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Historically when freeing pages, free_one_page() assumed that callers had IRQs disabled and the zone->lock could be acquired with spin_lock(). This confuses the scope of what local_lock_irq is protecting and what zone->lock is protecting in free_unref_page_list in particular. This patch uses spin_lock_irqsave() for the zone->lock in free_one_page() instead of relying on callers to have disabled IRQs. free_unref_page_commit() is changed to only deal with PCP pages protected by the local lock. free_unref_page_list() then first frees isolated pages to the buddy lists with free_one_page() and frees the rest of the pages to the PCP via free_unref_page_commit(). The end result is that free_one_page() is no longer depending on side-effects of local_lock to be correct. Note that this may incur a performance penalty while memory hot-remove is running but that is not a common operation. [lkp@intel.com: Ensure CMA pages get addded to correct pcp list] Link: https://lkml.kernel.org/r/20210512095458.30632-9-mgorman@techsingularity.net Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Acked-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Chuck Lever <chuck.lever@oracle.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jesper Dangaard Brouer <brouer@redhat.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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arch | ||
block | ||
certs | ||
crypto | ||
Documentation | ||
drivers | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
LICENSES | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.clang-format | ||
.cocciconfig | ||
.get_maintainer.ignore | ||
.gitattributes | ||
.gitignore | ||
.mailmap | ||
COPYING | ||
CREDITS | ||
Kbuild | ||
Kconfig | ||
MAINTAINERS | ||
Makefile | ||
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.