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c42af83c59
memblock_estimated_nr_free_pages() returns the difference between the total size of the "memory" memblock type and the "reserved" memblock type. The "soft-reserved" memory regions are added to the "reserved" memblock type, but not to the "memory" memblock type. Therefore, memblock_estimated_nr_free_pages() may return a smaller value than expected, or if it underflows, an extremely large value. /proc/sys/kernel/threads-max is determined by the value of memblock_estimated_nr_free_pages(). This issue was discovered on machines with CXL memory because kernel.threads-max was either smaller than expected or extremely large for the installed DRAM size. This fixes the issue by replacing memblock_reserved_size() with memblock_reserved_kern_size() that tells how much memory was reserved from the actual RAM. Suggested-by: Mike Rapoport <rppt@kernel.org> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Link: https://patch.msgid.link/20251111010010.7800-1-akinobu.mita@gmail.com Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
2763 lines
76 KiB
2763 lines
76 KiB