selftests: uevent filtering: don't shrink the socket buffer

The uevent_filtering test shrinks the uevent socket buffer to 4 KB
although the default socket buffer size is much higher.  This leads to
this test being flaky when too many unrelated uevents are fired on the
machine.  They might fill up the netlink receive buffer leading to ENOBUFS
errors when trying to receive the uevents.  For example, I could trigger
test failures when running triggering a lot of udev events in the
background:

  $ # run multiple of that in the background:
  $ while :; do sudo udevadm trigger --action=change; done &
  $ sudo ./uevent_filtering
    # Starting 1 tests from 1 test cases.
    #  RUN           global.uevent_filtering ...
    add@/devices/virtual/mem/fullACTION=addDEVPATH=/devices/virtual/mem/fullSUBSYSTEM=memSYNTH_UUID=0MAJOR=1MINOR=7DEVNAME=fullDEVMODE=0666SEQNUM=304458
    add@/devices/virtual/mem/fullACTION=addDEVPATH=/devices/virtual/mem/fullSUBSYSTEM=memSYNTH_UUID=0MAJOR=1MINOR=7DEVNAME=fullDEVMODE=0666SEQNUM=304471
    add@/devices/virtual/mem/fullACTION=addDEVPATH=/devices/virtual/mem/fullSUBSYSTEM=memSYNTH_UUID=0MAJOR=1MINOR=7DEVNAME=fullDEVMODE=0666SEQNUM=304481
    add@/devices/virtual/mem/fullACTION=addDEVPATH=/devices/virtual/mem/fullSUBSYSTEM=memSYNTH_UUID=0MAJOR=1MINOR=7DEVNAME=fullDEVMODE=0666SEQNUM=349156
    No buffer space available - Failed to receive uevent
    # uevent_filtering.c:463:uevent_filtering:Expected 0 (0) == ret (-1)
    # uevent_filtering: Test failed
    #          FAIL  global.uevent_filtering
    not ok 1 global.uevent_filtering

The default receive buffer size (SK_RMEM_MAX) is far larger than the
requested 4 KB, so keep this to make the test less flaky.

Link: https://lore.kernel.org/20260619-get-swam-a1cd4cca@mheyne-amazon
Fixes: 9d3df886d17b ("selftests: uevent filtering")
Signed-off-by: Maximilian Heyne <mheyne@amazon.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Christian Brauner <christianvanbrauner@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: <stable@vger.kernel.org>

0 files changed, 0 insertions, 0 deletions