]> git.karo-electronics.de Git - linux-beck.git/commit
x86/crash: Allocate enough low memory when crashkernel=high
authorJoerg Roedel <jroedel@suse.de>
Wed, 10 Jun 2015 15:49:42 +0000 (17:49 +0200)
committerIngo Molnar <mingo@kernel.org>
Thu, 11 Jun 2015 06:28:39 +0000 (08:28 +0200)
commit94fb9334182284e8e7e4bcb9125c25dc33af19d4
tree2b03ae4cfe2fa10e0370ee635b517492b5b85232
parent186dfc9d69b96a38ec6ec654127dba4432184494
x86/crash: Allocate enough low memory when crashkernel=high

When the crash kernel is loaded above 4GiB in memory, the
first kernel allocates only 72MiB of low-memory for the DMA
requirements of the second kernel. On systems with many
devices this is not enough and causes device driver
initialization errors and failed crash dumps. Testing by
SUSE and Redhat has shown that 256MiB is a good default
value for now and the discussion has lead to this value as
well. So set this default value to 256MiB to make sure there
is enough memory available for DMA.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
[ Reflow comment. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jörg Rödel <joro@8bytes.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: kexec@lists.infradead.org
Link: http://lkml.kernel.org/r/1433500202-25531-4-git-send-email-joro@8bytes.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/kernel/setup.c