+ powerpc-xive-remove-dead-null-check-after-gfp_nofail-allocation.patch added to mm-nonmm-unstable branch

+ powerpc-xive-remove-dead-null-check-after-gfp_nofail-allocation.patch added to mm-nonmm-unstable branch

[Andrew Morton]

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The patch titled
     Subject: powerpc/xive: remove dead NULL check after GFP_NOFAIL allocation
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     powerpc-xive-remove-dead-null-check-after-gfp_nofail-allocation.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/powerpc-xive-remove-dead-null-check-after-gfp_nofail-allocation.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Gou Hao <gouhao@uniontech.com>
Subject: powerpc/xive: remove dead NULL check after GFP_NOFAIL allocation
Date: Fri, 24 Jul 2026 10:28:46 +0800

Patch series "remove dead NULL checks after GFP_NOFAIL allocations and fix
xive use-after-free", v2.

This is a code cleanup series that removes unreachable NULL checks (and
associated error handling) that follow allocations using __GFP_NOFAIL,
which guarantees non-NULL return.


This patch (of 6):

kzalloc_objs with the __GFP_NOFAIL flag will never return NULL, so the
subsequent NULL check is unreachable dead code.  Remove it.

Link: https://lore.kernel.org/20260724022851.466017-1-gouhao@uniontech.com
Link: https://lore.kernel.org/20260724022851.466017-2-gouhao@uniontech.com
Signed-off-by: Gou Hao <gouhao@uniontech.com>
Reviewed-by: Wentao Guan <guanwentao@uniontech.com>
Reviewed-by: jiazhenyuan <jiazhenyuan@uniontech.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Cc: Bharat Potnuri <bharat@chelsio.com>
Cc: Dave Airlie <airlied@gmail.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nam Cao <namcao@linutronix.de>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Nilay Shroff <nilay@linux.ibm.com>
Cc: Shrikanth Hegde <sshegde@linux.ibm.com>
Cc: Thomas Zimemrmann <tzimmermann@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/powerpc/sysdev/xive/common.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/arch/powerpc/sysdev/xive/common.c~powerpc-xive-remove-dead-null-check-after-gfp_nofail-allocation
+++ a/arch/powerpc/sysdev/xive/common.c
@@ -1134,9 +1134,6 @@ static int __init xive_init_ipis(void)
 
 	xive_ipis = kzalloc_objs(*xive_ipis, nr_node_ids,
 				 GFP_KERNEL | __GFP_NOFAIL);
-	if (!xive_ipis)
-		goto out_free_domain;
-
 	for_each_node(node) {
 		struct xive_ipi_desc *xid = &xive_ipis[node];
 		struct xive_ipi_alloc_info info = { node };
@@ -1158,7 +1155,7 @@ static int __init xive_init_ipis(void)
 
 out_free_xive_ipis:
 	kfree(xive_ipis);
-out_free_domain:
+	xive_ipis = NULL;
 	irq_domain_remove(ipi_domain);
 out_free_fwnode:
 	irq_domain_free_fwnode(fwnode);
_

Patches currently in -mm which might be from gouhao@uniontech.com are

powerpc-xive-remove-dead-null-check-after-gfp_nofail-allocation.patch
powerpc-xive-add-error-return-value-to-xive_smp_probe.patch
powerpc-xive-fix-use-after-free-of-xive_ipis.patch
drm-remove-dead-warn_on-null-check-after-gfp_nofail-allocation.patch
lib-test_hmm-remove-dead-null-checks-after-gfp_nofail-allocations.patch
rdma-cxgb4-remove-dead-null-checks-after-gfp_nofail-allocations.patch