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[Qemu-trivial] [PATCH] block/nvme: Remove QEMU_PACKED from naturally ali

From: Thomas Huth
Subject: [Qemu-trivial] [PATCH] block/nvme: Remove QEMU_PACKED from naturally aligned NVMeRegs struct
Date: Mon, 25 Feb 2019 12:59:30 +0100

The QEMU_PACKED is causing a compiler warning/error with GCC 9:

  CC      block/nvme.o
block/nvme.c: In function ‘nvme_create_queue_pair’:
block/nvme.c:209:22: error: taking address of packed member of
 ‘struct <anonymous>’ may result in an unaligned pointer value
  209 |     q->sq.doorbell = &s->regs->doorbells[idx * 2 * s->doorbell_scale];

All members of the struct are naturally aligned, so there should
not be the need for QEMU_PACKED here, and the following QEMU_BUILD_BUG_ON
also ensures that there is no padding. Thus simply remove the QEMU_PACKED

Buglink: https://bugs.launchpad.net/qemu/+bug/1817525
Reported-by: Satheesh Rajendran <address@hidden>
Signed-off-by: Thomas Huth <address@hidden>
 block/nvme.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/nvme.c b/block/nvme.c
index b5952c9..6c2ce7d 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -82,7 +82,7 @@ typedef volatile struct {
     uint8_t  reserved1[0xec0];
     uint8_t  cmd_set_specfic[0x100];
     uint32_t doorbells[];
+} NVMeRegs;
 QEMU_BUILD_BUG_ON(offsetof(NVMeRegs, doorbells) != 0x1000);

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