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do_page_fault(), like other exceptions, is already covered by user_enter() and user_exit() when the exception triggers in userspace. As explained in:8c84014f3b("x86/entry: Remove exception_enter() from most trap handlers") exception_enter/exit() only remained to handle possible page fault from kernel mode while context tracking is in CONTEXT_USER mode, ie: on kernel entry before we manage to call user_exit(). The only known offender was do_fast_syscall_32() fetching EBP register from where vDSO stashed it. Meanwhile this got fixed in:9999c8c01f("x86/entry: Call enter_from_user_mode() with IRQs off") that moved enter_from_user_mode() before the call to get_user(). So we can safely remove it now. Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Jim Mattson <jmattson@google.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Sean Christopherson <sean.j.christopherson@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Cc: Wanpeng Li <wanpengli@tencent.com> Link: https://lkml.kernel.org/r/20191227163612.10039-2-frederic@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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.