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Mike Kravetz 6f4a489d84 hugetlb: fix huge_pmd_unshare address update 
commit 48381273f8 upstream.

The routine huge_pmd_unshare() is passed a pointer to an address
associated with an area which may be unshared.  If unshare is successful
this address is updated to 'optimize' callers iterating over huge page
addresses.  For the optimization to work correctly, address should be
updated to the last huge page in the unmapped/unshared area.  However, in
the common case where the passed address is PUD_SIZE aligned, the address
is incorrectly updated to the address of the preceding huge page.  That
wastes CPU cycles as the unmapped/unshared range is scanned twice.

Link: https://lkml.kernel.org/r/20220524205003.126184-1-mike.kravetz@oracle.com
Fixes: 39dde65c99 ("shared page table for hugetlb page")
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: Muchun Song <songmuchun@bytedance.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-06-14 18:11:48 +02:00
arch um: Fix out-of-bounds read in LDT setup 2022-06-14 18:11:48 +02:00
block bfq: Track whether bfq_group is still online 2022-06-14 18:11:45 +02:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-15 09:47:29 +02:00
crypto crypto: cryptd - Protect per-CPU resource by disabling BH. 2022-06-14 18:11:41 +02:00
Documentation hwmon: Make chip parameter for with_info API mandatory 2022-06-14 18:11:29 +02:00
drivers iommu/msm: Fix an incorrect NULL check on list iterator 2022-06-14 18:11:48 +02:00
fs ocfs2: dlmfs: fix error handling of user_dlm_destroy_lock 2022-06-14 18:11:46 +02:00
include nodemask.h: fix compilation error with GCC12 2022-06-14 18:11:48 +02:00
init Kconfig: Add option for asm goto w/ tied outputs to workaround clang-13 bug 2022-06-14 18:11:47 +02:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2022-06-14 18:11:41 +02:00
kernel tracing: Fix potential double free in create_var_ref() 2022-06-14 18:11:46 +02:00
lib assoc_array: Fix BUG_ON during garbage collect 2022-06-06 08:33:50 +02:00
LICENSES
mm hugetlb: fix huge_pmd_unshare address update 2022-06-14 18:11:48 +02:00
net mac80211: upgrade passive scan to active scan on DFS channels after beacon rx 2022-06-14 18:11:48 +02:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-17 09:48:39 +01:00
scripts scripts/faddr2line: Fix overlapping text section failures 2022-06-14 18:11:37 +02:00
security efi: Do not import certificates from UEFI Secure Boot for T2 Macs 2022-06-14 18:11:44 +02:00
sound ASoC: wm2000: fix missing clk_disable_unprepare() on error in wm2000_anc_transition() 2022-06-14 18:11:38 +02:00
tools perf jevents: Fix event syntax error caused by ExtSel 2022-06-14 18:11:44 +02:00
usr initramfs: restore default compression behavior 2020-04-08 09:08:38 +02:00
virt KVM: Prevent module exit until all VMs are freed 2022-04-15 14:18:27 +02:00
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MAINTAINERS Documentation/llvm: add documentation on building w/ Clang/LLVM 2020-08-26 10:40:46 +02:00
Makefile Linux 5.4.197 2022-06-06 08:33:51 +02:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.