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2024-03-05crash_core: export vmemmap when CONFIG_SPARSEMEM_VMEMMAP is enabledHuang Shijie1-0/+3
In memory_model.h, if CONFIG_SPARSEMEM_VMEMMAP is configed, kernel will use vmemmap to do the __pfn_to_page/page_to_pfn, and kernel will not use the "classic sparse" to do the __pfn_to_page/page_to_pfn. So export the vmemmap when CONFIG_SPARSEMEM_VMEMMAP is configed. This makes the user applications (crash, etc) get faster pfn_to_page/page_to_pfn operations too. Link: https://lkml.kernel.org/r/20240227014952.3184-1-shijie@os.amperecomputing.com Signed-off-by: Huang Shijie <shijie@os.amperecomputing.com> Acked-by: Baoquan He <bhe@redhat.com> Cc: Dave Young <dyoung@redhat.com> Cc: Kazuhito Hagio <k-hagio-ab@nec.com> Cc: Lianbo Jiang <lijiang@redhat.com> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-02-24crash: split vmcoreinfo exporting code out from crash_core.cBaoquan He1-0/+230
Now move the relevant codes into separate files: kernel/crash_reserve.c, include/linux/crash_reserve.h. And add config item CRASH_RESERVE to control its enabling. And also update the old ifdeffery of CONFIG_CRASH_CORE, including of <linux/crash_core.h> and config item dependency on CRASH_CORE accordingly. And also do renaming as follows: - arch/xxx/kernel/{crash_core.c => vmcore_info.c} because they are only related to vmcoreinfo exporting on x86, arm64, riscv. And also Remove config item CRASH_CORE, and rely on CONFIG_KEXEC_CORE to decide if build in crash_core.c. [yang.lee@linux.alibaba.com: remove duplicated include in vmcore_info.c] Link: https://lkml.kernel.org/r/20240126005744.16561-1-yang.lee@linux.alibaba.com Link: https://lkml.kernel.org/r/20240124051254.67105-3-bhe@redhat.com Signed-off-by: Baoquan He <bhe@redhat.com> Signed-off-by: Yang Li <yang.lee@linux.alibaba.com> Acked-by: Hari Bathini <hbathini@linux.ibm.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Pingfan Liu <piliu@redhat.com> Cc: Klara Modin <klarasmodin@gmail.com> Cc: Michael Kelley <mhklinux@outlook.com> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Yang Li <yang.lee@linux.alibaba.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>