fs: sysfs_emit_at: Remove PAGE_SIZE alignment check

From: Eric Biggers <ebiggers@google.com>

[No upstream commit because this fixes a bug in a backport.]

Before upstream commit 59bb47985c1d ("mm, sl[aou]b: guarantee natural
alignment for kmalloc(power-of-two)") which went into v5.4, kmalloc did
*not* always guarantee that PAGE_SIZE allocations are PAGE_SIZE-aligned.

Upstream commit 2efc459d06f1 ("sysfs: Add sysfs_emit and sysfs_emit_at
to format sysfs output") added two WARN()s that trigger when PAGE_SIZE
allocations are not PAGE_SIZE-aligned.  This was backported to old
kernels that don't guarantee PAGE_SIZE alignment.

Commit 10ddfb49 ("fs: sysfs_emit: Remove PAGE_SIZE alignment check")
in 4.19.y, and its equivalent in 4.14.y and 4.9.y, tried to fix this
bug.  However, only it handled sysfs_emit(), not sysfs_emit_at().

Fix it in sysfs_emit_at() too.

A reproducer is to build the kernel with the following options:

	CONFIG_SLUB=y
	CONFIG_SLUB_DEBUG=y
	CONFIG_SLUB_DEBUG_ON=y
	CONFIG_PM=y
	CONFIG_SUSPEND=y
	CONFIG_PM_WAKELOCKS=y

Then run:

	echo foo > /sys/power/wake_lock && cat /sys/power/wake_lock

Fixes: cb1f69d5 ("sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs output")
Reported-by: kernel test robot <yujie.liu@intel.com>
Link: https://lore.kernel.org/r/202303141634.1e64fd76-yujie.liu@intel.com


Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>