize)

	if (!csize)

		return 0;

		return 0;
@@ -43,11 +42,11 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, 
		 src < OLDMEM_BASE + OLDMEM_SIZE)

		 src < OLDMEM_BASE + OLDMEM_SIZE)

		src -= OLDMEM_BASE;

		src -= OLDMEM_BASE;

	if (userbuf)

	if (userbuf)

		rc = copy_to_user_real((void __user *) buf, (void *) src,

		copy_to_user_real((void __force __user *) buf, (void *) src,

				  csize);

				  csize);

	else

	else

		rc = memcpy_real(buf, (void *) src, csize);

		memcpy_real(buf, (void *) src, csize);

	return rc < 0 ? rc : csize;

	return csize;

}

}





/*

/*