From: David Hildenbrand Date: Mon, 5 Jan 2026 20:08:50 +0000 (-0500) Subject: powerpc/pseries/cmm: call balloon_devinfo_init() also without CONFIG_BALLOON_COMPACTION X-Git-Tag: v5.10.248~74 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=01c1078b4f7841a344bf17aa94365387a3ec16ed;p=thirdparty%2Fkernel%2Fstable.git powerpc/pseries/cmm: call balloon_devinfo_init() also without CONFIG_BALLOON_COMPACTION [ Upstream commit fc6bcf9ac4de76f5e7bcd020b3c0a86faff3f2d5 ] Patch series "powerpc/pseries/cmm: two smaller fixes". Two smaller fixes identified while doing a bigger rework. This patch (of 2): We always have to initialize the balloon_dev_info, even when compaction is not configured in: otherwise the containing list and the lock are left uninitialized. Likely not many such configs exist in practice, but let's CC stable to be sure. This was found by code inspection. Link: https://lkml.kernel.org/r/20251021100606.148294-1-david@redhat.com Link: https://lkml.kernel.org/r/20251021100606.148294-2-david@redhat.com Fixes: fe030c9b85e6 ("powerpc/pseries/cmm: Implement balloon compaction") Signed-off-by: David Hildenbrand Reviewed-by: Ritesh Harjani (IBM) Cc: Christophe Leroy Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Signed-off-by: Andrew Morton [ moved balloon_devinfo_init() call from inside cmm_balloon_compaction_init() to cmm_init() ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/powerpc/platforms/pseries/cmm.c b/arch/powerpc/platforms/pseries/cmm.c index 45a3a3022a85c..6b38ccd63c908 100644 --- a/arch/powerpc/platforms/pseries/cmm.c +++ b/arch/powerpc/platforms/pseries/cmm.c @@ -570,7 +570,6 @@ static int cmm_balloon_compaction_init(void) { int rc; - balloon_devinfo_init(&b_dev_info); b_dev_info.migratepage = cmm_migratepage; balloon_mnt = kern_mount(&balloon_fs); @@ -624,6 +623,7 @@ static int cmm_init(void) if (!firmware_has_feature(FW_FEATURE_CMO) && !simulate) return -EOPNOTSUPP; + balloon_devinfo_init(&b_dev_info); rc = cmm_balloon_compaction_init(); if (rc) return rc;