netdev - [PATCH net-next V1 0/3] Make is_kdump_kernel() accessible from modules

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Date:	Mon, 25 Aug 2014 16:06:51 +0300
From:	Amir Vadai <amirv@...lanox.com>
To:	"David S. Miller" <davem@...emloft.net>,
	Andi Kleen <andi@...stfloor.org>
Cc:	netdev@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Yevgeny Petrilin <yevgenyp@...lanox.com>,
	Amir Vadai <amirv@...lanox.com>
Subject: [PATCH net-next V1 0/3] Make is_kdump_kernel() accessible from modules

Hi,

I'm re-spinning this patchset. At the begining it was suggested to use a
different name for the parameter, but at the end [3] the resolution was to
leave it as it is in this patch.

Drivers need to know if running from kdump kernel in order to change their
memory profile - since kdump environment is limited by available memory.
Currently there are drivers that are using reset_devices as suggested in [2].
In [2] it was suggested to use reset_devices, but the context was, to enable
driver to know when the hardware device is needed to be reset, and not if this
is a kdump environment. We think that is_kdump_kernel() is better suited to
select between different memory profiles.

The first patch in this patchset exports a needed symbol in order to make
is_kdump_kernel() accessible from the drivers. The rest of the patches change
from reset_devices to is_kdump_kernel() in 2 networking drivers.

The idea of this patchset was suggested by Vivek Goyal.

Tested (only build) and applied on top of commit 8fc54f6: ("net: use
reciprocal_scale() helper")

[1] - ea1c1af: ("net/mlx4_en: Reduce memory consumption on kdump kernel")
[2] - https://lkml.org/lkml/2011/1/27/341
[3] - http://www.spinics.net/lists/netdev/msg291492.html

Thanks,
Amir

Amir Vadai (3):
  crash_dump: Make is_kdump_kernel() accessible from modules
  net/mlx4: Use is_kdump_kernel() to detect kdump kernel
  net/bnx2x: Use is_kdump_kernel() to detect kdump kernel

 drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c  | 3 ++-
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c | 3 ++-
 include/linux/mlx4/device.h                      | 3 ++-
 kernel/crash_dump.c                              | 1 +
 4 files changed, 7 insertions(+), 3 deletions(-)

-- 
1.8.3.4

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