kernel/linux.git, branch v6.6.146

Linux 6.6.146

2026-07-29T15:48:29+00:00

Signed-off-by: Greg Kroah-Hartman

mm: refactor mm_access() to not return NULL

2026-07-29T15:48:29+00:00

[ Upstream commit cd3f8467afd470ccab0de2fbc7c76664af4a0bac ] mm_access() can return NULL if the mm is not found, but this is handled the same as an error in all callers, with some translating this into an -ESRCH error. Only proc_mem_open() returns NULL if no mm is found, however in this case it is clearer and makes more sense to explicitly handle the error. Additionally we take the opportunity to refactor the function to eliminate unnecessary nesting. Simplify things by simply returning -ESRCH if no mm is found - this both eliminates confusing use of the IS_ERR_OR_NULL() macro, and simplifies callers which would return -ESRCH by returning this error directly. [lorenzo.stoakes@oracle.com: prefer neater pointer error comparison] Link: https://lkml.kernel.org/r/2fae1834-749a-45e1-8594-5e5979cf7103@lucifer.local Link: https://lkml.kernel.org/r/20240924201023.193135-1-lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes Suggested-by: Arnd Bergmann Cc: Al Viro Signed-off-by: Andrew Morton Signed-off-by: Sasha Levin

Linux 6.6.145

2026-07-24T14:03:54+00:00

Link: https://lore.kernel.org/r/20260721152441.786066624@linuxfoundation.org Tested-by: Brett A C Sheffield Tested-by: Peter Schneider Tested-by: Francesco Dolcini Tested-by: Wentao Guan Tested-by: Ron Economos Tested-by: Shuah Khan Tested-by: Pavel Machek (CIP) Link: https://lore.kernel.org/r/20260722143258.264584003@linuxfoundation.org Tested-by: Brett A C Sheffield Tested-by: Florian Fainelli Tested-by: Pavel Machek (CIP) Tested-by: Shung-Hsi Yu Tested-by: Miguel Ojeda Tested-by: Wentao Guan Tested-by: Peter Schneider Signed-off-by: Greg Kroah-Hartman

selftests/bpf: Add simple strscpy() implementation

2026-07-24T14:03:54+00:00

commit 63c49efc987afefc6b9bb7de083eb8748e0b1789 upstream. Replace bpf_strlcpy() in bpf_util.h with a sized_strscpy(), which is a simplified sized_strscpy() from the kernel (lib/string.c [1]). It: * takes a count (destination size) parameter * guarantees NULL-termination * returns the number of characters copied or -E2BIG Re-define strscpy macro similar to in-kernel implementation [2]: allow the count parameter to be optional. Add #ifdef-s to tools/include/linux/args.h, as they may be defined in other system headers (for example, __CONCAT in sys/cdefs.h). Fixup the single existing bpf_strlcpy() call in cgroup_helpers.c [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/lib/string.c?h=v6.19#n113 [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/string.h?h=v6.19#n91 Signed-off-by: Ihor Solodrai Link: https://lore.kernel.org/r/20260223190736.649171-2-ihor.solodrai@linux.dev Signed-off-by: Alexei Starovoitov Stable-dep-of: 55ffbe8a15b1 ("selftests/bpf: Initialize operation name before use") Signed-off-by: Shung-Hsi Yu Signed-off-by: Greg Kroah-Hartman

tools/testing: add linux/args.h header and fix radix, VMA tests

2026-07-24T14:03:53+00:00

commit 9a6a6a3191574a01dcf7a7d9385246d7bc8736bc upstream. Commit 857d18f23ab1 ("cleanup: Introduce ACQUIRE() and ACQUIRE_ERR() for conditional locks") accidentally broke the radix tree, VMA userland tests by including linux/args.h which is not present in the tools/include directory. This patch copies this over and adds an #ifdef block to avoid duplicate __CONCAT declaration in conflict with system headers when we ultimately include this. Link: https://lkml.kernel.org/r/20250811052654.33286-1-lorenzo.stoakes@oracle.com Fixes: 857d18f23ab1 ("cleanup: Introduce ACQUIRE() and ACQUIRE_ERR() for conditional locks") Signed-off-by: Lorenzo Stoakes Cc: Jann Horn Cc: John Hubbard Cc: Liam Howlett Cc: Sidhartha Kumar Cc: Vlastimil Babka Cc: Dan Williams Cc: Peter Zijlstra Signed-off-by: Andrew Morton Stable-dep-of: 63c49efc987a ("selftests/bpf: Add simple strscpy() implementation") [shung-hsi.yu: tools/testing/shared/linux/idr.h was tools/testing/radix-tree/linux/idr.h before commit 579d8dab47 ("tools: separate out shared radix-tree components"). ] Signed-off-by: Shung-Hsi Yu Signed-off-by: Greg Kroah-Hartman

driver core: Guard deferred probe timeout extension with delayed_work_pending()

