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ce27374fab
I'm about to rewrite the function almost completely, but first I want to get a functional change out of the way. Currently, if flush_tlb_mm_range() does not flush the local TLB at all, it will never do individual page flushes on remote CPUs. This seems to be an accident, and preserving it will be awkward. Let's change it first so that any regressions in the rewrite will be easier to bisect and so that the rewrite can attempt to change no visible behavior at all. The fix is simple: we can simply avoid short-circuiting the calculation of base_pages_to_flush. As a side effect, this also eliminates a potential corner case: if tlb_single_page_flush_ceiling == TLB_FLUSH_ALL, flush_tlb_mm_range() could have ended up flushing the entire address space one page at a time. Signed-off-by: Andy Lutomirski <luto@kernel.org> Acked-by: Dave Hansen <dave.hansen@intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Nadav Amit <namit@vmware.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/4b29b771d9975aad7154c314534fec235618175a.1492844372.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.