Commit b144dc5a2414 for kernel

commit b144dc5a24149ba9a0cb2197001973a74b8c93b2
Author: Breno Leitao <leitao@debian.org>
Date:   Mon Aug 10 09:40:00 2026 -0700

    virtio_console: allocate the port_buffer with the caller's gfp

    put_chars() runs from the hvc console write path with preemption
    disabled, so it asks alloc_buf() for GFP_ATOMIC. Only the data buffer
    gets it: the struct port_buffer itself keeps the GFP_KERNEL default, so
    the allocation can enter direct reclaim and sleep. A write to /dev/kmsg
    on a CONFIG_DEBUG_ATOMIC_SLEEP kernel splats:

      BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:320
      in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 1, name: virtme-ng-init
      preempt_count: 1, expected: 0
      Preemption disabled at:
      [<ffffffff813fd90d>] vprintk_emit+0x17d/0x510
      Call Trace:
       <TASK>
       dump_stack_lvl+0x69/0xa0
       __might_resched+0x37a/0x4d0
       __kmalloc_cache_noprof+0x94/0x5f0
       put_chars+0x209/0x3e0
       hvc_console_print+0x234/0x640
       console_flush_all+0x4fc/0x950
       console_unlock+0xbf/0x1b0
       vprintk_emit+0x312/0x510
       devkmsg_emit+0xba/0x110
       devkmsg_write+0x21b/0x2e0
       vfs_write+0x4dc/0x9d0
       ksys_write+0x108/0x1e0
       do_syscall_64+0xfa/0x460
       </TASK>

    Pass gfp on to that allocation too.

    Fixes: fc220d6be3c7 ("virtio_console: refactor __send_to_port() buffer ownership")
    Signed-off-by: Breno Leitao <leitao@debian.org>
    Acked-by: Sungho Bae <baver.bae@lge.com>
    Tested-by: Florian Westphal <fw@strlen.de>
    Link: https://patch.msgid.link/20260810-serial-v1-1-abbe51602c13@debian.org
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 62eecfa61646..7f6cbe851d1e 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -426,7 +426,7 @@ static struct port_buffer *alloc_buf(struct virtio_device *vdev, size_t buf_size
 	 * Allocate buffer and the sg list. The sg list array is allocated
 	 * directly after the port_buffer struct.
 	 */
-	buf = kmalloc_flex(*buf, sg, pages);
+	buf = kmalloc_flex(*buf, sg, pages, gfp);
 	if (!buf)
 		goto fail;