[PATCH v3] storvsc: use small sg_tablesize on x86

From	Olaf Hering <olaf@aepfle.de>
Newsgroups	linux.kernel
Subject	[PATCH v3] storvsc: use small sg_tablesize on x86
Date	2016-06-09 18:30 +0200
Message-ID	<rIb0d-lr-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Reducing the sg_tablesize allows booting of 32bit kernels in VMs, after
commit be0cf6ca301c61458dc4aa1a37acf4f58d2ed3d6 ("scsi: storvsc: Set the
tablesize based on the information given by the host")

[    5.567138] hv_storvsc vmbus_1: adjusting sg_tablesize 0x800 -> 0x20

Signed-off-by: Olaf Hering <olaf@aepfle.de>
---

As requested, use CONFIG_<bitsize>. For some reason IS_ENABLED(64_BIT)
does not work.

 drivers/scsi/storvsc_drv.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 3ddcabb..ae42324 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1673,11 +1673,15 @@ static int storvsc_probe(struct hv_device *device,
 	/* max cmd length */
 	host->max_cmd_len = STORVSC_MAX_CMD_LEN;
 
+#ifdef CONFIG_64BIT
 	/*
 	 * set the table size based on the info we got
 	 * from the host.
 	 */
 	host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT);
+#else
+	host->sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT;
+#endif
 
 	/* Register the HBA and start the scsi bus scan */
 	ret = scsi_add_host(host, &device->device);

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[PATCH v3] storvsc: use small sg_tablesize on x86 Olaf Hering <olaf@aepfle.de> - 2016-06-09 18:30 +0200
  Re: [PATCH v3] storvsc: use small sg_tablesize on x86 James Bottomley <jejb@linux.vnet.ibm.com> - 2016-06-09 19:30 +0200
    Re: [PATCH v3] storvsc: use small sg_tablesize on x86 Olaf Hering <olaf@aepfle.de> - 2016-06-10 00:10 +0200

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