2026-07-24T14:03:53+00:00

commit 557495bc879013c3d5e21d667e987e7ce3a514de upstream. mod_delayed_work() unconditionally queues the work even when it wasn't previously pending, which can fire the timeout prematurely or restart it after it already fired. Add a delayed_work_pending() guard to restore the originally intended semantics. Premature firing calls fw_devlink_drivers_done() before all built-in drivers have registered, causing fw_devlink to prematurely relax device links for suppliers whose drivers haven't loaded yet. Fixes: 1137838865bf ("driver core: Use mod_delayed_work to prevent lost deferred probe work") Tested-by: Geert Uytterhoeven Reviewed-by: Greg Kroah-Hartman Link: https://patch.msgid.link/20260525012340.3860581-2-dakr@kernel.org Signed-off-by: Danilo Krummrich Signed-off-by: Greg Kroah-Hartman

driver core: Fix missing jiffies conversion in deferred_probe_extend_timeout()

2026-07-24T14:03:53+00:00

commit f9e6da99fe49277979798a1c3b9790ae10aaa18a upstream. mod_delayed_work() takes jiffies, not seconds. Thus, restore the dropped conversion. While at it, fix incorrect indentation. Fixes: 1137838865bf ("driver core: Use mod_delayed_work to prevent lost deferred probe work") Tested-by: Biju Das Tested-by: Geert Uytterhoeven Reviewed-by: Greg Kroah-Hartman Link: https://patch.msgid.link/20260525012340.3860581-1-dakr@kernel.org Signed-off-by: Danilo Krummrich Signed-off-by: Greg Kroah-Hartman

jiffies: Cast to unsigned long in secs_to_jiffies() conversion

2026-07-24T14:03:53+00:00

commit bb2784d9ab49587ba4fbff37a319fff2924db289 upstream. While converting users of msecs_to_jiffies(), lkp reported that some range checks would always be true because of the mismatch between the implied int value of secs_to_jiffies() vs the unsigned long return value of the msecs_to_jiffies() calls it was replacing. Fix this by casting the secs_to_jiffies() input value to unsigned long. Fixes: b35108a51cf7ba ("jiffies: Define secs_to_jiffies()") Reported-by: kernel test robot Signed-off-by: Easwar Hariharan Signed-off-by: Thomas Gleixner Cc: stable@vger.kernel.org Link: https://lore.kernel.org/all/20250130192701.99626-1-eahariha@linux.microsoft.com Closes: https://lore.kernel.org/oe-kbuild-all/202501301334.NB6NszQR-lkp@intel.com/ Signed-off-by: Greg Kroah-Hartman

jiffies: Define secs_to_jiffies()

2026-07-24T14:03:53+00:00

commit b35108a51cf7bab58d7eace1267d7965978bcdb8 upstream. secs_to_jiffies() is defined in hci_event.c and cannot be reused by other call sites. Hoist it into the core code to allow conversion of the ~1150 usages of msecs_to_jiffies() that either: - use a multiplier value of 1000 or equivalently MSEC_PER_SEC, or - have timeouts that are denominated in seconds (i.e. end in 000) It's implemented as a macro to allow usage in static initializers. This will also allow conversion of yet more sites that use (sec * HZ) directly, and improve their readability. Suggested-by: Michael Kelley Signed-off-by: Easwar Hariharan Signed-off-by: Thomas Gleixner Reviewed-by: Luiz Augusto von Dentz Link: https://lore.kernel.org/all/20241030-open-coded-timeouts-v3-1-9ba123facf88@linux.microsoft.com Signed-off-by: Greg Kroah-Hartman

writeback: drop now-unnecessary rcu_barrier() in cgroup_writeback_umount()

2026-07-24T14:03:53+00:00

commit e90a6d668e26e00a72df2d09c173b563468f09c9 upstream. Commit e1b849cfa6b6 ("writeback: Avoid contention on wb->list_lock when switching inodes") replaced the queue_rcu_work() based scheduling of inode wb switches with a plain queue_work(). Since then no switcher goes through call_rcu(), so rcu_barrier() in cgroup_writeback_umount() has no callbacks of its own to wait for. It still drains unrelated call_rcu() callbacks from other subsystems on busy systems, which incidentally slows umount down; drop it. Fixes: e1b849cfa6b6 ("writeback: Avoid contention on wb->list_lock when switching inodes") Reviewed-by: Jan Kara Signed-off-by: Baokun Li Link: https://patch.msgid.link/20260521095016.2791354-3-libaokun@linux.alibaba.com Acked-by: Tejun Heo Signed-off-by: Christian Brauner (Amutable) Signed-off-by: Greg Kroah-Hartman