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Groups > linux.kernel > #1338386
| From | Paolo Bonzini <pbonzini@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: Silence compiler warning in arch/x86/kvm/emulate.c |
| Date | 2016-02-19 19:00 +0100 |
| Message-ID | <r3Xvs-qi-3@gated-at.bofh.it> (permalink) |
| References | <q2Wkj-67e-27@gated-at.bofh.it> <r3RT5-4A8-47@gated-at.bofh.it> <r3WpJ-7Yk-41@gated-at.bofh.it> <r3Xvs-qi-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On 19/02/2016 18:54, Valdis.Kletnieks@vt.edu wrote: > la can get changed here - but there's 2 cases to consider. If it's > in a 32-bit kernel, anding with -1 is a no-op. > > Now if we're on a 64-bit kernel, the 'and' clears the high 32 > bits. > > But under what conditions is 'la' a 64-bit quantity that has any > bits set in the high 32 bits (meaning it's a pointer to something > over the 4G line) - but it's still valid to smash those bits? That can happen for example if there is a non-zero segment base. Then the linear address wraps at 4G. Paolo -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCAAGBQJWx1cxAAoJEL/70l94x66DFBcIAIkWZ7KaTyh3gfy5Cur7aukA 8NkEKvxZxO46lQAiKxf5ORTdBCdtZDjUjbxTVJoguITK/nnXuBLQIP/aeDhfHdhz BTYumgH+QV+kmZfn7mwgY5omS05Qx08DmdpQ1jyu1Y1aPVBv6FlsoWcHFrA+oXI2 wtit0OejbPJ9gT4dv1S/etuJvzdINQ/Y4fh/ulkyJJRIw5vvEgW+PN81UNCiSust w1zkljlfoU4he54IWHa0R1Am/uQBmWRuhvzaMZVKdkGlrN/jJo4ObR5DX+qPujPB sGSw2HTh8p4IuLwAJ0PvZZPNag+6vdOv9jxJuFpRNQGZLYY5eHL1IFVHaESv0vQ= =ssTD -----END PGP SIGNATURE-----
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Re: Silence compiler warning in arch/x86/kvm/emulate.c Aurelien Jarno <aurelien@aurel32.net> - 2016-02-19 13:00 +0100
Re: Silence compiler warning in arch/x86/kvm/emulate.c Paolo Bonzini <pbonzini@redhat.com> - 2016-02-19 13:10 +0100
Re: Silence compiler warning in arch/x86/kvm/emulate.c Aurelien Jarno <aurelien@aurel32.net> - 2016-02-19 18:10 +0100
Re: Silence compiler warning in arch/x86/kvm/emulate.c Aurelien Jarno <aurelien@aurel32.net> - 2016-02-19 17:50 +0100
Re: Silence compiler warning in arch/x86/kvm/emulate.c Valdis.Kletnieks@vt.edu - 2016-02-19 19:00 +0100
Re: Silence compiler warning in arch/x86/kvm/emulate.c Paolo Bonzini <pbonzini@redhat.com> - 2016-02-19 19:00 +0100
Re: Silence compiler warning in arch/x86/kvm/emulate.c Valdis.Kletnieks@vt.edu - 2016-02-20 01:40 +0100
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