Merge tag 'mm-nonmm-stable-2025-05-31-15-28' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull non-MM updates from Andrew Morton:

 - "hung_task: extend blocking task stacktrace dump to semaphore" from
   Lance Yang enhances the hung task detector.

   The detector presently dumps the blocking tasks's stack when it is
   blocked on a mutex. Lance's series extends this to semaphores

 - "nilfs2: improve sanity checks in dirty state propagation" from
   Wentao Liang addresses a couple of minor flaws in nilfs2

 - "scripts/gdb: Fixes related to lx_per_cpu()" from Illia Ostapyshyn
   fixes a couple of issues in the gdb scripts

 - "Support kdump with LUKS encryption by reusing LUKS volume keys" from
   Coiby Xu addresses a usability problem with kdump.

   When the dump device is LUKS-encrypted, the kdump kernel may not have
   the keys to the encrypted filesystem. A full writeup of this is in
   the series [0/N] cover letter

 - "sysfs: add counters for lockups and stalls" from Max Kellermann adds
   /sys/kernel/hardlockup_count and /sys/kernel/hardlockup_count and
   /sys/kernel/rcu_stall_count

 - "fork: Page operation cleanups in the fork code" from Pasha Tatashin
   implements a number of code cleanups in fork.c

 - "scripts/gdb/symbols: determine KASLR offset on s390 during early
   boot" from Ilya Leoshkevich fixes some s390 issues in the gdb
   scripts

* tag 'mm-nonmm-stable-2025-05-31-15-28' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (67 commits)
  llist: make llist_add_batch() a static inline
  delayacct: remove redundant code and adjust indentation
  squashfs: add optional full compressed block caching
  crash_dump, nvme: select CONFIGFS_FS as built-in
  scripts/gdb/symbols: determine KASLR offset on s390 during early boot
  scripts/gdb/symbols: factor out pagination_off()
  scripts/gdb/symbols: factor out get_vmlinux()
  kernel/panic.c: format kernel-doc comments
  mailmap: update and consolidate Casey Connolly's name and email
  nilfs2: remove wbc->for_reclaim handling
  fork: define a local GFP_VMAP_STACK
  fork: check charging success before zeroing stack
  fork: clean-up naming of vm_stack/vm_struct variables in vmap stacks code
  fork: clean-up ifdef logic around stack allocation
  kernel/rcu/tree_stall: add /sys/kernel/rcu_stall_count
  kernel/watchdog: add /sys/kernel/{hard,soft}lockup_count
  x86/crash: make the page that stores the dm crypt keys inaccessible
  x86/crash: pass dm crypt keys to kdump kernel
  Revert "x86/mm: Remove unused __set_memory_prot()"
  crash_dump: retrieve dm crypt keys in kdump kernel
  ...

1 files changed, 7 insertions, 6 deletions

diff --git a/lib/errseq.c b/lib/errseq.c
index 93e9b94358dc..13a2581c5a87 100644
--- a/lib/errseq.c
+++ b/lib/errseq.c
@@ -34,11 +34,14 @@
  */
 
 /* The low bits are designated for error code (max of MAX_ERRNO) */
-#define ERRSEQ_SHIFT		ilog2(MAX_ERRNO + 1)
+#define ERRSEQ_SHIFT		(ilog2(MAX_ERRNO) + 1)
 
 /* This bit is used as a flag to indicate whether the value has been seen */
 #define ERRSEQ_SEEN		(1 << ERRSEQ_SHIFT)
 
+/* Leverage macro ERRSEQ_SEEN to define errno mask macro here */
+#define ERRNO_MASK		(ERRSEQ_SEEN - 1)
+
 /* The lowest bit of the counter */
 #define ERRSEQ_CTR_INC		(1 << (ERRSEQ_SHIFT + 1))
 
@@ -60,8 +63,6 @@ errseq_t errseq_set(errseq_t *eseq, int err)
 {
 	errseq_t cur, old;
 
-	/* MAX_ERRNO must be able to serve as a mask */
-	BUILD_BUG_ON_NOT_POWER_OF_2(MAX_ERRNO + 1);
 
 	/*
 	 * Ensure the error code actually fits where we want it to go. If it
@@ -79,7 +80,7 @@ errseq_t errseq_set(errseq_t *eseq, int err)
 		errseq_t new;
 
 		/* Clear out error bits and set new error */
-		new = (old & ~(MAX_ERRNO|ERRSEQ_SEEN)) | -err;
+		new = (old & ~(ERRNO_MASK | ERRSEQ_SEEN)) | -err;
 
 		/* Only increment if someone has looked at it */
 		if (old & ERRSEQ_SEEN)
@@ -148,7 +149,7 @@ int errseq_check(errseq_t *eseq, errseq_t since)
 
 	if (likely(cur == since))
 		return 0;
-	return -(cur & MAX_ERRNO);
+	return -(cur & ERRNO_MASK);
 }
 EXPORT_SYMBOL(errseq_check);
 
@@ -200,7 +201,7 @@ int errseq_check_and_advance(errseq_t *eseq, errseq_t *since)
 		if (new != old)
 			cmpxchg(eseq, old, new);
 		*since = new;
-		err = -(new & MAX_ERRNO);
+		err = -(new & ERRNO_MASK);
 	}
 	return err;
 }