linux-kernel - [PATCH] sgi-xpc: Use GFP_ATOMIC for kmalloc in atomic context.

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Message-Id: <20190805125625.24963-1-huangfq.daxian@gmail.com>
Date:   Mon,  5 Aug 2019 20:56:25 +0800
From:   Fuqian Huang <huangfq.daxian@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Cliff Whickman <cpw@....com>, Robin Holt <robinmholt@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        Fuqian Huang <huangfq.daxian@...il.com>
Subject: [PATCH] sgi-xpc: Use GFP_ATOMIC for kmalloc in atomic context.

xpc_send_activate_IRQ_uv is called from
 <-xpc_send_activate_IRQ_part_uv
 <-xpc_indicate_partition_disengaged_uv
  (xpc_arch_ops.indicate_partition_disengaged)
 <-xpc_die_deactivate
 <-xpc_system_die

xpc_system_die is registered by atomic_notifier_chain_register,
which indicates xpc_system_die may be called in atomic context.
So the kmalloc in xpc_send_activate_IRQ_uv may be in atomic context.

Use GFP_ATOMIC instead of GFP_KERNEL in kmalloc.

Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>
---
 drivers/misc/sgi-xp/xpc_uv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/sgi-xp/xpc_uv.c b/drivers/misc/sgi-xp/xpc_uv.c
index 0c6de97dd347..422341e3234b 100644
--- a/drivers/misc/sgi-xp/xpc_uv.c
+++ b/drivers/misc/sgi-xp/xpc_uv.c
@@ -694,7 +694,7 @@ xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size,
 		if (gru_mq_desc == NULL) {
 			gru_mq_desc = kmalloc(sizeof(struct
 					      gru_message_queue_desc),
-					      GFP_KERNEL);
+					      GFP_ATOMIC);
 			if (gru_mq_desc == NULL) {
 				ret = xpNoMemory;
 				goto done;
-- 
2.11.0